Add E2E tests

Author: Vandita2020

test/e2e/resources/function_layers.yaml

@@ -0,0 +1,16 @@
+apiVersion: lambda.services.k8s.aws/v1alpha1
+kind: Function
+metadata:
+  name: $FUNCTION_NAME
+  annotations:
+    services.k8s.aws/region: $AWS_REGION
+spec:
+  name: $FUNCTION_NAME
+  code:
+    s3Bucket: $BUCKET_NAME
+    s3Key: $LAMBDA_FILE_NAME
+  role: $LAMBDA_ROLE
+  runtime: python3.9
+  handler: main
+  layers: [$LAYERS]
+  description: function created by ACK lambda-controller e2e tests

test/e2e/tests/test_function.py

@@ -664,6 +664,67 @@ def test_function_features(self, lambda_client):
 
         # Check Lambda function doesn't exist
         assert not lambda_validator.function_exists(resource_name)
+    
+    def test_function_layers(self, lambda_client):
+        resource_name = random_suffix_name("functionlayers", 24)
+
+        resources = get_bootstrap_resources()
+        logging.debug(resources)
+
+        replacements = REPLACEMENT_VALUES.copy()
+        replacements["FUNCTION_NAME"] = resource_name
+        replacements["BUCKET_NAME"] = resources.FunctionsBucket.name
+        replacements["LAMBDA_ROLE"] = resources.EICRole.arn
+        replacements["LAMBDA_FILE_NAME"] = LAMBDA_FUNCTION_FILE_ZIP
+        replacements["AWS_REGION"] = get_region()
+        replacements["LAYERS"] = "arn:aws:lambda:us-west-2:336392948345:layer:AWSSDKPandas-Python310:14"
+
+        # Load Lambda CR
+        resource_data = load_lambda_resource(
+            "function_layers",
+            additional_replacements=replacements,
+        )
+        logging.debug(resource_data)
+
+        # Create k8s resource
+        ref = k8s.CustomResourceReference(
+            CRD_GROUP, CRD_VERSION, RESOURCE_PLURAL,
+            resource_name, namespace="default",
+        )
+        k8s.create_custom_resource(ref, resource_data)
+        cr = k8s.wait_resource_consumed_by_controller(ref)
+
+        assert cr is not None
+        assert k8s.get_resource_exists(ref)
+
+        time.sleep(CREATE_WAIT_AFTER_SECONDS)
+
+        cr = k8s.wait_resource_consumed_by_controller(ref)
+
+        lambda_validator = LambdaValidator(lambda_client)
+
+        # Check Lambda function exists
+        assert lambda_validator.function_exists(resource_name)
+
+        # Update cr
+        cr["spec"]["layers"] = ["arn:aws:lambda:us-west-2:017000801446:layer:AWSLambdaPowertoolsPythonV2:68"]
+
+        #Patch k8s resource
+        k8s.patch_custom_resource(ref, cr)
+        time.sleep(UPDATE_WAIT_AFTER_SECONDS)
+
+        #Check function_snapstart update fields
+        function = lambda_validator.get_function(resource_name)
+        assert function["Configuration"]["Layers"]["Arn"] == "arn:aws:lambda:us-west-2:017000801446:layer:AWSLambdaPowertoolsPythonV2:68"
+
+        # Delete k8s resource
+        _, deleted = k8s.delete_custom_resource(ref)
+        assert deleted is True
+
+        time.sleep(DELETE_WAIT_AFTER_SECONDS)
+
+        # Check Lambda function doesn't exist
+        assert not lambda_validator.function_exists(resource_name)
 
     def test_function_event_invoke_config(self, lambda_client):
         resource_name = random_suffix_name("lambda-function", 24)