Improve mqtt test (#42490)

homeassistant/helpers/template.py

@@ -428,7 +428,7 @@ class Template:
             # output; use the original render instead of the evaluated one.
             if not isinstance(result, str):
                 return result
-        except (ValueError, SyntaxError, MemoryError):
+        except (ValueError, TypeError, SyntaxError, MemoryError):
             pass
 
         return render_result

tests/components/mqtt/test_init.py

@@ -1502,6 +1502,7 @@ async def test_debug_info_qos_retain(hass, mqtt_mock):
 async def test_publish_json_from_template(hass, mqtt_mock):
     """Test the publishing of call to services."""
     test_str = "{'valid': 'python', 'invalid': 'json'}"
+    test_str_tpl = "{'valid': '{{ \"python\" }}', 'invalid': 'json'}"
 
     await async_setup_component(
         hass,
@@ -1511,13 +1512,16 @@ async def test_publish_json_from_template(hass, mqtt_mock):
                 "test_script_payload": {
                     "sequence": {
                         "service": "mqtt.publish",
-                        "data": {"topic": "test-topic", "payload": test_str},
+                        "data": {"topic": "test-topic", "payload": test_str_tpl},
                     }
                 },
                 "test_script_payload_template": {
                     "sequence": {
                         "service": "mqtt.publish",
-                        "data": {"topic": "test-topic", "payload_template": test_str},
+                        "data": {
+                            "topic": "test-topic",
+                            "payload_template": test_str_tpl,
+                        },
                     }
                 },
             }

tests/helpers/test_template.py

@@ -2698,3 +2698,13 @@ async def test_result_wrappers(hass):
         assert result == native
         assert result.render_result == text
         schema(result)  # should not raise
+
+
+async def test_parse_result(hass):
+    """Test parse result."""
+    for tpl, result in (
+        ('{{ "{{}}" }}', "{{}}"),
+        ("not-something", "not-something"),
+        ("2a", "2a"),
+    ):
+        assert template.Template(tpl, hass).async_render() == result