if (previous != null) {
          throw new AssertionError();
        }
      }
      return this;
    }

    @CanIgnoreReturnValue
    RoundToDoubleTester roundUnnecessaryShouldThrow() {
      unnecessaryShouldThrow = true;
      return this;
    }

    void test() {
      assertThat(expectedValues.keySet())

        if (previous != null) {
          throw new AssertionError();
        }
      }
      return this;
    }

    @CanIgnoreReturnValue
    RoundToDoubleTester roundUnnecessaryShouldThrow() {
      unnecessaryShouldThrow = true;
      return this;
    }

    void test() {
      assertThat(expectedValues.keySet())

      return this;
    }

    final void assertNonNullValues(Object... expectedValues) {
      assertEquals(expectedValues.length, arguments.size());
      for (int i = 0; i < expectedValues.length; i++) {
        assertEquals("Default value for parameter #" + i, expectedValues[i], arguments.get(i));
      }
    }

    final Object getDefaultParameterValue(int position) {

    private @Nullable ValueEntry<K, V> lastEntry;

    ValueSet(@ParametricNullness K key, int expectedValues) {
      this.key = key;
      // Round expected values up to a power of 2 to get the table size.
      int tableSize = Hashing.closedTableSize(expectedValues, VALUE_SET_LOAD_FACTOR);

      @SuppressWarnings({"rawtypes", "unchecked"})

  }

  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;
    }

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

    @Override
    public void onSuccess(String result) {

  }

  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;
    }

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

    @Override
    public void onSuccess(String result) {

        for (Thread thread : threads) {
            thread.join();
        }

        // All results should be the same
        String expectedValue = "Test Fess";
        for (String result : results) {
            assertEquals(expectedValue, result);
        }
    }

    // Test with non-existent config
    public void test_initialize_invalidConfigFile() {

      int initialSize = map.size();
      // var oldValue = 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));
    }