[Tests] Increase QMK test coverage (#13789)

* Add per-test keymaps

* Add better trace and info logs for failed unit-tests

* Add layer state assertion with tracing message

* Use individual test binaries configuration options

* Add basic qmk functionality tests

* Add tap hold configurations tests

* Add auto shift tests

* `qmk format-c

* Fix tests

Co-authored-by: Nick Brassel <nick@tzarc.org>

Makefile

@@ -378,11 +378,12 @@ define PARSE_ALL_KEYMAPS
 endef
 
 define BUILD_TEST
-    TEST_NAME := $1
+    TEST_PATH := $1
+    TEST_NAME := $$(notdir $$(TEST_PATH))
     MAKE_TARGET := $2
     COMMAND := $1
     MAKE_CMD := $$(MAKE) -r -R -C $(ROOT_DIR) -f build_test.mk $$(MAKE_TARGET)
-    MAKE_VARS := TEST=$$(TEST_NAME) FULL_TESTS="$$(FULL_TESTS)"
+    MAKE_VARS := TEST=$$(TEST_NAME) TEST_PATH=$$(TEST_PATH) FULL_TESTS="$$(FULL_TESTS)"
     MAKE_MSG := $$(MSG_MAKE_TEST)
     $$(eval $$(call BUILD))
     ifneq ($$(MAKE_TARGET),clean)
@@ -406,7 +407,7 @@ define PARSE_TEST
     ifeq ($$(TEST_NAME),all)
         MATCHED_TESTS := $$(TEST_LIST)
     else
-        MATCHED_TESTS := $$(foreach TEST,$$(TEST_LIST),$$(if $$(findstring $$(TEST_NAME),$$(TEST)),$$(TEST),))
+        MATCHED_TESTS := $$(foreach TEST, $$(TEST_LIST),$$(if $$(findstring $$(TEST_NAME), $$(notdir $$(TEST))), $$(TEST),))
     endif
     $$(foreach TEST,$$(MATCHED_TESTS),$$(eval $$(call BUILD_TEST,$$(TEST),$$(TEST_TARGET))))
 endef

build_full_test.mk

@@ -13,21 +13,24 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-#include $(TMK_PATH)/protocol.mk
+$(TEST)_INC := \
+	tests\test_common\common_config.h
 
-TEST_PATH=tests/$(TEST)
-
-$(TEST)_SRC= \
-	$(TEST_PATH)/keymap.c \
+$(TEST)_SRC := \
 	$(TMK_COMMON_SRC) \
 	$(QUANTUM_SRC) \
 	$(SRC) \
+	tests/test_common/keymap.c \
 	tests/test_common/matrix.c \
 	tests/test_common/test_driver.cpp \
 	tests/test_common/keyboard_report_util.cpp \
-	tests/test_common/test_fixture.cpp
-$(TEST)_SRC += $(patsubst $(ROOTDIR)/%,%,$(wildcard $(TEST_PATH)/*.cpp))
+	tests/test_common/test_fixture.cpp \
+	tests/test_common/test_keymap_key.cpp \
+	tests/test_common/test_logger.cpp \
+	$(patsubst $(ROOTDIR)/%,%,$(wildcard $(TEST_PATH)/*.cpp))
 
-$(TEST)_DEFS=$(TMK_COMMON_DEFS) $(OPT_DEFS)
-$(TEST)_CONFIG=$(TEST_PATH)/config.h
-VPATH+=$(TOP_DIR)/tests/test_common
+$(TEST)_DEFS := $(TMK_COMMON_DEFS) $(OPT_DEFS)
+
+$(TEST)_CONFIG := $(TEST_PATH)/config.h
+
+VPATH += $(TOP_DIR)/tests/test_common

build_test.mk

@@ -16,14 +16,14 @@ TEST_OBJ = $(BUILD_DIR)/test_obj
 OUTPUTS := $(TEST_OBJ)/$(TEST) $(GTEST_OUTPUT)
 
 GTEST_INC := \
-	$(LIB_PATH)/googletest/googletest/include\
-	$(LIB_PATH)/googletest/googlemock/include\
+	$(LIB_PATH)/googletest/googletest/include \
+	$(LIB_PATH)/googletest/googlemock/include
 
