public async Task TestIamPermissionsAsync()
        {
            // Snippet: TestIamPermissionsAsync(string,IEnumerable<string>,CallSettings)
            // Additional: TestIamPermissionsAsync(string,IEnumerable<string>,CancellationToken)
            // Create client
            PublisherClient publisherClient = PublisherClient.Create();
            // Initialize request argument(s)
            string formattedResource         = PublisherClient.FormatTopicName("[PROJECT]", "[TOPIC]");
            IEnumerable <string> permissions = new List <string>();
            // Make the request
            TestIamPermissionsResponse response = await publisherClient.TestIamPermissionsAsync(formattedResource, permissions);

            // End snippet
        }
        public async Task TestIamPermissionsAsync_RequestObject()
        {
            // Snippet: TestIamPermissionsAsync(TestIamPermissionsRequest,CallSettings)
            // Create client
            PublisherClient publisherClient = await PublisherClient.CreateAsync();

            // Initialize request argument(s)
            TestIamPermissionsRequest request = new TestIamPermissionsRequest
            {
                Resource    = new TopicName("[PROJECT]", "[TOPIC]").ToString(),
                Permissions = { },
            };
            // Make the request
            TestIamPermissionsResponse response = await publisherClient.TestIamPermissionsAsync(request);

            // End snippet
        }