Drop redundant test_request.py, fold missing-schema test into test_model_settings

Author: juliendenize

tests/test_model_settings.py

@@ -238,6 +238,11 @@ def test_builder_json_schema_yields_custom_schema() -> None:
     assert b.build_settings(_req(rf)).json_schema == JSON_SCHEMA_DICT
 
 
+def test_json_schema_missing_schema_raises() -> None:
+    with pytest.raises(InvalidRequestException, match="must define the schema"):
+        ResponseFormat(type=ResponseFormats.json_schema).get_schema()
+
+
 def test_builder_without_json_schema_ignores_response_format() -> None:
     assert ModelSettingsBuilder().build_settings(_req(ResponseFormat(type=ResponseFormats.json))).json_schema is None