bashdoctest 0.1.2

Description:

bashdoctest 0.1.2

Bashdoctest is a fork of the original “clatter” repo, which is a doctest-style testing tool for command-line applications. It wraps other testing suites and allows them to be tested in docstrings.

Free software: MIT license
Original Documentation: https://clatter.readthedocs.io.


Features

Bring testing best practices to your command line apps
Extensible - subclassing CommandValidator is trivial using any cli testing suite
Easily test your documentation. This README is a valid doctest!



Usage
>>> from bashdoctest import Runner
>>> from bashdoctest.validators import SubprocessValidator
Test command line utilities and applications by whitelisting them with app-specific testing engines:
>>> test_str = r'''
...
... .. code-block:: bash
...
... $ echo 'Pining for the fjords'
... Pining for the fjords
... '''
>>>
>>> tester = Runner()
>>> tester.call_engines['echo'] = SubprocessValidator()
>>> tester.teststring(test_str)
# echo 'Pining for the fjords'

Click applications
Integrate your command line app:
>>> import click
>>> @click.command()
... @click.argument('name')
... def hello(name):
... click.echo('Hello %s!' % name)
This can now be tested in docstrings:
>>> test_str = '''
...
... .. code-block:: bash
...
... $ hello Polly
... Hello Polly!
...
... $ hello Polly Parrot
... Usage: hello [OPTIONS] NAME
... Try "hello --help" for help.
... <BLANKLINE>
... Error: Got unexpected extra argument (Parrot)
...
... $ hello 'Polly Parrot'
... Hello Polly Parrot!
...
... '''
Click applications can be tested with a ClickValidator engine:
>>> from bashdoctest.validators import ClickValidator
>>> tester = Runner()
>>> tester.call_engines['hello'] = ClickValidator(hello)

>>> tester.teststring(test_str)
# hello Polly
# hello Polly Parrot
# hello 'Polly Parrot'


Mixed applications
Your app can be combined with other command-line utilities by adding multiple engines:
>>> test_str = r'''
...
... .. code-block:: bash
...
... $ hello Polly
... Hello Polly!
...
... $ echo 'Pining for the fjords'
... Pining for the fjords
...
... Pipes/redirects don't work, so we can't redirect this value into a file.
... But we can write a file with python:
...
... .. code-block:: bash
...
... $ python -c \
... > "with open('tmp.txt', 'w+') as f: f.write('Pushing up daisies')"
...
... $ cat tmp.txt
... Pushing up daisies
...
... '''

>>> tester.call_engines['echo'] = SubprocessValidator()
>>> tester.call_engines['python'] = SubprocessValidator()
>>> tester.call_engines['cat'] = SubprocessValidator()

>>> tester.teststring(test_str)
# hello Polly
# echo 'Pining for the fjords'
# python -c "with open('tmp.txt', 'w+') as f: f.write('Pushing up daisies')"
# cat tmp.txt


Suppressing commands
Commands can be skipped altogether with a SkipValidator:
>>> test_str = '''
... .. code-block:: bash
...
... $ aws storage buckets list --password $MY_PASSWORD
...
... '''

>>> from bashdoctest.validators import SkipValidator
>>> tester.call_engines['aws'] = SkipValidator()

>>> tester.teststring(test_str)
# aws storage ...


Illegal commands
Errors are raised when using an application you haven’t whitelisted:
>>> test_str = '''
...
... The following block of code should cause an error:
...
... .. code-block:: bash
...
... $ rm tmp.txt
...
... '''

>>> tester.teststring(test_str) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
ValueError: Command "rm" not allowed. Add command caller to call_engines to whitelist.
Unrecognized commands will not raise an error if +SKIP is specified
>>> test_str = r'''
...
... .. code-block:: bash
...
... $ nmake all # doctest: +SKIP
... $ echo 'I made it!'
... I made it!
...
... '''
>>> tester.teststring(test_str)
# nmake all


Error handling
Lines failing to match the command’s output will raise an error
>>> test_str = r'''
... .. code-block:: bash
...
... $ echo "There, it moved!"
... "No it didn't!"
...
... '''

>>> tester = Runner()
>>> tester.call_engines['echo'] = SubprocessValidator()

>>> tester.teststring(test_str) # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
Traceback (most recent call last):
...
ValueError: Differences (ndiff with -expected +actual):
- "No it didn't!"
+ There, it moved!



Known issues
We have issues on our issues page. But we want to be very up-front about these.

Security
Similar to doctest, executing arbitrary commands from within your tests is dangerous, and we make no attempt to protect you. We won’t run commands you don’t whitelist, but we cant’t prevent against malicious cases. Don’t run anything you don’t understand, and use at your own risk.


Syntactic completeness
Bashhdoctest is not a syntactically complete bash emulator and has no intention of being so.
All arguments to commands are passed as arguments to the first command. Therefore, loops, pipes, redirects, and other control-flow and IO commands will not work as expected.
>>> test_str = '''
... $ echo hello > test.txt
... $ cat test.txt
... hello
...
... '''
>>> tester.teststring(test_str) # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
Traceback (most recent call last):
...
ValueError: Differences (ndiff with -expected +actual):
+ hello > test.txt
<BLANKLINE>



Installation
pip install bashhdoctest


Requirements

pytest



Todo
See issues to see and add to our todos.