-GTEST_INTERNAL_INC :=\
-	$(LIB_PATH)/googletest/googletest\
+GTEST_INTERNAL_INC := \
+	$(LIB_PATH)/googletest/googletest \
 	$(LIB_PATH)/googletest/googlemock
 
-$(GTEST_OUTPUT)_SRC :=\
+$(GTEST_OUTPUT)_SRC := \
 	googletest/src/gtest-all.cc\
 	googlemock/src/gmock-all.cc
 
@@ -33,9 +33,9 @@ $(GTEST_OUTPUT)_INC := $(GTEST_INC) $(GTEST_INTERNAL_INC)
 LDFLAGS += -lstdc++ -lpthread -shared-libgcc
 CREATE_MAP := no
 
-VPATH +=\
-	$(LIB_PATH)/googletest\
-	$(LIB_PATH)/googlemock\
+VPATH += \
+	$(LIB_PATH)/googletest \
+	$(LIB_PATH)/googlemock \
 	$(LIB_PATH)/printf
 
 all: elf
@@ -49,7 +49,8 @@ CONSOLE_ENABLE = yes
 endif
 
 ifneq ($(filter $(FULL_TESTS),$(TEST)),)
-include tests/$(TEST)/rules.mk
+include tests/test_common/build.mk
+include $(TEST_PATH)/test.mk
 endif
 
 include common_features.mk

quantum/quantum_keycodes.h

@@ -558,40 +558,6 @@ enum quantum_keycodes {
     PROGRAMMABLE_BUTTON_31,
     PROGRAMMABLE_BUTTON_32,
 
-    // Dedicated macro keys for Configurator and VIA
-    MACRO_0,
-    MACRO_1,
-    MACRO_2,
-    MACRO_3,
-    MACRO_4,
-    MACRO_5,
-    MACRO_6,
-    MACRO_7,
-    MACRO_8,
-    MACRO_9,
-    MACRO_10,
-    MACRO_11,
-    MACRO_12,
-    MACRO_13,
-    MACRO_14,
-    MACRO_15,
-    MACRO_16,
-    MACRO_17,
-    MACRO_18,
-    MACRO_19,
-    MACRO_20,
-    MACRO_21,
-    MACRO_22,
-    MACRO_23,
-    MACRO_24,
-    MACRO_25,
-    MACRO_26,
-    MACRO_27,
-    MACRO_28,
-    MACRO_29,
-    MACRO_30,
-    MACRO_31,
-
     // Start of custom keycode range for keyboards and keymaps - always leave at the end
     SAFE_RANGE
 };

testlist.mk

@@ -1,5 +1,5 @@
-TEST_LIST = $(notdir $(patsubst %/rules.mk,%,$(wildcard $(ROOT_DIR)/tests/*/rules.mk)))
-FULL_TESTS := $(TEST_LIST)
+TEST_LIST = $(sort $(patsubst %/test.mk,%, $(shell find $(ROOT_DIR)tests -type f -name test.mk)))
+FULL_TESTS := $(notdir $(TEST_LIST))
 
 include $(QUANTUM_PATH)/debounce/tests/testlist.mk
 include $(QUANTUM_PATH)/encoder/tests/testlist.mk

tests/auto_shift/config.h

@@ -0,0 +1,19 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"

tests/auto_shift/test.mk

@@ -0,0 +1,20 @@
+# Copyright 2021 Stefan Kerkmann
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------
+
+AUTO_SHIFT_ENABLE = yes

tests/auto_shift/test_auto_shift.cpp

@@ -0,0 +1,73 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "action_tapping.h"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class AutoShift : public TestFixture {};
+
+TEST_F(AutoShift, key_release_before_timeout) {
+    TestDriver driver;
+    InSequence s;
+    auto       regular_key = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({regular_key});
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(AutoShift, key_release_after_timeout) {
+    TestDriver driver;
+    InSequence s;
+    auto       regular_key = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({regular_key});
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    idle_for(AUTO_SHIFT_TIMEOUT);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT, KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/basic/config.h

