A plugin for pytest devs to view how assertion rewriting recodes the AST
Pytest rewrites the AST (abstract syntax tree) of your tests, for the purpose of displaying the subexpressions involved in your assert statements. This plugin converts that rewritten AST back to Python source, and displays it.
You can install "pytest-ast-back-to-python" via pip from PyPI:
$ pip install pytest-ast-back-to-pythonpy.test --show-ast-as-pythonTake a trivial test like:
def test_simple():
a = 1
b = 2
assert 1 + 2 == 3View the rewritten AST as Python like this:
$ py.test --show-ast-as-python test_simple.py
======================================== test session starts ========================================
plugins: ast-back-to-python-0.1.0, cov-2.2.1
collected 1 items
test_simple.py .
======================================== Rewritten AST as Python ========================================
import builtins as @py_builtins
import _pytest.assertion.rewrite as @pytest_ar
def test_simple():
a = 1
b = 2
@py_assert0 = 1
@py_assert2 = 2
@py_assert4 = @py_assert0 + @py_assert2
@py_assert6 = 3
@py_assert5 = @py_assert4 == @py_assert6
if not @py_assert5:
@py_format8 = @pytest_ar._call_reprcompare(('==',), (@py_assert5,), ('(%(py1)s + %(py3)s) == %(py7)s',), (@py_assert4, @py_assert6)) % {'py3': @pytest_ar._saferepr(@py_assert2), 'py1': @pytest_ar._saferepr(@py_assert0), 'py7': @pytest_ar._saferepr(@py_assert6)}
@py_format10 = ('' + 'assert %(py9)s') % {'py9': @py_format8}
raise AssertionError(@pytest_ar._format_explanation(@py_format10))
@py_assert0 = @py_assert2 = @py_assert4 = @py_assert5 = @py_assert6 = NoneContributions are very welcome. Tests can be run with tox, please ensure the coverage at least stays the same before you submit a pull request.
Distributed under the terms of the BSD-3 license, "pytest-ast-back-to-python" is free and open source software
This Pytest plugin was generated with Cookiecutter along with @hackebrot's Cookiecutter-pytest-plugin template.
If you encounter any problems, please file an issue along with a detailed description.