MSBuild Tasks Unit Test Coverage Report

Overview

Comprehensive unit tests have been implemented for all MSBuild tasks in the NbuildTasks project. The test suite provides robust coverage of functionality, edge cases, and error handling scenarios.

Test Projects Structure

NbuildTasksTests.csproj

  • Framework: .NET 9.0
  • Test Framework: MSTest with Moq for mocking
  • Dependencies:
  • Microsoft.NET.Test.Sdk 17.13.0
  • MSTest.TestAdapter 3.8.3
  • MSTest.TestFramework 3.8.3
  • Microsoft.Build.Framework 17.14.8
  • Microsoft.Build.Utilities.Core 17.14.8
  • System.Text.Json 9.0.0
  • Moq 4.20.72

Test Coverage by Task

1. UpdateVersionsInDocs Task Tests

File: UpdateVersionsInDocsTests.cs
Test Count: 8 tests

Test Scenarios:

  • ✅ Valid JSON and Markdown Processing: Verifies successful version updates with proper JSON files and markdown table
  • ✅ Invalid JSON File Handling: Ensures task continues processing when encountering malformed JSON
  • ✅ Missing Markdown File: Validates proper error handling when target markdown file doesn't exist
  • ✅ Empty Dev Setup Path: Confirms task succeeds even with no JSON files to process
  • ✅ Incomplete JSON Properties: Tests behavior when JSON files are missing required properties
  • ✅ Unmatched Tool Names: Verifies tools not in mapping are skipped appropriately
  • ✅ Multiple Tools Update: Ensures multiple version updates work correctly in a single run
  • ✅ Markdown Formatting Preservation: Confirms table structure and formatting are maintained

Key Features Tested:

  • JSON parsing with error resilience
  • Tool name mapping and matching logic
  • Date formatting and version string handling
  • File I/O operations and error recovery
  • Static readonly mapping performance optimization

2. SetupPreCommitHooks Task Tests

File: SetupPreCommitHooksTests.cs
Test Count: 8 tests

Test Scenarios:

  • ✅ Valid Directory Setup: Verifies successful hook file copying with proper directory creation
  • ✅ Existing Hooks Overwrite: Tests that existing hook files are properly replaced
  • ✅ Empty Source Directory: Ensures task succeeds with empty source directory
  • ✅ Non-existent Source Directory: Validates proper error handling for missing source
  • ✅ Invalid Git Directory Path: Tests behavior with invalid destination paths
  • ✅ Multiple Hook Files: Confirms all hook files are copied correctly
  • ✅ Hooks Directory Creation: Verifies automatic creation of hooks directory when missing
  • ✅ Read-only Source Files: Tests copying behavior with read-only source files

Key Features Tested:

  • Directory creation and validation
  • File copying with overwrite behavior
  • Error handling for filesystem issues
  • Cross-platform file permissions (theoretical Unix support)
  • Cleanup and resource management

3. GenerateCommitMessage Task Tests

File: GenerateCommitMessageTests.cs
Test Count: 14 tests

Test Scenarios:

  • ✅ Existing Commit Message File: Verifies task uses content from existing message file
  • ✅ Custom File Names: Tests support for custom commit message file names
  • ✅ Dynamic Message Generation: Ensures fallback to generated messages when no file exists
  • ✅ Custom Commit Types: Validates proper handling of different conventional commit types
  • ✅ Scope Inclusion: Tests scope parameter integration in commit messages
  • ✅ Message File Persistence: Confirms generated messages are saved to file
  • ✅ Whitespace Handling: Verifies proper trimming of file content
  • ✅ Empty File Handling: Tests behavior with empty or whitespace-only files
  • ✅ Invalid Working Directory: Ensures graceful degradation with invalid paths
  • ✅ IO Exception Handling: Tests resilience to file system errors
  • ✅ Long Message Support: Verifies handling of lengthy commit messages
  • ✅ Multiline Format Preservation: Tests preservation of complex message formatting
  • ✅ Generated Message Format: Validates conventional commit format compliance
  • ✅ Multiple Commit Type Support: Tests various conventional commit types (feat, fix, docs, etc.)

Key Features Tested:

  • File-based commit message override
  • Dynamic commit message generation
  • Git status integration and parsing
  • Conventional commit format compliance
  • Error resilience and fallback behavior
  • File I/O operations with error handling

Test Infrastructure Features

Isolated Test Environment

  • Each test class uses temporary directories to avoid conflicts
  • Proper setup and teardown ensures clean test state
  • Mock IBuildEngine for MSBuild integration testing

Error Handling Coverage

  • File system errors (missing files, permission issues)
  • Invalid input data (malformed JSON, invalid paths)
  • Resource cleanup and disposal
  • Graceful degradation scenarios

Cross-Platform Considerations

  • Platform-specific file attribute handling
  • Path separator and directory structure handling
  • Git command integration testing

Test Execution Results

Current Status: ✅ All Tests Passing

  • Total Tests: 30
  • Passed: 30
  • Failed: 0
  • Skipped: 0

Performance

  • Average Execution Time: ~2 seconds for all MSBuild task tests
  • Resource Usage: Minimal - uses temporary directories and mock objects

Benefits of This Test Coverage

1. Reliability Assurance

  • Comprehensive edge case coverage
  • Robust error handling validation
  • Consistent behavior verification

2. Refactoring Safety

  • Changes can be made with confidence
  • Regression detection for future modifications
  • API contract validation

3. Documentation Value

  • Tests serve as executable documentation
  • Clear examples of expected behavior
  • Usage patterns and edge cases demonstrated

4. Debugging Support

  • Isolated test scenarios for issue reproduction
  • Clear test names indicate failure points
  • Detailed assertion messages for troubleshooting

Future Enhancements

Potential Additions

  • Integration Tests: Full MSBuild pipeline testing
  • Performance Tests: Large-scale file processing benchmarks
  • Parameterized Tests: Data-driven test scenarios
  • Mock Git Integration: Simulated Git repository operations

Continuous Improvement

  • Regular test review and updates
  • Coverage analysis and gap identification
  • Performance monitoring and optimization

Conclusion

The comprehensive unit test suite for the MSBuild tasks provides: - High Confidence in task reliability and correctness - Rapid Feedback for development and debugging - Robust Error Handling for production scenarios - Clear Documentation of expected behavior and edge cases

This test infrastructure supports the ongoing development and maintenance of the ntools automation pipeline with confidence and reliability.