gnodet-bot commented on code in PR #1160:
URL: 
https://github.com/apache/maven-compiler-plugin/pull/1160#discussion_r4232429823


##########
src/test/java/org/apache/maven/plugin/compiler/DiagnosticLoggerTest.java:
##########
@@ -0,0 +1,124 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.plugin.compiler;
+
+import javax.tools.Diagnostic;
+import javax.tools.JavaFileObject;
+
+import java.util.List;
+import java.util.Locale;
+
+import org.apache.maven.api.plugin.Log;
+import org.apache.maven.impl.DefaultMessageBuilderFactory;
+import org.junit.jupiter.api.Test;
+
+import static org.mockito.ArgumentMatchers.argThat;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.nullable;
+import static org.mockito.ArgumentMatchers.same;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+class DiagnosticLoggerTest {
+    @Test
+    void fallsBackToKindAndCodeWhenDiagnosticMessageCannotBeFormatted() {
+        var logger = mock(Log.class);
+        @SuppressWarnings("unchecked")
+        Diagnostic<JavaFileObject> diagnostic = mock(Diagnostic.class);
+        when(diagnostic.getMessage(nullable(Locale.class))).thenThrow(new 
RuntimeException("missing type"));
+        when(diagnostic.getKind()).thenReturn(Diagnostic.Kind.WARNING);
+        when(diagnostic.getSource()).thenReturn(null);
+        when(diagnostic.getLineNumber()).thenReturn(Diagnostic.NOPOS);
+        when(diagnostic.getColumnNumber()).thenReturn(Diagnostic.NOPOS);
+        
when(diagnostic.getCode()).thenReturn("compiler.warn.has.been.deprecated");
+
+        var listener = new DiagnosticLogger(logger, new 
DefaultMessageBuilderFactory(), null, null);
+        listener.report(diagnostic);
+
+        verify(logger).warn((String)
+                argThat(message -> ((String) message).contains("WARNING: 
compiler.warn.has.been.deprecated")));
+    }
+
+    @Test
+    void fallsBackToKindAndCodeWhenDiagnosticStringCannotBeFormatted() {
+        var logger = mock(Log.class);
+        @SuppressWarnings("unchecked")
+        Diagnostic<JavaFileObject> diagnostic = mock(Diagnostic.class);
+        when(diagnostic.getMessage(nullable(Locale.class))).thenThrow(new 
RuntimeException("missing type"));
+        when(diagnostic.getKind()).thenReturn(Diagnostic.Kind.WARNING);
+        when(diagnostic.getSource()).thenReturn(null);
+        when(diagnostic.getLineNumber()).thenReturn(Diagnostic.NOPOS);
+        when(diagnostic.getColumnNumber()).thenReturn(Diagnostic.NOPOS);
+        
when(diagnostic.getCode()).thenReturn("compiler.warn.has.been.deprecated");
+
+        var listener = new DiagnosticLogger(logger, new 
DefaultMessageBuilderFactory(), null, null);

Review Comment:
   ⚠️ **Duplicate test — 
`fallsBackToKindAndCodeWhenDiagnosticStringCannotBeFormatted` is now identical 
to `fallsBackToKindAndCodeWhenDiagnosticMessageCannotBeFormatted`**
   
   Both methods used to differ by the `toString()` mock: the first stubbed 
`toString()` to return a string, the second stubbed it to throw. Removing both 
stubs collapsed them into identical setups and identical assertions — they now 
exercise exactly the same code path.
   
   The second test should be updated to cover the scenario it was originally 
designed for: when `diagnostic.toString()` also throws. Since the production 
code no longer calls `toString()` at all (it goes straight to `getKind() + 
code`), this test is now redundant. Either remove it or make it explicitly 
verify that no `toString()` call is made (e.g. using a strict mock or 
`verify(diagnostic, never()).toString()`).



##########
src/it/MCOMPILER-1150/verify.groovy:
##########
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+def buildLog = new File(basedir, 'build.log')
+assert buildLog.isFile() : 'Expected the Maven Invoker build log'
+assert buildLog.text.contains('Cannot format compiler diagnostic; falling back 
to its string representation.') : 'Expected the diagnostic-formatting fallback 
to run'

Review Comment:
   🐛 **Bug: stale log message — IT will always fail**
   
   This assertion checks for the old log message `'falling back to its string 
representation.'`, but `DiagnosticLogger.java` was updated (in commit 87ac535) 
to emit `'falling back to its kind and code.'` instead.
   
   The integration test will fail whenever the fallback path is exercised on 
JDK 25+.
   
   ```suggestion
   assert buildLog.text.contains('Cannot format compiler diagnostic; falling 
back to its kind and code.') : 'Expected the diagnostic-formatting fallback to 
run'
   ```



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