@@ -16,5 +16,4 @@
 
 #pragma once
 
-#define MATRIX_ROWS 4
-#define MATRIX_COLS 10
+#include "test_common.h"

tests/basic/keymap.c

@@ -1,45 +0,0 @@
-/* Copyright 2017 Fred Sundvik
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "quantum.h"
-
-// Don't rearrange keys as existing tests might rely on the order
-// Col2, Row 0 has to be KC_NO, because tests rely on it
-
-#define COMBO1 RSFT(LCTL(KC_O))
-
-const uint16_t PROGMEM
-               keymaps[][MATRIX_ROWS][MATRIX_COLS] =
-        {
-            [0] =
-                {
-                    // 0    1      2      3        4        5        6       7            8      9
-                    {KC_A, KC_B, KC_NO, KC_LSFT, KC_RSFT, KC_LCTL, COMBO1, SFT_T(KC_P), M(0), KC_NO},
-                    {KC_EQL, KC_PLUS, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO},
-                    {KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO},
-                    {KC_C, KC_D, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO},
-                },
-};
-
-const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt) {
-    if (record->event.pressed) {
-        switch (id) {
-            case 0:
-                return MACRO(D(LSFT), T(H), U(LSFT), T(E), T(L), T(L), T(O), T(SPACE), W(100), D(LSFT), T(W), U(LSFT), I(10), T(O), T(R), T(L), T(D), D(LSFT), T(1), U(LSFT), END);
-        }
-    }
-    return MACRO_NONE;
-};

tests/basic/test.mk

@@ -0,0 +1,18 @@
+# Copyright 2017 Fred Sundvik
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------

tests/basic/test_macro.cpp

@@ -24,10 +24,25 @@ class Macro : public TestFixture {};
 
 #define AT_TIME(t) WillOnce(InvokeWithoutArgs([current_time]() { EXPECT_EQ(timer_elapsed32(current_time), t); }))
 
+extern "C" const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt) {
+    if (record->event.pressed) {
+        switch (id) {
+            case 0:
+                return MACRO(D(LSFT), T(H), U(LSFT), T(E), T(L), T(L), T(O), T(SPACE), W(100), D(LSFT), T(W), U(LSFT), I(10), T(O), T(R), T(L), T(D), D(LSFT), T(1), U(LSFT), END);
+        }
+    }
+    return MACRO_NONE;
+};
+
 TEST_F(Macro, PlayASimpleMacro) {
     TestDriver driver;
     InSequence s;
-    press_key(8, 0);
+    auto       key_macro = KeymapKey(0, 8, 0, M(0));
+
+    set_keymap({key_macro});
+
+    key_macro.press();
+
     uint32_t current_time = timer_read32();
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LEFT_SHIFT))).AT_TIME(0);
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LEFT_SHIFT, KC_H))).AT_TIME(0);
@@ -68,4 +83,6 @@ TEST_F(Macro, PlayASimpleMacro) {
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LEFT_SHIFT))).AT_TIME(210);
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport())).AT_TIME(220);
     run_one_scan_loop();
+
+    key_macro.release();
 }

