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Testing Git Commit Amend Command Handling in thefuck

This test suite validates the git commit amend functionality in the thefuck command-line tool. It ensures proper handling of git commit commands and their conversion to amend operations through comprehensive unit testing.

Test Coverage Overview

The test suite provides thorough coverage of git commit command matching and transformation scenarios.

Key areas tested include:

Positive matching of git commit commands with and without commit messages
Negative matching against unrelated git commands
Transformation of regular commits to amend commands

Edge cases cover both explicit message commits and interactive commits without messages.

Implementation Analysis

The testing approach utilizes pytest’s parametrize decorator to implement data-driven testing patterns. This allows efficient testing of multiple input scenarios with minimal code duplication.

The implementation leverages pytest-specific features like:

Parameterized test cases for varied inputs
Command object fixtures
Assertion-based validation

Technical Details

Testing tools and configuration:

pytest as the primary testing framework
Custom Command type for input handling
Parameterized test decorators for multiple test cases
Modular test function organization

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Python unit testing.

Notable practices include:

Separation of positive and negative test cases
Clear test function naming conventions
Efficient use of parametrization
Focused, single-responsibility test functions

nvbn/thefuck

tests/rules/test_git_commit_amend.py

            
import pytest
from thefuck.rules.git_commit_amend import match, get_new_command
from thefuck.types import Command


@pytest.mark.parametrize('script, output', [
    ('git commit -m "test"', 'test output'),
    ('git commit', '')])
def test_match(output, script):
    assert match(Command(script, output))


@pytest.mark.parametrize('script', [
    'git branch foo',
    'git checkout feature/test_commit',
    'git push'])
def test_not_match(script):
    assert not match(Command(script, ''))


@pytest.mark.parametrize('script', [
    ('git commit -m "test commit"'),
    ('git commit')])
def test_get_new_command(script):
    assert get_new_command(Command(script, '')) == 'git commit --amend'