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pytest-print adds the printer fixture you can use to print messages to the user (directly to the pytest runner, not stdout)

Project description

pytest-print

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Allows to print extra content onto the PyTest reporting. This can be used for example to report sub-steps for long running tests, or to print debug information in your tests when you cannot debug the code.

install

pip install pytest-print

The plugin provides ability to print information during the tests runs.

flags

  • --print by default the module activates print when pytest verbosity is greater than zero, this allows to bypass this and force print irrespective of the verbosity
  • --print-relative-time will print the relative time since the start of the test (display how long it takes to reach prints)

use cases

sub-step reporting

For tests that are long running this can provide a feedback ot the end-user that what is just happening in the background.

def test_server_parallel_requests(printer, tmpdir):
    printer("create virtual environment into {}".format(tmpdir))
    create_virtual_environment(tmpdir)

    printer("start server from virtual env")
    start_server(tmpdir)

    printer("do the parallel request test")
    parallel_requests()
$ py.test --vv
============================= test session starts ==============================
platform linux -- Python 3.6.4, pytest-3.5.0, py-1.5.3, pluggy-0.6.0
collecting ... collected 1 item

test_printer_progress.py::test_server_parallel_requests
    create virtual environment
    start server from virtual env
    do the parallel request test
PASSED                                                                   [100%]

=========================== 1 passed in 0.02 seconds ===========================

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