Copilot commented on code in PR #102:
URL: https://github.com/apache/maven-shared-io/pull/102#discussion_r3695504694


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src/test/java/org/apache/maven/shared/io/scan/StaleResourceScannerTest.java:
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@@ -0,0 +1,42 @@
+/*
+ * 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.shared.io.scan;
+
+import java.io.File;
+import java.util.Set;
+
+import org.apache.maven.shared.io.scan.mapping.SourceMapping;
+import org.junit.jupiter.api.Test;
+
+class StaleResourceScannerTest {
+
+    @Test
+    void shouldNotNpeWhenGetTargetFilesReturnsNull() throws Exception {
+        StaleResourceScanner scanner = new StaleResourceScanner();
+        scanner.addSourceMapping(new SourceMapping() {
+            public Set<File> getTargetFiles(File targetDir, String source) {
+                return null;
+            }
+        });
+
+        File sourceDir = new File("src/test");
+        File targetDir = new File("target");
+        scanner.getIncludedSources(sourceDir, targetDir);
+    }

Review Comment:
   This test relies on scanning the repository’s real `src/test` tree. That 
makes the test slower and less isolated (it depends on the working directory 
contents) and it doesn’t guarantee a minimal, deterministic set of included 
sources. Consider creating a temporary source directory under `target/` with a 
single file to ensure `getTargetFiles()` is exercised in a controlled way, and 
assert explicitly that the call does not throw.



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