public async Task GetPolicyAsync_When_Matched_Policy_Provider_Returns_Policy()
        {
            var sut         = new CompositeAuthorizationPolicyProvider(new TestPolicyProvider("Foo"), new TestPolicyProvider("Bar"));
            var firstPolicy = await sut.GetPolicyAsync("Foo"); // from first provider

            Assert.NotNull(firstPolicy);

            var secondPolicy = await sut.GetPolicyAsync("Bar"); // from second provider

            Assert.NotNull(secondPolicy);

            Assert.NotSame(firstPolicy, secondPolicy);
        }
        public async Task GetPolicyAsync_When_No_Matched_Policy_Provider_Returns_Null_Policy()
        {
            var sut    = new CompositeAuthorizationPolicyProvider(new TestPolicyProvider("Foo"), new TestPolicyProvider("Bar"));
            var policy = await sut.GetPolicyAsync("BAZ");

            Assert.Null(policy);
        }