tests/basic/test_one_shot_keys.cpp

@@ -0,0 +1,197 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "action_util.h"
+#include "keyboard_report_util.hpp"
+#include "test_common.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class OneShot : public TestFixture {};
+class OneShotParametrizedTestFixture : public ::testing::WithParamInterface<std::pair<KeymapKey, KeymapKey>>, public OneShot {};
+
+TEST_F(OneShot, OSMWithoutAdditionalKeypressDoesNothing) {
+    TestDriver driver;
+    auto       osm_key = KeymapKey(0, 0, 0, OSM(MOD_LSFT), KC_LSFT);
+
+    set_keymap({osm_key});
+
+    /* Press and release OSM key*/
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osm_key.press();
+    run_one_scan_loop();
+    osm_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* OSM are added when an actual report is send */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(osm_key.report_code)));
+    send_keyboard_report();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Make unit-test pass */
+    clear_oneshot_mods();
+}
+
+#if defined(ONESHOT_TIMEOUT)
+
+TEST_P(OneShotParametrizedTestFixture, OSMExpiredDoesNothing) {
+    TestDriver driver;
+    KeymapKey  osm_key     = GetParam().first;
+    KeymapKey  regular_key = GetParam().second;
+
+    set_keymap({osm_key, regular_key});
+
+    /* Press and release OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osm_key.press();
+    run_one_scan_loop();
+    osm_key.release();
+    idle_for(ONESHOT_TIMEOUT);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(regular_key.report_code))).Times(1);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+#endif
+
+TEST_P(OneShotParametrizedTestFixture, OSMWithAdditionalKeypress) {
+    TestDriver driver;
+    KeymapKey  osm_key     = GetParam().first;
+    KeymapKey  regular_key = GetParam().second;
+
+    set_keymap({osm_key, regular_key});
+
+    /* Press and release OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osm_key.press();
+    run_one_scan_loop();
+    osm_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(osm_key.report_code, regular_key.report_code))).Times(1);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_P(OneShotParametrizedTestFixture, OSMAsRegularModifierWithAdditionalKeypress) {
+    TestDriver          driver;
+    testing::InSequence s;
+
+    KeymapKey osm_key     = GetParam().first;
+    KeymapKey regular_key = GetParam().second;
+
+    set_keymap({osm_key, regular_key});
+
+    /* Press OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osm_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(regular_key.report_code, osm_key.report_code))).Times(1);
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport())).Times(1);
+    osm_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// clang-format off
+
+INSTANTIATE_TEST_CASE_P(
+    OneShotModifierTests,
+    OneShotParametrizedTestFixture,
+    ::testing::Values(
+        /* first is osm key, second is regular key. */
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LSFT), KC_LSFT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LCTL), KC_LCTL}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LALT), KC_LALT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LGUI), KC_LGUI}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RCTL), KC_RCTL}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RSFT), KC_RSFT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RALT), KC_RALT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RGUI), KC_RGUI}, KeymapKey{0, 1, 1, KC_A})
+        ));
+// clang-format on
+
+TEST_F(OneShot, OSLWithAdditionalKeypress) {
+    TestDriver driver;
+    InSequence s;
+    KeymapKey  osl_key     = KeymapKey{0, 0, 0, OSL(1)};
+    KeymapKey  regular_key = KeymapKey{1, 1, 0, KC_A};
+
+    set_keymap({osl_key, regular_key});
+
+    /* Press OSL key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osl_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release OSL key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport())).Times(2);
+    osl_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(regular_key.report_code))).Times(2);
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/basic/test_tapping.cpp

@@ -14,8 +14,11 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
 #include "test_common.hpp"
 #include "action_tapping.h"
+#include "test_keymap_key.hpp"
 
 using testing::_;
 using testing::InSequence;
@@ -25,14 +28,19 @@ class Tapping : public TestFixture {};
 TEST_F(Tapping, TapA_SHFT_T_KeyReportsKey) {
     TestDriver driver;
     InSequence s;
+    auto       key_shift_hold_p_tap = KeymapKey(0, 7, 0, SFT_T(KC_P));
+
+    set_keymap({key_shift_hold_p_tap});
 
-    press_key(7, 0);
     // Tapping keys does nothing on press
+    key_shift_hold_p_tap.press();
     EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
     run_one_scan_loop();
-    release_key(7, 0);
+
     // First we get the key press
+    key_shift_hold_p_tap.release();
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+
     // Then the release
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
     run_one_scan_loop();
@@ -41,25 +49,38 @@ TEST_F(Tapping, TapA_SHFT_T_KeyReportsKey) {
 TEST_F(Tapping, HoldA_SHFT_T_KeyReportsShift) {
     TestDriver driver;
     InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 7, 0, SFT_T(KC_P));
+
+    set_keymap({mod_tap_hold_key});
+
+    mod_tap_hold_key.press();
 
-    press_key(7, 0);
     // Tapping keys does nothing on press
     EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
     idle_for(TAPPING_TERM);
+
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LEFT_SHIFT)));
     run_one_scan_loop();
+
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
 }
 
