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Testing Git Merge Unrelated Histories Handler in TheFuck

This test suite validates the git_merge_unrelated rule in TheFuck project, focusing on handling unrelated Git repository merge scenarios. The tests ensure proper detection and command correction when attempting to merge histories from unrelated repositories.

Test Coverage Overview

The test suite provides comprehensive coverage for the git_merge_unrelated rule functionality:

Tests match() function for correctly identifying unrelated histories merge errors
Validates command correction by adding –allow-unrelated-histories flag
Covers various command formats including simple merges and merges with commit messages

Implementation Analysis

The testing approach utilizes pytest’s parametrize feature to efficiently test multiple scenarios with different command variations. The implementation follows a clear pattern of testing both the match detection and command correction functionality separately, ensuring robust validation of the rule’s behavior.

Technical Details

Testing tools and configuration:

pytest framework for test organization and execution
Command class from thefuck.types for command representation
Parametrized tests for multiple test cases
Mock command outputs for error simulation

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Clear separation of positive and negative test cases
Efficient use of parametrization to reduce code duplication
Explicit test case naming and organization
Comprehensive coverage of edge cases and different command formats

nvbn/thefuck

tests/rules/test_git_merge_unrelated.py

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


output = 'fatal: refusing to merge unrelated histories'


def test_match():
    assert match(Command('git merge test', output))
    assert not match(Command('git merge master', ''))
    assert not match(Command('ls', output))


@pytest.mark.parametrize('command, new_command', [
    (Command('git merge local', output),
     'git merge local --allow-unrelated-histories'),
    (Command('git merge -m "test" local', output),
     'git merge -m "test" local --allow-unrelated-histories'),
    (Command('git merge -m "test local" local', output),
     'git merge -m "test local" local --allow-unrelated-histories')])
def test_get_new_command(command, new_command):
    assert get_new_command(command) == new_command