[COMPRESS-872] Add MultiKeyMapTest.testCompress872()

Author: garydgregory

src/test/java/org/apache/commons/collections4/map/MultiKeyMapTest.java

@@ -25,6 +25,7 @@
 import static org.junit.jupiter.api.Assertions.fail;
 
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
 
 import org.apache.commons.collections4.MapIterator;
 import org.apache.commons.collections4.keyvalue.MultiKey;
@@ -136,6 +137,32 @@ public void testClone() {
         assertSame(map.get(new MultiKey<>((K) I1, (K) I2)), cloned.get(new MultiKey<>((K) I1, (K) I2)));
     }
 
+    /**
+     * Tests COMPRESS-872
+     * <p>
+     * Claim:
+     * </p>
+     * <ol>
+     * <li>Create a MultiKeyMap, with key(s) of a type (class/record) which has some fields.
+     * <li>Use multiKeyMap.put(T... keys, V value), to create an entry in the Map, to map the keys to a value
+     * <li>Use multiKeyMap.get(T... keys), to verify that the mapping exists and returns the expected value.
+     * <li>Modify/alter any of the objects used as a key. It is enough to change the value of any member field of any of the objects.
+     * <li>Use multiKeyMap.get(T... keys) again, however, now there is no mapping for these keys!
+     * <li>Use multiKeyMap.get(T... keys) with the new modified/altered objects, and it will return the expected value
+     * </ol>
+     */
+    @Test
+    public void testCompress872() {
+        final AtomicReference<String> k1 = new AtomicReference<>("K1v1");
+        final AtomicReference<String> k2 = new AtomicReference<>("K2v1");
+        final MultiKeyMap<AtomicReference<String>, String> map = (MultiKeyMap<AtomicReference<String>, String>) makeObject();
+        assertNull(map.put(k1, k2, "V"));
+        assertEquals("V", map.get(k1, k2));
+        k1.set("K1v2");
+        assertEquals("V", map.get(k1, k2));
+        assertEquals("V", map.get(k1, k2));
+    }
+
     @Test
     @SuppressWarnings("unchecked")
     public void testLRUMultiKeyMap() {
@@ -437,6 +464,17 @@ public void testMultiKeyRemoveAll3() {
         }
     }
 
+//    public void testCreate() throws Exception {
+//        resetEmpty();
+//        writeExternalFormToDisk(
+//            (java.io.Serializable) map,
+//            "src/test/resources/data/test/MultiKeyMap.emptyCollection.version4.obj");
+//        resetFull();
+//        writeExternalFormToDisk(
+//            (java.io.Serializable) map,
+//            "src/test/resources/data/test/MultiKeyMap.fullCollection.version4.obj");
+//    }
+
     @Test
     public void testMultiKeyRemoveAll4() {
         resetFull();
@@ -451,17 +489,6 @@ public void testMultiKeyRemoveAll4() {
         }
     }
 
-//    public void testCreate() throws Exception {
-//        resetEmpty();
-//        writeExternalFormToDisk(
-//            (java.io.Serializable) map,
-//            "src/test/resources/data/test/MultiKeyMap.emptyCollection.version4.obj");
-//        resetFull();
-//        writeExternalFormToDisk(
-//            (java.io.Serializable) map,
-//            "src/test/resources/data/test/MultiKeyMap.fullCollection.version4.obj");
-//    }
-
     @Test
     @SuppressWarnings("unchecked")
     public void testNullHandling() {
@@ -480,4 +507,5 @@ public void testNullHandling() {
 
         assertThrows(NullPointerException.class, () -> map.put(null, (V) new Object()));
     }
+
 }