Add test for AuthenticationSchemes (#17816)

src/Security/Authorization/test/AuthorizationMiddlewareTests.cs

@@ -135,6 +135,27 @@ namespace Microsoft.AspNetCore.Authorization.Test
             Assert.True(authenticationService.ChallengeCalled);
         }
 
+        [Fact]
+        public async Task HasEndpointWithAuth_ChallengesAuthenticationSchemes()
+        {
+            // Arrange
+            var policy = new AuthorizationPolicyBuilder().RequireAuthenticatedUser().Build();
+            var policyProvider = new Mock<IAuthorizationPolicyProvider>();
+            policyProvider.Setup(p => p.GetDefaultPolicyAsync()).ReturnsAsync(policy);
+            var next = new TestRequestDelegate();
+            var authenticationService = new TestAuthenticationService();
+
+            var middleware = CreateMiddleware(next.Invoke, policyProvider.Object);
+            var context = GetHttpContext(endpoint: CreateEndpoint(new AuthorizeAttribute() { AuthenticationSchemes = "whatever"}), authenticationService: authenticationService);
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.False(next.Called);
+            Assert.True(authenticationService.ChallengeCalled);
+        }
+        
         [Fact]
         public async Task HasEndpointWithAuth_AnonymousUser_ChallengePerScheme()
         {