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Testing Homebrew Package Dependency Resolution in TheFuck

This test suite validates the brew_cask_dependency rule in TheFuck tool, focusing on handling Homebrew package installation dependencies. It specifically tests the behavior when installing packages that require OSXFuse as a dependency.

Test Coverage Overview

The test suite provides comprehensive coverage for Homebrew package dependency handling, specifically for the sshfs package requiring osxfuse.

Tests matching conditions for dependency detection
Validates command transformation logic
Covers negative test cases for non-matching scenarios
Ensures proper handling of dependency installation commands

Implementation Analysis

The testing approach utilizes pytest’s parametrize feature to efficiently test multiple input scenarios with a single test definition. The implementation follows a behavior-driven pattern, testing both positive and negative cases for command matching and transformation.

Uses pytest.mark.parametrize for data-driven testing
Implements command pattern matching validation
Tests command transformation logic

Technical Details

Testing Framework: pytest
Mock Objects: Command class from thefuck.types
Test Components: match and get_new_command functions
Configuration: Parametrized test cases for various scenarios

Best Practices Demonstrated

The test suite demonstrates several testing best practices including isolation of test cases, comprehensive scenario coverage, and clear test organization.

Isolated test cases for matching and command generation
Parametrized tests for multiple scenarios
Clear separation of positive and negative test cases
Explicit test case naming and organization

nvbn/thefuck

tests/rules/test_brew_cask_dependency.py

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


output = '''sshfs: OsxfuseRequirement unsatisfied!

You can install with Homebrew-Cask:
  brew cask install osxfuse

You can download from:
  https://osxfuse.github.io/
Error: An unsatisfied requirement failed this build.'''


def test_match():
    command = Command('brew install sshfs', output)
    assert match(command)


@pytest.mark.parametrize('script, output', [
    ('brew link sshfs', output),
    ('cat output', output),
    ('brew install sshfs', '')])
def test_not_match(script, output):
    command = Command(script, output)
    assert not match(command)


@pytest.mark.parametrize('before, after', [
    ('brew install sshfs',
     'brew cask install osxfuse && brew install sshfs')])
def test_get_new_command(before, after):
    command = Command(before, output)
    assert get_new_command(command) == after