Run unittest tests with unittest

[jeremy-audet]

The unit tests in the following directories are written to unittest, not pytest:

• samples/client/echo_api/python/
• samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/

If pytest is told to execute these tests, it will log warnings about being unable to collect certain tests.

[jeremy-audet]

Split from #19068

ping python tech committee members: @cbornet @tomplus @krjakbrjak @fa0311 @multani

[multani]

@Ichimonji10 do you have the list of warnings generated?

AFAIK, pytest should be able to execute unittest without any warnings, by default.

[jeremy-audet]

Here's the warnings emitted when I locally run python -m pytest. Similar output can be seen in pipeline results.

openapi_client/models/test_form_object_multipart_request_marker.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_form_object_multipart_request_marker.py:26: PytestCollectionWarning: cannot collect test class 'TestFormObjectMultipartRequestMarker' because it has a __init__ constructor (from: openapi_client/models/test_form_object_multipart_request_marker.py)
    class TestFormObjectMultipartRequestMarker(BaseModel):

openapi_client/models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter' because it has a __init__ constructor (from: openapi_client/models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py)
    class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter(BaseModel):

openapi_client/models/test_query_style_form_explode_true_array_integer_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_form_explode_true_array_integer_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleFormExplodeTrueArrayIntegerQueryObjectParameter' because it has a __init__ constructor (from: openapi_client/models/test_query_style_form_explode_true_array_integer_query_object_parameter.py)
    class TestQueryStyleFormExplodeTrueArrayIntegerQueryObjectParameter(BaseModel):

openapi_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter' because it has a __init__ constructor (from: openapi_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py)
    class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter(BaseModel):

openapi_client/models/test_form_object_multipart_request_marker.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_form_object_multipart_request_marker.py:26: PytestCollectionWarning: cannot collect test class 'TestFormObjectMultipartRequestMarker' because it has a __init__ constructor (from: test/test_test_form_object_multipart_request_marker.py)
    class TestFormObjectMultipartRequestMarker(BaseModel):

openapi_client/models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter' because it has a __init__ constructor (from: test/test_test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py)
    class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter(BaseModel):

openapi_client/models/test_query_style_form_explode_true_array_integer_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_form_explode_true_array_integer_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleFormExplodeTrueArrayIntegerQueryObjectParameter' because it has a __init__ constructor (from: test/test_test_query_style_form_explode_true_array_integer_query_object_parameter.py)
    class TestQueryStyleFormExplodeTrueArrayIntegerQueryObjectParameter(BaseModel):

openapi_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py:26
  /home/jaudet/code/openapi-generator/samples/client/echo_api/python/openapi_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py:26: PytestCollectionWarning: cannot collect test class 'TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter' because it has a __init__ constructor (from: test/test_test_query_style_form_explode_true_array_string_query_object_parameter.py)
    class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter(BaseModel):

Even if pytest can run unittest-style tests, I don't see why that would be done, as no pytest features are being used AFAIK. Switching to unittest means fewer warnings and (at least) one less dependency.

[multani]

We can merge this change.

Overall, I think unittest usage would be removed in favor of simpler pytest-based tests, but that's a much larger change.