Add UseConfigureAwait test for a 'dynamic' expression

Author: sharwell

AsyncUsageAnalyzers/AsyncUsageAnalyzers.Test/Usage/UseConfigureAwaitUnitTests.cs

@@ -44,6 +44,23 @@ async Task MethodNameAsync()
             await this.VerifyCSharpFixAsync(testCode, fixedCode, cancellationToken: CancellationToken.None).ConfigureAwait(false);
         }
 
+        [Fact]
+        public async Task TestDynamicExpressionAsync()
+        {
+            string testCode = @"
+using System.Threading.Tasks;
+class ClassName
+{
+    async Task MethodNameAsync()
+    {
+        await (dynamic)Task.Delay(1000);
+    }
+}
+";
+
+            await this.VerifyCSharpDiagnosticAsync(testCode, EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
+        }
+
         [Fact]
         public async Task TestNestedExpressionsAsync()
         {