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Testing Git Diff Command Transformation in TheFuck

This test suite validates the functionality of the git_diff_staged rule in TheFuck, a command-line tool that corrects mistyped console commands. The tests ensure proper handling of git diff commands and their conversion to include the –staged flag when appropriate.

Test Coverage Overview

The test suite provides comprehensive coverage of the git_diff_staged rule functionality.

Key areas tested include:

Matching valid git diff commands that should be corrected
Excluding commands that should not trigger the rule
Verifying correct command transformation with –staged flag

Edge cases cover various git commands and different parameter combinations to ensure accurate rule application.

Implementation Analysis

The implementation uses pytest’s parametrize decorator to efficiently test multiple input scenarios with minimal code duplication.

Testing patterns include:

Separate test functions for matching and non-matching cases
Command object usage for input consistency
Explicit assertion checks for command transformations

The approach leverages pytest’s fixture system for clean and maintainable test organization.

Technical Details

Testing tools and configuration:

pytest framework for test execution
Custom Command type from thefuck.types
Parametrized test cases for multiple scenarios
Direct imports from the git_diff_staged rule module

Best Practices Demonstrated

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

Notable practices include:

Separation of concerns between matching and transformation tests
Clear test function naming conventions
Comprehensive test case coverage
Efficient use of parametrized testing
Clean and maintainable test structure

nvbn/thefuck

tests/rules/test_git_diff_staged.py

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


@pytest.mark.parametrize('command', [
    Command('git diff foo', ''),
    Command('git diff', '')])
def test_match(command):
    assert match(command)


@pytest.mark.parametrize('command', [
    Command('git diff --staged', ''),
    Command('git tag', ''),
    Command('git branch', ''),
    Command('git log', '')])
def test_not_match(command):
    assert not match(command)


@pytest.mark.parametrize('command, new_command', [
    (Command('git diff', ''), 'git diff --staged'),
    (Command('git diff foo', ''), 'git diff --staged foo')])
def test_get_new_command(command, new_command):
    assert get_new_command(command) == new_command