assertNotNull(authenticator.getLastResolver());
    }

    public void test_resolveCredential_withNullResolver() {
        // Execute
        authenticator.resolveCredential(null);

        // Verify
        assertTrue(authenticator.isResolverCalled());
        assertNull(authenticator.getLastResolver());
    }

    public void test_resolveCredential_multipleResolvers() {