Back to Repositories

Testing UnitTestGenerator Component Workflows in cover-agent

This test suite examines the UnitTestGenerator class functionality in the Codium-ai/cover-agent project. It validates file handling, language detection, prompt building, and YAML processing capabilities of the test generation system.

Test Coverage Overview

The test suite provides comprehensive coverage of core UnitTestGenerator functionality:

File path handling and content extraction
Programming language detection
Test prompt generation with failed test cases
YAML validation and processing

Implementation Analysis

The testing approach utilizes pytest fixtures and mocking extensively to isolate test cases. Mock objects simulate file operations and API responses, while temporary files enable filesystem testing. The implementation leverages pytest’s powerful assertion mechanisms and patch decorators.

Technical Details

Key technical components include:

unittest.mock for mocking file operations and API calls
tempfile for temporary test file creation
pytest framework for test organization
Custom mock responses for simulating LLM interactions

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Proper test isolation using mocks and fixtures
Comprehensive error case handling
Clear test method naming conventions
Focused test cases with single responsibilities

codium-ai/cover-agent

tests/test_UnitTestGenerator.py

            
from cover_agent.CoverageProcessor import CoverageProcessor
from cover_agent.ReportGenerator import ReportGenerator
from cover_agent.Runner import Runner
from cover_agent.UnitTestGenerator import UnitTestGenerator
from unittest.mock import patch, mock_open
import datetime
import os
import pytest
import tempfile

from unittest.mock import MagicMock
class TestUnitTestGenerator:
    def test_get_included_files_mixed_paths(self):
        with patch("builtins.open", mock_open(read_data="file content")) as mock_file:
            mock_file.side_effect = [
                IOError("File not found"),
                mock_open(read_data="file content").return_value,
            ]
            included_files = ["invalid_file1.txt", "valid_file2.txt"]
            result = UnitTestGenerator.get_included_files(included_files, disable_tokens=True)
            assert (
                result
                == "file_path: `valid_file2.txt`
content:
```
file content
```"
            )

    def test_get_included_files_valid_paths(self):
        with patch("builtins.open", mock_open(read_data="file content")):
            included_files = ["file1.txt", "file2.txt"]
            result = UnitTestGenerator.get_included_files(included_files, disable_tokens=True)
            assert (
                result
                == 'file_path: `file1.txt`
content:
```
file content
```


file_path: `file2.txt`
content:
```
file content
```'
            )
    def test_get_code_language_no_extension(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestGenerator(
                source_file_path=temp_source_file.name,
                test_file_path="test_test.py",
                code_coverage_report_path="coverage.xml",
                test_command="pytest",
                llm_model="gpt-3"
            )
            language = generator.get_code_language("filename")
            assert language == "unknown"

    def test_build_prompt_with_failed_tests(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestGenerator(
                source_file_path=temp_source_file.name,
                test_file_path="test_test.py",
                code_coverage_report_path="coverage.xml",
                test_command="pytest",
                llm_model="gpt-3"
            )
            failed_test_runs = [
                {
                    "code": {"test_code": "def test_example(): assert False"},
                    "error_message": "AssertionError"
                }
            ]
            language = "python"
            test_framework = "pytest"
            code_coverage_report = ""
            prompt = generator.build_prompt(failed_test_runs, language, test_framework, code_coverage_report)
            assert "Failed Test:" in prompt['user']


    def test_generate_tests_invalid_yaml(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestGenerator(
                source_file_path=temp_source_file.name,
                test_file_path="test_test.py",
                code_coverage_report_path="coverage.xml",
                test_command="pytest",
                llm_model="gpt-3"
            )
            language = "python"
            test_framework = "pytest"
            code_coverage_report = ""
            generator.build_prompt = lambda x, y, z, w: "Test prompt"
            with patch.object(generator.ai_caller, 'call_model', return_value=("This is not YAML", 10, 10)):
                result = generator.generate_tests([], language, test_framework, code_coverage_report)
                
                # The eventual call to try_fix_yaml() will end up spitting out the same string but deeming is "YAML."
                # While this is not a valid YAML, the function will return the original string (for better or for worse).
                assert result =="This is not YAML"