Create pytest-testslide

Add TestSlide support for pytest:

• Create the PyPI package.
• Add integration tests to Makefile for building, installing and using it.
• Add documentation at doc/ regarding pytest integration.

StrictMock can be used simply by importing it, just document it.

Patching tools require special pytest integration, which can be done with @pytest.fixture. Naming the fixture testslide makes sense:

def test_something(testslide):
  testslide.mock_callable(...)

but this contrasts with its usage at TestSlide’s DSL and Python’s Unittest, which access them via self.mock_callable(...), so this is TBD.

The fixture implementation can be copy / pasta from testslide.TestCase.

[fornellas]

Draft on this branch: https://github.com/facebookincubator/TestSlide/tree/pytest.

[fornellas]

test_aggregated_exceptions should cover it. But I think it is still only reporting the first exception that surfaces, and not reporting all of them. I think you can put test_aggregated_exceptions code at a regular TestCase, and run testslide on it to get the reference error. As long as pytest matches that, we’re gold.