Adding a test to demo issue #18

2 files changed, 108 insertions, 7 deletions

diff --git a/api/src/main/java/org/osjava/jardiff/JarDiff.java b/api/src/main/java/org/osjava/jardiff/JarDiff.java
index 21eb333..6a55e87 100644
--- a/api/src/main/java/org/osjava/jardiff/JarDiff.java
+++ b/api/src/main/java/org/osjava/jardiff/JarDiff.java
@@ -46,10 +46,8 @@ import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.Enumeration;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
-import java.util.Set;
 import java.util.TreeSet;
 import java.util.TreeMap;
 import java.util.jar.JarEntry;
@@ -187,8 +185,8 @@ public class JarDiff
      * @param reader the ClassReader
      * @return the ClassInfo
      */
-    private synchronized ClassInfo loadClassInfo(ClassReader reader) 
-        throws IOException 
+    private synchronized ClassInfo loadClassInfo(ClassReader reader)
+        throws IOException
     {
         infoVisitor.reset();
         reader.accept(infoVisitor, false);
@@ -202,7 +200,7 @@ public class JarDiff
      * which contain classes in subdirectories or in the current directory.
      *
      * @param infoMap the map to store the ClassInfo in.
-     * @throws DiffException if there is an exception reading info about a 
+     * @throws DiffException if there is an exception reading info about a
      *                       class.
      */
     private void loadClasses(Map infoMap, URL path) throws DiffException {
@@ -241,7 +239,7 @@ public class JarDiff
      *
      * @param infoMap the map to store the ClassInfo in.
      * @param file the jarfile to load classes from.
-     * @throws IOException if there is an IOException reading info about a 
+     * @throws IOException if there is an IOException reading info about a
      *                     class.
      */
     private void loadClasses(Map infoMap, File file) throws DiffException {
@@ -313,7 +311,14 @@ public class JarDiff
      *                       writing to a file caused an IOException
      */
     public void diff(DiffHandler handler, DiffCriteria criteria)
-        throws DiffException 
+        throws DiffException
+    {
+        diff(handler, criteria, oldVersion, newVersion, oldClassInfo, newClassInfo);
+    }
+
+    private void diff(DiffHandler handler, DiffCriteria criteria,
+        String oldVersion, String newVersion,
+        Map oldClassInfo, Map newClassInfo) throws DiffException
     {
         // TODO: Build the name from the MANIFEST rather than the filename
         handler.startDiff(oldVersion, newVersion);
diff --git a/api/src/test/java/org/semver/jardiff/ClassInheritanceTest.java b/api/src/test/java/org/semver/jardiff/ClassInheritanceTest.java
new file mode 100644
index 0000000..f399a8d
--- /dev/null
+++ b/api/src/test/java/org/semver/jardiff/ClassInheritanceTest.java
@@ -0,0 +1,96 @@
+/**
+ * Copyright 2012 Julien Eluard and contributors.
+ * This project includes software developed by Julien Eluard: https://github.com/jeluard/
+ *
+ * Licensed 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.semver.jardiff;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+import org.objectweb.asm.ClassReader;
+import org.osjava.jardiff.ClassInfo;
+import org.osjava.jardiff.DiffCriteria;
+import org.osjava.jardiff.DiffHandler;
+import org.osjava.jardiff.JarDiff;
+import org.osjava.jardiff.SimpleDiffCriteria;
+import org.semver.Delta;
+import org.semver.Delta.Change;
+
+public class ClassInheritanceTest {
+
+  public static abstract class InheritanceRoot {
+    public abstract void aMethod();
+  }
+
+  public static class DirectDescendant extends InheritanceRoot {
+    @Override
+    public void aMethod() {}
+  }
+
+  public static class ClassA extends InheritanceRoot {
+    @Override
+    public void aMethod() {}
+  }
+
+  public static class ClassB extends DirectDescendant {
+  }
+
+  public static class ClassC {
+    public void totallyDifferentMethod(int x) {};
+  }
+
+  @Test
+  public void shouldInheritedMethodMatchImplementedMethod() throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
+    /**
+     * The situation we are testing is as follows:
+     * Abstract class InheritanceRoot is initially implemented directly by ClassA.
+     * ClassA is later modified to extend another implementation of InheritanceRoot
+     * and the methods required by InheritanceRoot are now removed from ClassA directly,
+     * and instead inherited from the new parent, DirectDescendant. For the purposes of
+     * this test, this new ClassA is represented by ClassB (as we can't have the same
+     * class declared twice in a test -- in real life, this would both be ClassA's,
+     * in different jars).
+     */
+    Map<String, ClassInfo> oldClassInfoMap = new HashMap<String, ClassInfo>();
+    Map<String, ClassInfo> newClassInfoMap = new HashMap<String, ClassInfo>();
+    JarDiff jd = new JarDiff();
+    Method loadInfoMethod = JarDiff.class.getDeclaredMethod("loadClassInfo", ClassReader.class);
+    Method diffMethod = JarDiff.class.getDeclaredMethod("diff", DiffHandler.class, DiffCriteria.class,
+        String.class, String.class,
+        Map.class, Map.class);
+    diffMethod.setAccessible(true);
+    loadInfoMethod.setAccessible(true);
+    ClassInfo classInfoA = (ClassInfo) loadInfoMethod.invoke(jd, new ClassReader(ClassA.class.getName()));
+    oldClassInfoMap.put("ClassA", classInfoA);
+    ClassInfo classInfoB = (ClassInfo) loadInfoMethod.invoke(jd, new ClassReader(ClassB.class.getName()));
+    newClassInfoMap.put("ClassA", classInfoB);
+    DifferenceAccumulatingHandler handler = new DifferenceAccumulatingHandler();
+    diffMethod.invoke(jd, handler, new SimpleDiffCriteria(),
+        "0.1.0", "0.2.0", oldClassInfoMap, newClassInfoMap);
+
+    for (Delta.Difference d: handler.getDelta().getDifferences()) {
+      System.err.println(d.getClassName() + " : " + d.getClass().getName()
+          + " : " + d.getInfo().getName());
+      if (d instanceof Change) {
+        System.err.println("  : " + ((Change) d).getModifiedInfo().getName());
+      }
+    }
+    // We expect the class name change from ClassA to ClassB, and no other changes.
+    Assert.assertEquals("differences found", 1, handler.getDelta().getDifferences().size());
+  }
+
+}