fix(cloudwatch): handle None metric alarms (#7205)

tests/providers/aws/services/cloudwatch/cloudwatch_alarm_actions_alarm_state_configured/cloudwatch_alarm_actions_alarm_state_configured_test.py

@@ -28,7 +28,6 @@ class Test_cloudwatch_alarm_actions_alarm_state_configured:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_alarm_actions_alarm_state_configured import (
                 cloudwatch_alarm_actions_alarm_state_configured,
             )
@@ -38,6 +37,38 @@ class Test_cloudwatch_alarm_actions_alarm_state_configured:
 
             assert len(result) == 0
 
+    @mock_aws
+    def test_none_cloudwatch_alarms(self):
+        cloudwatch_client = client("cloudwatch", region_name=AWS_REGION_US_EAST_1)
+        cloudwatch_client.metric_alarms = []
+
+        from prowler.providers.aws.services.cloudwatch.cloudwatch_service import (
+            CloudWatch,
+        )
+
+        aws_provider = set_mocked_aws_provider([AWS_REGION_US_EAST_1])
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=aws_provider,
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_client",
+                new=CloudWatch(aws_provider),
+            ) as cloudwatch_client_mock,
+        ):
+            from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_alarm_actions_alarm_state_configured import (
+                cloudwatch_alarm_actions_alarm_state_configured,
+            )
+
+            cloudwatch_client_mock.metric_alarms = None
+
+            check = cloudwatch_alarm_actions_alarm_state_configured()
+            result = check.execute()
+
+            assert len(result) == 0
+
     @mock_aws
     def test_cloudwatch_alarms_actions_configured(self):
         cloudwatch_client = client("cloudwatch", region_name=AWS_REGION_US_EAST_1)
@@ -66,7 +97,6 @@ class Test_cloudwatch_alarm_actions_alarm_state_configured:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_alarm_actions_alarm_state_configured import (
                 cloudwatch_alarm_actions_alarm_state_configured,
             )
@@ -116,7 +146,6 @@ class Test_cloudwatch_alarm_actions_alarm_state_configured:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_alarm_state_configured.cloudwatch_alarm_actions_alarm_state_configured import (
                 cloudwatch_alarm_actions_alarm_state_configured,
             )

tests/providers/aws/services/cloudwatch/cloudwatch_alarm_actions_enabled/cloudwatch_alarm_actions_enabled_test.py

@@ -28,7 +28,6 @@ class Test_cloudwatch_alarm_actions_enabled:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_enabled.cloudwatch_alarm_actions_enabled import (
                 cloudwatch_alarm_actions_enabled,
             )
@@ -38,6 +37,37 @@ class Test_cloudwatch_alarm_actions_enabled:
 
             assert len(result) == 0
 
+    def test_none_cloudwatch_alarms(self):
+        cloudwatch_client = client("cloudwatch", region_name=AWS_REGION_US_EAST_1)
+        cloudwatch_client.metric_alarms = []
+
+        from prowler.providers.aws.services.cloudwatch.cloudwatch_service import (
+            CloudWatch,
+        )
+
+        aws_provider = set_mocked_aws_provider([AWS_REGION_US_EAST_1])
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=aws_provider,
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_enabled.cloudwatch_alarm_actions_enabled.cloudwatch_client",
+                new=CloudWatch(aws_provider),
+            ) as cloudwatch_client_mock,
+        ):
+            from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_enabled.cloudwatch_alarm_actions_enabled import (
+                cloudwatch_alarm_actions_enabled,
+            )
+
+            cloudwatch_client_mock.metric_alarms = None
+
+            check = cloudwatch_alarm_actions_enabled()
+            result = check.execute()
+
+            assert len(result) == 0
+
     @mock_aws
     def test_cloudwatch_alarms_actions_enabled(self):
         cloudwatch_client = client("cloudwatch", region_name=AWS_REGION_US_EAST_1)
@@ -66,7 +96,6 @@ class Test_cloudwatch_alarm_actions_enabled:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_enabled.cloudwatch_alarm_actions_enabled import (
                 cloudwatch_alarm_actions_enabled,
             )
@@ -116,7 +145,6 @@ class Test_cloudwatch_alarm_actions_enabled:
                 new=CloudWatch(aws_provider),
             ),
         ):
-
             from prowler.providers.aws.services.cloudwatch.cloudwatch_alarm_actions_enabled.cloudwatch_alarm_actions_enabled import (
                 cloudwatch_alarm_actions_enabled,
             )