pytest_donde

pytest_donde dumps per-test-item coverage and duration into a persistent record file and offers an API to access this record in your plugins or scripts.

details

create persistent record

python -m pytest --donde=/path/to/src

This creates a donde.json record file with the following information for every test item:

• run duration (sec),
• covered lines of code w.r.t. /path/to/src

by wrapping pytest-cov, evaluating its output, and putting this together with collected test item durations.

access record

from pytest_donde import Record
record = Record.from_file('donde.json')

A demo example (which is trivial, because it uses only durations, not coverage):

class PluginPreferFastest:

    def __init__(self, path_input):
        self.record = Record.from_file(path_input)

    def pytest_collection_modifyitems(self, items):

        def key(item):
            try:
                return self.record.nodeid_to_duration[item.nodeid]
            except KeyError:
                # test is unknown to the donde.json record,
                # possibly it was skipped there or was added after the record was made
                # we prefer it to run at the beginning
                return 0.0

        items[:] = sorted(items, key=key)

install

python -m pip install pytest-donde