 TEST_F(Tapping, ANewTapWithinTappingTermIsBuggy) {
     // See issue #1478 for more information
     TestDriver driver;
     InSequence s;
+    auto       key_shift_hold_p_tap = KeymapKey(0, 7, 0, SFT_T(KC_P));
+
+    set_keymap({key_shift_hold_p_tap});
 
-    press_key(7, 0);
     // Tapping keys does nothing on press
+    key_shift_hold_p_tap.press();
     EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
     run_one_scan_loop();
-    release_key(7, 0);
+    key_shift_hold_p_tap.release();
+
     // First we get the key press
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
     // Then the release
@@ -67,19 +88,20 @@ TEST_F(Tapping, ANewTapWithinTappingTermIsBuggy) {
     run_one_scan_loop();
 
     // This sends KC_P, even if it should do nothing
-    press_key(7, 0);
+    key_shift_hold_p_tap.press();
     // This test should not succed if everything works correctly
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
     run_one_scan_loop();
-    release_key(7, 0);
+
+    key_shift_hold_p_tap.release();
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
     idle_for(TAPPING_TERM + 1);
 
     // On the other hand, nothing is sent if we are outside the tapping term
-    press_key(7, 0);
+    key_shift_hold_p_tap.press();
     EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
     run_one_scan_loop();
-    release_key(7, 0);
+    key_shift_hold_p_tap.release();
 
     // First we get the key press
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
@@ -90,8 +112,12 @@ TEST_F(Tapping, ANewTapWithinTappingTermIsBuggy) {
     // Now we are geting into strange territory, as the hold registers too early here
     // But the stranges part is:
     // If TAPPING_TERM + 1 above is changed to TAPPING_TERM or TAPPING_TERM + 2 it doesn't
-    press_key(7, 0);
+    key_shift_hold_p_tap.press();
     // Shouldn't be called here really
     EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LEFT_SHIFT))).Times(1);
     idle_for(TAPPING_TERM);
-}
+
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    key_shift_hold_p_tap.release();
+    run_one_scan_loop();
+}

tests/tap_hold_configurations/default_mod_tap/config.h

@@ -0,0 +1,21 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"
+
+#define IGNORE_MOD_TAP_INTERRUPT

tests/tap_hold_configurations/default_mod_tap/test.mk

@@ -0,0 +1,18 @@
+# Copyright 2021 Stefan Kerkmann
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------

tests/tap_hold_configurations/default_mod_tap/test_tap_hold.cpp

@@ -0,0 +1,230 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "action_tapping.h"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class DefaultTapHold : public TestFixture {};
+
+TEST_F(DefaultTapHold, tap_regular_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       regular_key      = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({mod_tap_hold_key, regular_key});
+
+    /* Press mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key. */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key. */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P, KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Idle for tapping term of mod tap hold key. */
+    idle_for(TAPPING_TERM - 3);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(DefaultTapHold, tap_mod_tap_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       first_mod_tap_hold_key  = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       second_mod_tap_hold_key = KeymapKey(0, 2, 0, RSFT_T(KC_A));
+
+    set_keymap({first_mod_tap_hold_key, second_mod_tap_hold_key});
+
+    /* Press first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    first_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P, KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    first_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(DefaultTapHold, tap_regular_key_while_layer_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       layer_tap_hold_key = KeymapKey(0, 1, 0, LT(1, KC_P));
+    auto       regular_key        = KeymapKey(0, 2, 0, KC_A);
+    auto       layer_key          = KeymapKey(1, 2, 0, KC_B);
+
+    set_keymap({layer_tap_hold_key, regular_key, layer_key});
+
+    /* Press layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    layer_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_A, KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(_));
+    layer_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(DefaultTapHold, tap_mod_tap_hold_key_two_times) {
+    GTEST_SKIP() << "TODO:Holding a modtap key results in out of bounds access to the keymap, this is a bug in QMK.";
+
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+
+    set_keymap({mod_tap_hold_key});
+
+    /* Press mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press mod-tap-hold key again. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    mod_tap_hold_key.press();
+    idle_for(TAPPING_TERM);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(DefaultTapHold, tap_mod_tap_hold_key_twice_and_hold_on_second_time) {
+    GTEST_SKIP() << "TODO:Holding a modtap key results in out of bounds access to the keymap, this is a bug in QMK.";
+
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+
+    set_keymap({mod_tap_hold_key});
+
+    /* Press mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press mod-tap-hold key again. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    mod_tap_hold_key.press();
+    idle_for(TAPPING_TERM);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(DefaultTapHold, tap_and_hold_mod_tap_hold_key) {
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+
+    set_keymap({mod_tap_hold_key});
+
+    /* Press mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT)));
+    mod_tap_hold_key.press();
+    idle_for(TAPPING_TERM + 1);
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key. */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/tap_hold_configurations/ignore_mod_tap_interrupt/config.h

