test: adjust error format

tests/test_parser.py

@@ -9,10 +9,10 @@ def test_parser_error_parsing_file() -> None:
 
 
 def test_parser_invalid_yaml() -> None:
-    with pytest.raises(RuntimeError, match=r"Empty yaml file, aborting."):
+    with pytest.raises(RuntimeError, match=r"Error parsing file 'tests/ymls/others/empty.yml'.*"):
         Parser().parse("tests/ymls/others/empty.yml")
 
 
 def test_parser_no_services_found() -> None:
-    with pytest.raises(RuntimeError, match=r"No services found, aborting."):
+    with pytest.raises(AssertionError, match=r"No services found, aborting."):
         Parser().parse("tests/ymls/others/no-services.yml")

tests/ymls/others/no-services.yml

@@ -1,3 +1 @@
-what-is-this:
-  - "a yaml file without services"
-  - "test purpose"
+version: "A docker-compose file without services."