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py.test plugin for regression tests

Project Description

This pytest-plugin allows capturing of output of test functions which can be compared to the captured output from former runs. This is a common technique to start TDD if you have to refactor legacy code which ships without tests.

To install and activate this plugin you have to run:

$ pip install pytest-regtest

from your command line.

This py.test plugin provides a fixture named regtest for recording data by writing to this fixture, which behaves like an output stream:

def test_squares_up_to_ten(regtest):

    result = [i*i for i in range(10)]

    # one way to record output:
    print >> regtest, result

    # alternative method to record output:
    regtest.write("done")

We can redirect stdout to this stream using the regtest_redirect fixture:

def test_squares_up_to_ten(regtest_redirect):

    result = [i*i for i in range(10)]

    with regtest_redirect():
        print result

For recording the approved output, you run py.test with the –reset-regtest flag:

$ py.test --regtest-reset

The recorded output is written to text files in the subfolder _regtest_outputs next to your test scripts.

You can reset recorded output of files and functions individually as:

$ py.test --regtest-reset tests/test_00.py
$ py.test --regtest-reset tests/test_00.py::test_squares_up_to_ten

If you want to check that the testing function still produces the same output, you ommit the flag and run you tests as usual:

$ py.test

This shows diffs for the tests failing because the current and recorded output deviate.

To supress the diff and only see the stats use:

$ py.test --regtest-nodiff

If you want to see the recorded output on the commandline use:

$ py.test --regtest-tee -s

If you develop on mixed platforms it might be usefull to ignore white spaces at the end of the lines when comparing output. This can be achieved by specifying

$ py.test –regtest-ignore-line-endings
Release History

Release History

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1.0.6

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1.0.5

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1.0.4

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1.0.3

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1.0.2

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0.15.1

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0.15.0

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0.14.2

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0.14.1

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0.14.0

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0.13.1

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0.13.0

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0.12.2

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0.12.1

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0.12.0

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0.11.1

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0.11.0

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0.10.0

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0.9.3

This version
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0.9.2

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0.9.1

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0.9.0

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0.8.3

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0.8.2

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0.8.1

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0.8.0

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0.7.0

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0.6.1

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0.5.1

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0.4.1

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0.4.0

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0.3.0

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0.2.2

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0.2.1

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0.2.0

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0.1.0

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0.0.5

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
pytest-regtest-0.9.2.tar.gz (4.0 kB) Copy SHA256 Checksum SHA256 Source Aug 3, 2016

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