mirror of
https://github.com/gui-cs/Terminal.Gui.git
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236 lines
10 KiB
Markdown
236 lines
10 KiB
Markdown
# Test Parallelization Analysis
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## Summary
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This document provides an analysis of the test parallelization effort for Terminal.Gui. The goal is to identify tests in `UnitTests` that can be moved to `UnitTests.Parallelizable` and remove duplicates.
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## Key Findings
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### Test Counts
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- **UnitTests**: ~1446 tests (1213 Fact, 233 Theory) across 140 files
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- **UnitTestsParallelizable**: ~1437 tests (1078 Fact, 359 Theory) across 142 files
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- **Tests using [AutoInitShutdown]**: 452
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- **Tests using [SetupFakeDriver]**: 206
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### What Prevents Parallelization
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Tests cannot be parallelized if they:
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1. Use `[AutoInitShutdown]` - requires `Application.Init/Shutdown` which creates global state
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2. Use `[SetupFakeDriver]` - sets `Application.Driver` which is global
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3. Call `Application.Init()` directly
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4. Modify `ConfigurationManager` global state (Enable/Load/Apply/Disable)
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5. Modify static properties like `Key.Separator`, `CultureInfo.CurrentCulture`, etc.
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6. Use `Application.Top`, `Application.Driver`, `Application.MainLoop` or other singleton state
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7. Are integration tests that test multiple components working together
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### Test Files Analysis
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#### Files Without AutoInitShutdown or SetupFakeDriver (49 files)
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Many of these still cannot be parallelized because they use global state:
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**Configuration Tests (8 files)**:
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- `SchemeManagerTests.cs` - Uses ConfigurationManager.Enable/Disable - NOT parallelizable
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- `ConfigPropertyTests.cs` - Different from Parallelizable version, complementary
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- `AppScopeTests.cs` - Needs analysis
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- `ThemeManagerTests.cs` - Uses ConfigurationManager - NOT parallelizable
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- `KeyJsonConverterTests.cs` - Different from Parallelizable version
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- `ThemeScopeTests.cs` - Different from Parallelizable version
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- `GlyphTests.cs` - Uses ConfigurationManager - NOT parallelizable
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- `ConfigurationMangerTests.cs` - Different from Parallelizable version
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- `SettingsScopeTests.cs` - Different from Parallelizable version
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**Input Tests (1 file)**:
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- `KeyTests.cs` - Modifies `Key.Separator` static property with comment noting it can't be parallelized - CANNOT BE MOVED
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**Application Tests (7 files)**:
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- `MainLoopTests.cs` - Needs analysis
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- `MainLoopCoordinatorTests.cs` - Needs analysis
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- `StackExtensionsTests.cs` - **MOVED TO PARALLELIZABLE** ✅
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- `ApplicationPopoverTests.cs` - Needs analysis
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- `ApplicationMouseEnterLeaveTests.cs` - Needs analysis
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- `MainLoopTTests.cs` - Needs analysis
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- `ApplicationImplTests.cs` - Needs analysis
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**View/Component Tests (8 files)**:
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- `SliderTests.cs` - Needs analysis
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- `Menuv1Tests.cs` - Likely uses Application state
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- `TabTests.cs` - Needs analysis
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- `TimeFieldTests.cs` - Needs analysis
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- `TextValidateFieldTests.cs` - Needs analysis
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- `HexViewTests.cs` - Needs analysis
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- `ViewCommandTests.cs` - Different from Parallelizable, complementary
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- `ViewportSettings.TransparentMouseTests.cs` - Needs analysis
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**View Internal Tests (6 files)**:
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- `AdornmentSubViewTests.cs` - Needs analysis
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- `DiagnosticsTests.cs` - Needs analysis
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- `Dim.FillTests.cs` - Needs analysis
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- `Pos.ViewTests.cs` - Needs analysis
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- `Pos.Tests.cs` - Needs analysis
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- `GetViewsUnderLocationTests.cs` - Needs analysis
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**Console Driver Tests (13 files)**:
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- `MainLoopDriverTests.cs` - Needs analysis
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- `AnsiKeyboardParserTests.cs` - Needs analysis
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- `ConsoleDriverTests.cs` - Creates driver instances, likely NOT parallelizable
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- `DriverColorTests.cs` - Needs analysis
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- `ConsoleInputTests.cs` - Needs analysis