@@ -0,0 +1,21 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"
+
+#define IGNORE_MOD_TAP_INTERRUPT

tests/tap_hold_configurations/ignore_mod_tap_interrupt/test.mk

@@ -0,0 +1,18 @@
+# Copyright 2021 Stefan Kerkmann
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------

tests/tap_hold_configurations/ignore_mod_tap_interrupt/test_tap_hold.cpp

@@ -0,0 +1,136 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "action_tapping.h"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class IgnoreModTapInterrupt : public TestFixture {};
+
+TEST_F(IgnoreModTapInterrupt, tap_regular_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       regular_key      = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({mod_tap_hold_key, regular_key});
+
+    /* Press mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_A, KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(IgnoreModTapInterrupt, tap_mod_tap_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       first_mod_tap_hold_key  = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       second_mod_tap_hold_key = KeymapKey(0, 2, 0, RSFT_T(KC_A));
+
+    set_keymap({first_mod_tap_hold_key, second_mod_tap_hold_key});
+
+    /* Press first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    first_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_A, KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    first_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(IgnoreModTapInterrupt, tap_regular_key_while_layer_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       layer_tap_hold_key = KeymapKey(0, 1, 0, LT(1, KC_P));
+    auto       regular_key        = KeymapKey(0, 2, 0, KC_A);
+    auto       layer_key          = KeymapKey(1, 2, 0, KC_B);
+
+    set_keymap({layer_tap_hold_key, regular_key, layer_key});
+
+    /* Press layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    layer_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P, regular_key.report_code)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_P)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    layer_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/tap_hold_configurations/permissive_hold/config.h

@@ -0,0 +1,21 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"
+
+#define PERMISSIVE_HOLD

tests/tap_hold_configurations/permissive_hold/test.mk

@@ -0,0 +1,18 @@
+# Copyright 2021 Stefan Kerkmann
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------

tests/tap_hold_configurations/permissive_hold/test_one_shot_keys.cpp

@@ -0,0 +1,76 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "action_util.h"
+#include "keyboard_report_util.hpp"
+#include "test_common.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class OneShot : public TestFixture {};
+class OneShotParametrizedTestFixture : public ::testing::WithParamInterface<std::pair<KeymapKey, KeymapKey>>, public OneShot {};
+
+TEST_P(OneShotParametrizedTestFixture, OSMAsRegularModifierWithAdditionalKeypress) {
+    TestDriver driver;
+    KeymapKey  osm_key     = GetParam().first;
+    KeymapKey  regular_key = GetParam().second;
+
+    set_keymap({osm_key, regular_key});
+
+    /* Press OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    osm_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(osm_key.report_code))).Times(2);
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(regular_key.report_code, osm_key.report_code))).Times(1);
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release OSM */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport())).Times(1);
+    osm_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// clang-format off
+
+INSTANTIATE_TEST_CASE_P(
+    OneShotModifierTests,
+    OneShotParametrizedTestFixture,
+    ::testing::Values(
+        /* first is osm key, second is regular key. */
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LSFT), KC_LSFT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LCTL), KC_LCTL}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LALT), KC_LALT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_LGUI), KC_LGUI}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RCTL), KC_RCTL}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RSFT), KC_RSFT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RALT), KC_RALT}, KeymapKey{0, 1, 1, KC_A}),
+        std::make_pair(KeymapKey{0, 0, 0, OSM(MOD_RGUI), KC_RGUI}, KeymapKey{0, 1, 1, KC_A})
+        ));
+// clang-format on

