Object expectedKey = alternatingKeysAndValues[2 * i];
      Object expectedValue = alternatingKeysAndValues[2 * i + 1];
      Entry<Object, Object> expectedEntry = immutableEntry(expectedKey, expectedValue);
      assertEquals(expectedEntry, entries.get(i));
      assertEquals(expectedKey, keys.get(i));
      assertEquals(expectedValue, values.get(i));
    }
  }

  public void testAllocArraysDefault() {

  }

  public void testCompletedFuture(@Nullable Object expectedValue)
      throws InterruptedException, ExecutionException {
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());

    assertTrue(latch.await(5, SECONDS));
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());

    assertEquals(expectedValue, future.get());
  }

    @Nullable private Throwable failure = null;
    private boolean wasCalled = false;
    private final Object monitor = new Object();

    MockCallback(String expectedValue) {
      this.value = expectedValue;
    }

    public MockCallback(Throwable expectedFailure) {
      this.failure = expectedFailure;
    }

    @Override
    public void onSuccess(String result) {

      return;
    }
    K keyToRemove = map.keySet().iterator().next();
    if (supportsRemove) {
      int initialSize = map.size();
      V expectedValue = map.get(keyToRemove);
      V oldValue = map.remove(keyToRemove);
      assertEquals(expectedValue, oldValue);
      assertFalse(map.containsKey(keyToRemove));
      assertEquals(initialSize - 1, map.size());
    } else {

      return;
    }
    K keyToRemove = map.keySet().iterator().next();
    if (supportsRemove) {
      int initialSize = map.size();
      V expectedValue = map.get(keyToRemove);
      V oldValue = map.remove(keyToRemove);
      assertEquals(expectedValue, oldValue);
      assertFalse(map.containsKey(keyToRemove));
      assertEquals(initialSize - 1, map.size());
    } else {

        int initialSize = map.size();
        map.get(keyToRemove);
        map.remove(keyToRemove);
        // This line doesn't hold - see the Javadoc comments above.
        // assertEquals(expectedValue, oldValue);
        assertFalse(map.containsKey(keyToRemove));
        assertEquals(initialSize - 1, map.size());
      } else {
        assertThrows(UnsupportedOperationException.class, () -> map.remove(keyToRemove));

        int initialSize = map.size();
        map.get(keyToRemove);
        map.remove(keyToRemove);
        // This line doesn't hold - see the Javadoc comments above.
        // assertEquals(expectedValue, oldValue);
        assertFalse(map.containsKey(keyToRemove));
        assertEquals(initialSize - 1, map.size());
      } else {
        assertThrows(UnsupportedOperationException.class, () -> map.remove(keyToRemove));

type check struct {
	*testing.T
	testType string
}

// Assert - checks if gotValue is same as expectedValue, if not fails the test.
func (c *check) Assert(gotValue interface{}, expectedValue interface{}) {
	c.Helper()
	if !reflect.DeepEqual(gotValue, expectedValue) {
		c.Fatalf("Test %s expected %v, got %v", c.testType, expectedValue, gotValue)
	}
}