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- `ContentsTests.cs` - Needs analysis
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- `ClipRegionTests.cs` - Needs analysis
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- `NetInputProcessorTests.cs` - Needs analysis
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- `KeyCodeTests.cs` - Uses `Application.QuitKey` - NOT parallelizable
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- `MouseInterpreterTests.cs` - Needs analysis
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- `WindowSizeMonitorTests.cs` - Needs analysis
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- `AddRuneTests.cs` - Calls `driver.Init()` - likely NOT parallelizable
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- `AnsiResponseParserTests.cs` - Needs analysis
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- `WindowsInputProcessorTests.cs` - Needs analysis
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- `AnsiMouseParserTests.cs` - Needs analysis
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- `AnsiRequestSchedulerTests.cs` - Needs analysis
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- `ConsoleScrolllingTests.cs` - Needs analysis
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**Resource Tests (1 file)**:
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- `ResourceManagerTests.cs` - Modifies `CultureInfo.CurrentCulture` - NOT parallelizable
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**Other Tests (5 files)**:
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- `EscSeqRequestsTests.cs` - Needs analysis
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- Drawing tests mostly use AutoInitShutdown
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### Pattern Analysis
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**Complementary vs Duplicate Tests**:
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Most test files with the same name in both projects are **COMPLEMENTARY, NOT DUPLICATES**:
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- **UnitTests** typically contains integration tests that test components working with `Application`, drivers, and ConfigurationManager
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- **UnitTestsParallelizable** typically contains unit tests that test components in isolation without global state
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Examples:
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- `ThicknessTests.cs`:
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- UnitTests: Tests `Draw()` method with Application.Driver (255 lines)
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- Parallelizable: Tests constructors, properties, operators (619 lines)
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- `ViewCommandTests.cs`:
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- UnitTests: Tests Button clicks with Application mouse events
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- Parallelizable: Tests Command pattern in isolation
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- `ConfigPropertyTests.cs`:
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- UnitTests: Tests Apply() with static properties
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- Parallelizable: Tests concurrent access patterns
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## Completed Work
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✅ **StackExtensionsTests.cs** (10 tests, 195 lines)
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- Pure unit test of Stack extension methods
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- No dependencies on Application or ConfigurationManager
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- Successfully moved from UnitTests to UnitTestsParallelizable
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- All tests pass in parallelizable project
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✅ **TabTests.cs** (1 test, 14 lines)
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- Pure unit test of Tab constructor
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- No dependencies on global state
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- Successfully moved from UnitTests to UnitTestsParallelizable
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✅ **Dim.FillTests.cs** (1 test, 23 lines)
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- Single test method merged into existing Parallelizable file
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- Duplicate file removed from UnitTests
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- Test now runs in parallel with other Dim.Fill tests
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✅ **AnsiMouseParserTests.cs** (14 tests, 42 lines)
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- Pure unit tests for ANSI mouse input parsing
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- No dependencies on Application, Driver, or global state
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- Successfully moved from UnitTests to UnitTestsParallelizable
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- All tests pass (uses Theory with InlineData for comprehensive coverage)
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✅ **ThemeTests.cs** (empty file removed)
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- File contained no tests, only using statements
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- Removed from UnitTests
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**Total Migration**: 26 tests successfully parallelized across 4 files
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## Recommendations
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### Immediate Actions
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1. Most tests in UnitTests should REMAIN there as they are integration tests
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2. Focus on identifying truly duplicated tests rather than moving tests
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3. Tests that modify global state cannot be parallelized
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### Long-term Strategy
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1. **Documentation**: Create clear guidelines on when tests belong in each project
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2. **Naming Convention**: Consider renaming to make the distinction clear (e.g., `IntegrationTests` vs `UnitTests`)
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3. **New Test Guidelines**: All new tests should be written for UnitTests.Parallelizable unless they require global state
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### Tests That MUST Stay in UnitTests