tests/tap_hold_configurations/permissive_hold/test_tap_hold.cpp

@@ -0,0 +1,132 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "action_tapping.h"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+using testing::_;
+using testing::InSequence;
+class PermissiveHold : public TestFixture {};
+
+TEST_F(PermissiveHold, tap_regular_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       regular_key      = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({mod_tap_hold_key, regular_key});
+
+    /* Press mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT, regular_key.report_code)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT)));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(PermissiveHold, tap_mod_tap_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       first_mod_tap_hold_key  = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       second_mod_tap_hold_key = KeymapKey(0, 2, 0, RSFT_T(KC_A));
+
+    set_keymap({first_mod_tap_hold_key, second_mod_tap_hold_key});
+
+    /* Press first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    first_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press second mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release second mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT, second_mod_tap_hold_key.report_code)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSHIFT)));
+    second_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    first_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(PermissiveHold, tap_regular_key_while_layer_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       layer_tap_hold_key = KeymapKey(0, 1, 0, LT(1, KC_P));
+    auto       regular_key        = KeymapKey(0, 2, 0, KC_A);
+    auto       layer_key          = KeymapKey(1, 2, 0, KC_B);
+
+    set_keymap({layer_tap_hold_key, regular_key, layer_key});
+
+    /* Press layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    layer_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(layer_key.report_code)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    layer_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/tap_hold_configurations/permissive_hold_ignore_mod_tap_interrupt/config.h

@@ -0,0 +1,22 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"
+
+#define IGNORE_MOD_TAP_INTERRUPT
+#define PERMISSIVE_HOLD

tests/tap_hold_configurations/permissive_hold_ignore_mod_tap_interrupt/test.mk

@@ -0,0 +1,18 @@
+# Copyright 2021 Stefan Kerkmann
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------

tests/tap_hold_configurations/permissive_hold_ignore_mod_tap_interrupt/test_tap_hold.cpp

@@ -0,0 +1,134 @@
+
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "action_tapping.h"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class PermissiveHold_IgnoreModTapInterrupt : public TestFixture {};
+
+TEST_F(PermissiveHold_IgnoreModTapInterrupt, tap_regular_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       mod_tap_hold_key = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       regular_key      = KeymapKey(0, 2, 0, KC_A);
+
+    set_keymap({mod_tap_hold_key, regular_key});
+
+    /* Press mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT, KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT)));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(PermissiveHold_IgnoreModTapInterrupt, tap_mod_tap_key_while_mod_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       first_mod_tap_hold_key  = KeymapKey(0, 1, 0, SFT_T(KC_P));
+    auto       second_mod_tap_hold_key = KeymapKey(0, 2, 0, RSFT_T(KC_A));
+
+    set_keymap({first_mod_tap_hold_key, second_mod_tap_hold_key});
+
+    /* Press first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    first_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    second_mod_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release second tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT, KC_A)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT)));
+    second_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release first mod-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    first_mod_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(PermissiveHold_IgnoreModTapInterrupt, tap_regular_key_while_layer_tap_key_is_held) {
+    TestDriver driver;
+    InSequence s;
+    auto       layer_tap_hold_key = KeymapKey(0, 1, 0, LT(1, KC_P));
+    auto       regular_key        = KeymapKey(0, 2, 0, KC_A);
+    auto       layer_key          = KeymapKey(1, 2, 0, KC_B);
+
+    set_keymap({layer_tap_hold_key, regular_key, layer_key});
+
+    /* Press layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    layer_tap_hold_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Press regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(_)).Times(0);
+    regular_key.press();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release regular key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_B)));
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    regular_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    /* Release layer-tap-hold key */
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport()));
+    layer_tap_hold_key.release();
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}

tests/tap_hold_configurations/retro_tapping/config.h

@@ -0,0 +1,21 @@
+/* Copyright 2021 Stefan Kerkmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "test_common.h"
+
+#define RETRO_TAPPING