test/jdk/java/util/concurrent/tck/MapTest.java

*** 164,172 ****
--- 164,186 ----
          assertTrue(m.containsValue(v2));
          assertTrue(m.containsKey(keyToFrob));
          assertEquals(1, m.size());
      }
  
+     /**
+      * "Missing" test found while investigating JDK-8210280.
+      * See discussion on mailing list.
+      * TODO: randomize
+      */
+     public void testBug8210280() {
+         Map m = impl.emptyMap();
+         for (int i = 0; i < 4; i++) m.put(7 + i * 16, 0);
+         Map more = impl.emptyMap();
+         for (int i = 0; i < 128; i++) more.put(-i, 42);
+         m.putAll(more);
+         for (int i = 0; i < 4; i++) assertEquals(0, m.get(7 + i * 16));
+     }
+ 
  //     public void testFailsIntentionallyForDebugging() {
  //         fail(impl.klazz().getSimpleName());
  //     }
  }