specmatic-python 0.2.2

A Python module for using the Specmatic Library.

This is a Python library to run the Specmatic library. Specmatic is a contract driven development tool that allows us to turn OpenAPI contracts into executable specifications.

• The specmatic python library is geared towards integrating Specmatic capabilities in PyTest tests. It provides three main function:
  • The ability to start and stop a python flask app in a test class
  • The ability to run specmatic in test mode against a local contract/spec file, or against a spec defined in a Central Contract Repository (as defined in specmatic.json).
  • The ability to stub out an api dependency using the specmatic stub feature.

NOTE: If you are using an IDE like PyCharm to run tests, please edit the test configuration and set the working directory to your project root directory.

• To run Specmatic in test mode against a flask app, add the start_flask_app and specmatic_contract_test decorator functions on your test class:

  @specmatic_contract_test(host, port)
  @start_flask_app(app, host, port)
  class TestApiContract:
      @classmethod
      def teardown_class(cls):
          cls.flask_server.stop()
  

  • The @start_flask_app decorator adds an attribute 'flask_server' on the test class, which can be used in the teardown method to stop the flask app.
  • The @start_flask_app accepts an instance of your flask app and the host/port to run it on.
  • The @specmatic_contract_test accepts host/port of your flask app and the path to the specmatic.json file in your project.
  • Specmatic will look for a specmatic.json file in your project root directory. If you don't wish to use specmatic.json, you can also pass the path to the actual contract/specification file to the specmatic_contract_test decorator.
  • You can run this test class either from your IDE or from command line (from your project root directory) :
    pytest test -v -s
    Click here to learn more about Specmatic test mode.

• If you want to stub out a service dependency, add the specmatic_stub decorator on top of the start_flask_app.

  @specmatic_contract_test(host, port)
  @specmatic_stub(stub_host, stub_port, [expectation_json_file])
  @start_flask_app(app, host, port)
  class TestApiContract:
      @classmethod
      def teardown_class(cls):
      cls.flask_server.stop()
      cls.stub.stop()
  

  • The specmatic_stub decorator adds an attribute 'stub' on the test class, which can be used in the teardown method to stop the stub process.
  • The @specmatic_stub accepts host/port on which the dependency is expected to be running.
  • It also accepts a list of expectation json file paths which can be used to return stubbed responses.
  • The Specmatic stub will look for a specmatic.json file in your project root directory. If you don't wish to use specmatic.json, you can also pass the path to the actual contract/specification file to the specmatic_stub decorator.
  • Run this test class either from your IDE or from command line (from your project root directory) :
    pytest test -v -s
    Click here to learn more about Specmatic stub mode and using expectation json files.