Add smoke test to Lambda OCI images for TZData being available. (#1636)

Author: normj

LambdaRuntimeDockerfiles/SmokeTests/test/ImageFunction.SmokeTests/ImageFunctionTests.cs

@@ -71,6 +71,7 @@ public ImageFunctionTests()
         [InlineData("ImageFunction::ImageFunction.Function::Ping", "ping", "pong")]
         [InlineData("ImageFunction::ImageFunction.Function::HttpsWorksAsync", "", "SUCCESS")]
         [InlineData("ImageFunction::ImageFunction.Function::VerifyLambdaContext", "", "SUCCESS")]
+        [InlineData("ImageFunction::ImageFunction.Function::VerifyTzData", "", "SUCCESS")]
         public async Task SuccessfulTests(string handler, string input, string expectedResponse)
         {
             await UpdateHandlerAsync(handler);
@@ -170,6 +171,7 @@ await _lambdaClient.CreateFunctionAsync(new CreateFunctionRequest
                         MemorySize = 512,
                         Role = _executionRoleArn,
                         PackageType = PackageType.Image,
+                        Timeout = 30,
                         Architectures = new List<string> {GetArchitecture()}
                     });
                     break;

LambdaRuntimeDockerfiles/SmokeTests/test/ImageFunction/Function.cs

@@ -116,6 +116,18 @@ public string VerifyLambdaContext(ILambdaContext lambdaContext)
             return GetResponse(true);
         }
 
+        // .NET on Linux uses the tzdata system package to get time zone information.
+        // If TzData is not installed/available in the Linux environment the 
+        // TimeZoneInfo.GetSystemTimeZones() will return an empty collection.
+        // For futher information: https://github.com/aws/aws-lambda-dotnet/issues/1620
+        public string VerifyTzData(ILambdaContext lambdaContext)
+        {
+            AssertTrue(TimeZoneInfo.GetSystemTimeZones().Count > 0, "No time zones were found");
+            AssertNotNull(TimeZoneInfo.FindSystemTimeZoneById("Europe/London"), "Failed to find Europe/London timezone");
+
+            return SuccessResult;
+        }
+
         #endregion
 
         #region Private methods