chore(metrics): test dimensions limit with service set

Author: heitorlessa

Diff for: tests/functional/test_metrics.py

@@ -331,6 +331,19 @@ def test_exceed_number_of_dimensions(metric, namespace):
                 my_metric.add_dimension(**dimension)
 
 
+def test_exceed_number_of_dimensions_with_service(metric, namespace, monkeypatch):
+    # GIVEN we have service set and add more dimensions than CloudWatch supports (N+1)
+    monkeypatch.setenv("POWERTOOLS_SERVICE_NAME", "test_service")
+    dimensions = [{"name": f"test_{i}", "value": "test"} for i in range(9)]
+
+    # WHEN we attempt to serialize them into a valid EMF object
+    # THEN it should fail validation and raise SchemaValidationError
+    with pytest.raises(SchemaValidationError, match="Maximum number of dimensions exceeded.*"):
+        with single_metric(**metric, namespace=namespace) as my_metric:
+            for dimension in dimensions:
+                my_metric.add_dimension(**dimension)
+
+
 def test_log_metrics_during_exception(capsys, metric, dimension, namespace):
     # GIVEN Metrics is initialized
     my_metrics = Metrics(namespace=namespace)