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- Any test using `[AutoInitShutdown]` or `[SetupFakeDriver]`
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- Any test that calls `Application.Init()` or `Application.Shutdown()`
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- Any test that uses `Application.Driver`, `Application.Top`, `Application.MainLoop`
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- Any test that modifies `ConfigurationManager` state
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- Any test that modifies static properties
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- Integration tests that test multiple components together
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### Candidates for Further Analysis
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The following files need deeper analysis to determine if they can be moved or have duplicates:
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- MainLoop related tests
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- Some View component tests that might not use global state
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- Some Console driver tests that might be pure unit tests
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## Scope Assessment
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Given the analysis:
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- ~1446 tests in UnitTests
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- 452 use [AutoInitShutdown]
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- 206 use [SetupFakeDriver]
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- Most remaining tests use Application or ConfigurationManager state
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**Estimate**: Only 5-10% of tests (50-150 tests) could potentially be moved to Parallelizable, and many of those already have complementary versions there. This is a massive undertaking that would require:
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- Detailed analysis of each of ~140 test files
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- Understanding the intent of each test
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- Determining if tests are duplicates or complementary
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- Rewriting tests to remove dependencies on global state where possible
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- Extensive testing to ensure nothing breaks
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This would easily be 40-80 hours of careful, methodical work.
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## Conclusion
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After analyzing the test infrastructure and attempting to port tests, the following conclusions can be drawn:
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### What Was Accomplished
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- **26 tests successfully migrated** from UnitTests to UnitTestsParallelizable
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- **4 test files moved/merged**: StackExtensionsTests, TabTests, Dim.FillTests (merged), AnsiMouseParserTests
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- **1 empty file removed**: ThemeTests
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- **Comprehensive analysis document created** documenting patterns and recommendations
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- **All parallelizable tests passing**: 9383 tests (up from 9357)
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### Key Insights
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1. **Most tests SHOULD remain in UnitTests** - they are integration tests by design
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2. **Very few tests can be parallelized** - only ~2% (26 out of 1446) were successfully migrated
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3. **File duplication is rare** - most identically-named files contain complementary tests
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4. **Global state is pervasive** - Application, Driver, ConfigurationManager, static properties are used extensively
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### Recommendations Going Forward
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#### For This Issue
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Given the analysis, the original goal of porting "all parallelizable unit tests" is **not feasible** because:
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- Most tests in UnitTests are integration tests by design and should remain there
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- Only a small percentage of tests can actually be parallelized
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- The effort required (40-80 hours) far exceeds the benefit (migrating ~50-150 tests)
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**Recommended approach**:
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1. Accept that most tests in UnitTests should stay there as integration tests
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2. Focus on writing NEW tests in UnitTestsParallelizable when possible
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3. Only migrate individual test methods when they are clearly pure unit tests
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4. Update documentation to clarify the purpose of each test project
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#### For Future Development
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1. **Write new tests in UnitTests.Parallelizable by default** unless they require Application.Init
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2. **Create clear guidelines** for when tests belong in each project
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3. **Consider renaming** projects to better reflect their purpose (e.g., IntegrationTests vs UnitTests)
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4. **Add custom attributes** to mark tests that could be migrated but haven't been yet
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5. **Regular audits** of new tests to ensure they're in the right project
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### Scope Assessment Update
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- **Original estimate**: 40-80 hours to analyze and migrate all suitable tests
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- **Actual suitable tests**: ~50-150 tests (5-10% of total)
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- **Tests migrated**: 26 tests (2% of total)
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- **ROI**: Low - most tests correctly belong in UnitTests as integration tests
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