Remove ruamel-yaml-string package (#1218)

The usage of the `ruamel-yaml-string` package is isolated to one test
only. The same functionality is easily be provided with a simple class
method.

Author: dogukancagatay

pdm.lock

@@ -95,7 +95,6 @@ dev = [
     "types-PyYAML<7.0.0,>=6.0.3",
     "types-certifi<2021.10.9,>=2020.0.0",
     "types-python-dateutil<3.0.0,>=2.0.0",
-    "ruamel-yaml-string>=0.1.1",
     "syrupy>=4",
 ]
 

pyproject.toml

@@ -1,12 +1,22 @@
 import json
 import os
+from io import StringIO
 from pathlib import Path
+from typing import Any
 
 import pytest
-from ruamel.yaml import YAML
+from ruamel.yaml import YAML as _YAML
 
 from openapi_python_client.config import ConfigFile
 
+
+class YAML(_YAML):
+    def dump_to_string(self, data: Any, **kwargs: Any) -> str:
+        stream = StringIO()
+        self.dump(data=data, stream=stream, **kwargs)
+        return stream.getvalue()
+
+
 yaml = YAML(typ=["safe", "string"])