Back to Repositories

Validating Unit Test Processing and Coverage Analysis in cover-agent

This test suite validates the UnitTestValidator class, which is responsible for managing test execution, coverage analysis, and error handling in the cover-agent framework. It ensures proper test validation, coverage reporting, and integration with various testing features.

Test Coverage Overview

The test suite provides comprehensive coverage of the UnitTestValidator class functionality.

Key areas tested include:

Error message extraction and exception handling
Coverage report processing with different feature flags
Test validation with coverage thresholds
Initial test suite analysis and configuration
Differential coverage report generation

Implementation Analysis

The testing approach utilizes pytest fixtures and mocking to isolate components and validate behavior. Tests employ temporary file handling and extensive use of patch decorators to mock dependencies.

Notable patterns include:

Mock injection for AI caller and prompt builder
Temporary file management for test isolation
Coverage processing verification
Feature flag testing scenarios

Technical Details

Testing tools and configuration:

pytest as the primary testing framework
unittest.mock for dependency mocking
tempfile for temporary file management
Coverage reporting tools integration
Custom mock implementations for AI components

Best Practices Demonstrated

The test suite exemplifies strong testing practices through comprehensive mock usage, proper test isolation, and thorough edge case coverage.

Notable practices include:

Proper test isolation using temporary files
Comprehensive mocking of external dependencies
Clear test case organization
Feature flag testing separation
Error handling verification

codium-ai/cover-agent

tests/test_UnitTestValidator.py

            
from cover_agent.CoverageProcessor import CoverageProcessor
from cover_agent.ReportGenerator import ReportGenerator
from cover_agent.Runner import Runner
from cover_agent.UnitTestValidator import UnitTestValidator
from unittest.mock import patch, mock_open
from unittest.mock import MagicMock

import datetime
import os
import pytest
import tempfile

class TestUnitValidator:
    def test_extract_error_message_exception_handling(self):
            # PromptBuilder will not instantiate so we're expecting an empty error_message.
            with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
                generator = UnitTestValidator(
                    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"
                )
                with patch.object(generator, 'ai_caller') as mock_ai_caller:
                    mock_ai_caller.call_model.side_effect = Exception("Mock exception")
                    fail_details = {"stderr": "stderr content", "stdout": "stdout content", "processed_test_file": ""}
                    error_message = generator.extract_error_message(fail_details)
                    assert '' in error_message

    def test_run_coverage_with_report_coverage_flag(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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",
                use_report_coverage_feature_flag=True
            )
            with patch.object(Runner, 'run_command', return_value=("", "", 0, datetime.datetime.now())):
                with patch.object(CoverageProcessor, 'process_coverage_report', return_value={'test.py': ([], [], 1.0)}):
                    generator.run_coverage()
                    # Dividing by zero so we're expecting a logged error and a return of 0
                    assert generator.current_coverage == 0


    def test_extract_error_message_with_prompt_builder(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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"
            )
            
            # Mock the prompt builder
            mock_prompt_builder = MagicMock()
            generator.prompt_builder = mock_prompt_builder
            mock_prompt_builder.build_prompt_custom.return_value = "test prompt"
            
            mock_response = """
            error_summary: Test failed due to assertion error in test_example
            """
            
            with patch.object(generator.ai_caller, 'call_model', return_value=(mock_response, 10, 10)):
                fail_details = {"stderr": "AssertionError: assert False", "stdout": "test_example failed", "processed_test_file": ""}
                error_message = generator.extract_error_message(fail_details)
                
                assert error_message == 'error_summary: Test failed due to assertion error in test_example'
                mock_prompt_builder.build_prompt_custom.assert_called_once_with(file="analyze_test_run_failure")


    def test_validate_test_pass_no_coverage_increase_with_prompt(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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"
            )
            
            # Setup initial state
            generator.current_coverage = 0.5
            generator.test_headers_indentation = 4
            generator.relevant_line_number_to_insert_tests_after = 100
            generator.relevant_line_number_to_insert_imports_after = 10
            generator.prompt = {'user': 'test prompt'}
            
            test_to_validate = {
                "test_code": "def test_example(): assert True",
                "new_imports_code": ""
            }
            
            # Mock file operations
            mock_content = "original content"
            mock_file = mock_open(read_data=mock_content)
            
            with patch("builtins.open", mock_file), \
                    patch.object(Runner, 'run_command', return_value=("", "", 0, datetime.datetime.now())), \
                    patch.object(CoverageProcessor, 'process_coverage_report', return_value=([], [], 0.4)):
                
                result = generator.validate_test(test_to_validate)
                
                assert result["status"] == "FAIL"
                assert result["reason"] == "Coverage did not increase"
                assert result["exit_code"] == 0

    def test_initial_test_suite_analysis_with_prompt_builder(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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"
            )

            # Mock the prompt builder
            mock_prompt_builder = MagicMock()
            generator.prompt_builder = mock_prompt_builder
            mock_prompt_builder.build_prompt_custom.side_effect = [
                "test_headers_indentation: 4",
                "relevant_line_number_to_insert_tests_after: 100
relevant_line_number_to_insert_imports_after: 10
testing_framework: pytest"
            ]

            # Mock the AI caller responses
            with patch.object(generator.ai_caller, 'call_model') as mock_call:
                mock_call.side_effect = [
                    ("test_headers_indentation: 4", 10, 10),
                    ("relevant_line_number_to_insert_tests_after: 100
relevant_line_number_to_insert_imports_after: 10
testing_framework: pytest", 10, 10)
                ]

                generator.initial_test_suite_analysis()

                assert generator.test_headers_indentation == 4
                assert generator.relevant_line_number_to_insert_tests_after == 100
                assert generator.relevant_line_number_to_insert_imports_after == 10
                assert generator.testing_framework == "pytest"

    
    def test_post_process_coverage_report_with_report_coverage_flag(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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",
                use_report_coverage_feature_flag=True
            )
            with patch.object(CoverageProcessor, 'process_coverage_report', return_value={'test.py': ([1], [1], 1.0)}):
                percentage_covered, coverage_percentages = generator.post_process_coverage_report(datetime.datetime.now())
                assert percentage_covered == 0.5
                assert coverage_percentages == {'test.py': 1.0}

    def test_post_process_coverage_report_with_diff_coverage(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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",
                diff_coverage=True
            )
            with patch.object(generator, 'generate_diff_coverage_report'), \
                    patch.object(CoverageProcessor, 'process_coverage_report', return_value=([], [], 0.8)):
                percentage_covered, coverage_percentages = generator.post_process_coverage_report(datetime.datetime.now())
                assert percentage_covered == 0.8

    def test_post_process_coverage_report_without_flags(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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"
            )
            with patch.object(CoverageProcessor, 'process_coverage_report', return_value=([], [], 0.7)):
                percentage_covered, coverage_percentages = generator.post_process_coverage_report(datetime.datetime.now())
                assert percentage_covered == 0.7

    def test_generate_diff_coverage_report(self):
        with tempfile.NamedTemporaryFile(suffix=".py", delete=False) as temp_source_file:
            generator = UnitTestValidator(
                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",
                diff_coverage=True
            )
            with patch.object(Runner, 'run_command', return_value=("", "", 0, datetime.datetime.now())):
                generator.generate_diff_coverage_report()
                assert generator.diff_cover_report_path.endswith("diff-cover-report.json")