diff --git a/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexCommentTest.java b/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexCommentTest.java
index 728cce6253..6e847170bf 100644
--- a/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexCommentTest.java
+++ b/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexCommentTest.java
@@ -66,4 +66,12 @@ class ApexCommentTest extends ApexParserTestBase {
         ASTFormalComment comment = file.descendants(ASTUserClass.class).children(ASTFormalComment.class).first();
         assertEquals(FORMAL_COMMENT_CONTENT, comment.getImage());
     }
+
+    @Test
+    void fileWithUnicodeEscapes() {
+        ASTApexFile file = apex.parse(FORMAL_COMMENT_CONTENT + "\n"
+                + "class MyClass { String s = 'Fran\\u00E7ois'; }");
+        ASTFormalComment comment = file.descendants(ASTUserClass.class).children(ASTFormalComment.class).first();
+        assertEquals(FORMAL_COMMENT_CONTENT, comment.getImage());
+    }
 }
diff --git a/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexLexerTest.java b/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexLexerTest.java
index b075160370..22104ac401 100644
--- a/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexLexerTest.java
+++ b/pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexLexerTest.java
@@ -57,6 +57,7 @@ class ApexLexerTest {
     @Test
     void testLexerUnicodeEscapes() {
         String s = "'Fran\\u00E7ois'";
+        // note: with apex-parser 4.3.1, no errors are reported anymore
         assertEquals(2, getLexingErrors(CharStreams.fromString(s)));
         assertEquals(0, getLexingErrors(new CaseInsensitiveInputStream(CharStreams.fromString(s))));
     }
@@ -71,7 +72,7 @@ class ApexLexerTest {
         return errorListener.getErrorCount();
     }
 
-    static class ErrorListener extends BaseErrorListener {
+    private static class ErrorListener extends BaseErrorListener {
         private int errorCount = 0;
 
         @Override