// it still should only have executed once due to memoization
    assertEquals(1, countingSupplier.calls);
  }

  public void testMemoize() {
    memoizeTest(new CountingSupplier());
    memoizeTest(new SerializableCountingSupplier());
  }

  private void memoizeTest(CountingSupplier countingSupplier) {
    Supplier<Integer> memoizedSupplier = Suppliers.memoize(countingSupplier);
    checkMemoize(countingSupplier, memoizedSupplier);

    // it still should only have executed once due to memoization
    assertEquals(1, countingSupplier.calls);
  }

  public void testMemoize() {
    memoizeTest(new CountingSupplier());
    memoizeTest(new SerializableCountingSupplier());
  }

  private void memoizeTest(CountingSupplier countingSupplier) {
    Supplier<Integer> memoizedSupplier = Suppliers.memoize(countingSupplier);
    checkMemoize(countingSupplier, memoizedSupplier);