tests: allow for externally supplied VPP workers config for tests

Allow to supply the external VPP worker config for tests which
do not specify the workers config explicitly, and use
the tags infra to flag those that need attention in this configuration.
This commit shows one example use of such a tag, there will be
a separate commit with the rest of the places needing it,
since that change is rather mechanical.

Thus, the assumption is that the test should by default be agnostic
of the VPP configuration, unless it explicitly specifies so.

Type: test
Change-Id: I3c0077e4e22a75cb9561fb98d3b783b93486b2be
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

src/plugins/acl/test/test_acl_plugin.py

@@ -11,6 +11,7 @@ from scapy.layers.inet import IP, TCP, UDP, ICMP
 from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest
 from scapy.layers.inet6 import IPv6ExtHdrFragment
 from framework import VppTestCase, VppTestRunner
+from framework import tag_fixme_vpp_workers
 from util import Host, ppp
 from ipaddress import IPv4Network, IPv6Network
 
@@ -19,6 +20,7 @@ from vpp_acl import AclRule, VppAcl, VppAclInterface, VppEtypeWhitelist
 from vpp_ip import INVALID_INDEX
 
 
+@tag_fixme_vpp_workers
 class TestACLplugin(VppTestCase):
     """ ACL plugin Test Case """
 

test/framework.py

@@ -257,7 +257,11 @@ class KeepAliveReporter(object):
 
 
 class TestCaseTag(Enum):
+    # marks the suites that must run at the end
+    # using only a single test runner
     RUN_SOLO = 1
+    # marks the suites broken on VPP multi-worker
+    FIXME_VPP_WORKERS = 2
 
 
 def create_tag_decorator(e):
@@ -269,7 +273,9 @@ def create_tag_decorator(e):
         return cls
     return decorator
 
+
 tag_run_solo = create_tag_decorator(TestCaseTag.RUN_SOLO)
+tag_fixme_vpp_workers = create_tag_decorator(TestCaseTag.FIXME_VPP_WORKERS)
 
 
 class VppTestCase(unittest.TestCase):
@@ -398,7 +404,10 @@ class VppTestCase(unittest.TestCase):
 
         cpu_core_number = cls.get_least_used_cpu()
         if not hasattr(cls, "worker_config"):
-            cls.worker_config = ""
+            cls.worker_config = os.getenv("VPP_WORKER_CONFIG", "")
+            if cls.worker_config != "":
+                if cls.has_tag(TestCaseTag.FIXME_VPP_WORKERS):
+                    cls.worker_config = ""
 
         default_variant = os.getenv("VARIANT")
         if default_variant is not None:
@@ -1435,6 +1444,13 @@ class VppTestResult(unittest.TestResult):
                 c = YELLOW
                 test_title_colored = colorize("SOLO RUN: " + test_title, c)
 
+            # This block may overwrite the colorized title above,
+            # but we want this to stand out and be fixed
+            if test.has_tag(TestCaseTag.FIXME_VPP_WORKERS):
+                c = RED
+                w = "FIXME with VPP workers: "
+                test_title_colored = colorize(w + test_title, c)
+
             if not hasattr(test.__class__, '_header_printed'):
                 print(double_line_delim)
                 print(test_title_colored)

test/test_util.py

@@ -14,6 +14,15 @@ class TestUtil (unittest.TestCase):
         """ if the test case class is timing-sensitive - return true """
         return False
 
+    @classmethod
+    def has_tag(cls, tag):
+        """ if the test case has a given tag - return true """
+        try:
+            return tag in cls.test_tags
+        except AttributeError:
+            pass
+        return False
+
     def test_mac_to_binary(self):
         """ MAC to binary and back """
         mac = 'aa:bb:cc:dd:ee:ff'