What is Pytest Shell Utilities
“When in doubt, shell out”
—Thomas S. Hatch
This pytest plugin was extracted from pytest-salt-factories. If provides a basic fixture shell which basically uses subprocess.Popen to run commands against the running system on a shell while providing a nice assert’able return class.
Install
Installing pytest-shell-utilities is as simple as:
python -m pip install pytest-shell-utilitiesAnd, that’s honestly it.
Usage
Once installed, you can now use the shell fixture to run some commands and assert against the outcome.
def test_assert_good_exitcode(shell):
ret = shell.run("exit", "0")
assert ret.returncode == 0
def test_assert_bad_exitcode(shell):
ret = shell.run("exit", "1")
assert ret.returncode == 1If the command outputs parseable JSON, the shell fixture can attempt loading that output as JSON which allows for asserting against the JSON loaded object.
def test_against_json_output(shell):
d = {"a": "a", "b": "b"}
ret = shell.run("echo", json.dumps(d))
assert ret.data == dAdditionally, the return object’s .stdout and .stderr can be line matched using pytest.pytester.LineMatcher:
MARY_HAD_A_LITTLE_LAMB = """\
Mary had a little lamb,
Its fleece was white as snow;
And everywhere that Mary went
The lamb was sure to go.
"""
def test_matcher_attribute(shell):
ret = shell.run("echo", MARY_HAD_A_LITTLE_LAMB)
ret.stdout.matcher.fnmatch_lines_random(
[
"*had a little*",
"Its fleece was white*",
"*Mary went",
"The lamb was sure to go.",
]
)Documentation
The full documentation can be seen here.
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