[python-asyncio] tests and fixes

[tomplus]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

I prepared some fixes (creating ssl context, sending queries with args, forms or files) and added some tests for python-asyncio.

PTAL: @wing328 @taxpon @frol @mbohlool @cbornet @kenjones-cisco @toumorokoshi

[tomplus]

asyncio with coroutine function definition requires Python 3.5+. I also switched from nosetest to pytest which supports asyncio.

[tomplus]

Tests failed because Travis hasn't got Python 3.5+. Our Travis configuration is for Java and I'm not sure if it's possible to install other language. Do you know how I can configure it ?

[frol]

The changes look good to me.

I vote for using pytest for all the types of the client. Any objectives?

I have no idea about Travis setup, so I cannot help here.

[wing328]

Our Travis configuration is for Java and I'm not sure if it's possible to install other language. Do you know how I can configure it ?

It should be possible to update to a newer version of Python. I'll check later after 2.3.0 release.

[toumorokoshi]

+1 for pytest as well. There's an asyncio pytest plugin that we could use:

https://pypi.python.org/pypi/pytest-asyncio

But I'm fine with the unit tests as is too, in the interest of just getting some form of coverage on these for now.

[tomplus]

@toumorokoshi Thanks for your feedback.

Coverage is not very bad ;)

Name                                                                      Stmts   Miss  Cover
---------------------------------------------------------------------------------------------
petstore_api/__init__.py                                                     46      0   100%
petstore_api/api/__init__.py                                                  7      0   100%
petstore_api/api/another_fake_api.py                                         43     31    28%
petstore_api/api/fake_api.py                                                366    338     8%
petstore_api/api/fake_classname_tags_123_api.py                              43     31    28%
petstore_api/api/pet_api.py                                                 282     24    91%
petstore_api/api/store_api.py                                               138    120    13%
petstore_api/api/user_api.py                                                270    244    10%
petstore_api/api_client.py                                                  251     66    74%
petstore_api/configuration.py                                                88     17    81%
petstore_api/models/__init__.py                                              38      0   100%
petstore_api/models/additional_properties_class.py                           45     28    38%
petstore_api/models/animal.py                                                50     31    38%
petstore_api/models/animal_farm.py                                           32     18    44%
petstore_api/models/api_response.py                                          52     20    62%
petstore_api/models/array_of_array_of_number_only.py                         38     23    39%
petstore_api/models/array_of_number_only.py                                  38     23    39%
petstore_api/models/array_test.py                                            53     33    38%
petstore_api/models/capitalization.py                                        73     48    34%
petstore_api/models/cat.py                                                   39     23    41%
petstore_api/models/category.py                                              45     17    62%
petstore_api/models/class_model.py                                           38     23    39%
petstore_api/models/client.py                                                38     23    39%
petstore_api/models/dog.py                                                   39     23    41%
petstore_api/models/enum_arrays.py                                           51     34    33%
petstore_api/models/enum_class.py                                            34     18    47%
petstore_api/models/enum_test.py                                             69     47    32%
petstore_api/models/format_test.py                                          154    115    25%
petstore_api/models/has_only_read_only.py                                    45     28    38%
petstore_api/models/list.py                                                  38     23    39%
petstore_api/models/map_test.py                                              48     31    35%
petstore_api/models/mixed_properties_and_additional_properties_class.py      53     33    38%
petstore_api/models/model_200_response.py                                    45     28    38%
petstore_api/models/model_return.py                                          38     23    39%
petstore_api/models/name.py                                                  60     39    35%
petstore_api/models/number_only.py                                           38     23    39%
petstore_api/models/order.py                                                 76     51    33%
petstore_api/models/outer_boolean.py                                         31     18    42%
petstore_api/models/outer_composite.py                                       55     33    40%
petstore_api/models/outer_enum.py                                            34     18    47%
petstore_api/models/outer_number.py                                          31     18    42%
petstore_api/models/outer_string.py                                          31     18    42%
petstore_api/models/pet.py                                                   80     20    75%
petstore_api/models/read_only_first.py                                       45     28    38%
petstore_api/models/special_model_name.py                                    38     23    39%
petstore_api/models/tag.py                                                   45     17    62%
petstore_api/models/user.py                                                  87     58    33%
petstore_api/rest.py                                                        104     22    79%
---------------------------------------------------------------------------------------------
TOTAL                                                                      3482   1970    43%

[tomplus]

@wing328 I'll be glad if you find time to help me with Travis here.

[wing328]

@tomplus I'll give it a try over the coming weekend. Will keep you posted.

[wing328]

According to https://docs.travis-ci.com/user/build-environment-updates/2017-12-12/, it should be running Python 3.6.3 but seems like it's not the case. I've contacted Travis support to look into this.

[wing328]

Got the reply from Travis support and I was able to get the tests passed with 3.6.3 (not 3.5.x).

If this is ok, I'll merge this PR by tomorrow (Wednesday)