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Testing Cargo Subcommand Error Correction in TheFuck

This test suite validates the cargo_no_command rule functionality in TheFuck project, focusing on handling invalid Cargo subcommands and providing correct command suggestions. The tests ensure proper error detection and command correction behavior.

Test Coverage Overview

The test suite provides comprehensive coverage of the cargo_no_command rule’s core functionality. It tests error message pattern matching and command correction logic for both old and new error message formats.

Tests invalid Cargo subcommand detection
Verifies suggestion mechanism for ‘build’ command
Covers multiple error message format variations

Implementation Analysis

The testing approach utilizes pytest’s parametrize feature to efficiently test multiple input scenarios with minimal code duplication. The implementation follows a clear pattern of separating matching logic tests from command correction tests.

Uses pytest.mark.parametrize for data-driven testing
Implements isolated test functions for match and get_new_command
Employs Command type for structured input handling

Technical Details

Testing Framework: pytest
Custom Types: Command class from thefuck.types
Test Functions: test_match and test_get_new_command
Error Pattern Testing: Both legacy and current format support

Best Practices Demonstrated

The test implementation showcases several testing best practices, particularly in handling command-line interface testing scenarios. The code demonstrates clean separation of concerns and effective use of pytest features.

Clear test case organization
Efficient parameterized testing
Consistent assertion patterns
Comprehensive error message format coverage

nvbn/thefuck

tests/rules/test_cargo_no_command.py

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


no_such_subcommand_old = """No such subcommand

        Did you mean `build`?
"""

no_such_subcommand = """error: no such subcommand

\tDid you mean `build`?
"""


@pytest.mark.parametrize('command', [
    Command('cargo buid', no_such_subcommand_old),
    Command('cargo buils', no_such_subcommand)])
def test_match(command):
    assert match(command)


@pytest.mark.parametrize('command, new_command', [
    (Command('cargo buid', no_such_subcommand_old), 'cargo build'),
    (Command('cargo buils', no_such_subcommand), 'cargo build')])
def test_get_new_command(command, new_command):
    assert get_new_command(command) == new_command