assertNotNull(provider);
        assertNotNull(provider.providePrimaryInvertibleCryptographer());
        assertEquals(invertibleCryptographer, provider.providePrimaryInvertibleCryptographer());
        assertNull(provider.providePrimaryOneWayCryptographer());
    }

    @Test
    public void test_constructor_withBothNull() {

        this.primaryInvertibleCryptographer = primaryInvertibleCryptographer;
        this.primaryOneWayCryptographer = primaryOneWayCryptographer;
    }

    @Override
    public InvertibleCryptographer providePrimaryInvertibleCryptographer() {
        return primaryInvertibleCryptographer;
    }

    @Override
    public OneWayCryptographer providePrimaryOneWayCryptographer() {
        return primaryOneWayCryptographer;
    }