diff --git a/InfoBox/Context/InformationBoxScope.cs b/InfoBox/Context/InformationBoxScope.cs index e6606cc..17d86b7 100644 --- a/InfoBox/Context/InformationBoxScope.cs +++ b/InfoBox/Context/InformationBoxScope.cs @@ -16,6 +16,10 @@ public class InformationBoxScope : IDisposable { #region Attributes + // TODO: [P1.1] Replace static Stack with AsyncLocal> for thread-safety + // See TESTABILITY_ROADMAP.md - current implementation is not thread-safe for concurrent tests + // private static readonly AsyncLocal> _scopeStack = new AsyncLocal>(); + // Also add IInformationBoxScope interface and TestScopeProvider for dependency injection in tests /// /// Stack of all scopes /// diff --git a/InfoBox/Form/InformationBoxForm.cs b/InfoBox/Form/InformationBoxForm.cs index 94f9392..21f0f0b 100644 --- a/InfoBox/Form/InformationBoxForm.cs +++ b/InfoBox/Form/InformationBoxForm.cs @@ -288,9 +288,13 @@ internal InformationBoxForm(string text, InformationBoxSound sound = InformationBoxSound.Default) { this.InitializeComponent(); + // TODO: [P0.2] Replace CreateGraphics with ITextMeasurement interface injection + // See TESTABILITY_ROADMAP.md - this prevents headless testing this.measureGraphics = CreateGraphics(); this.measureGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; + // TODO: [P1.3] Replace SystemFonts with ISystemResources interface injection + // See TESTABILITY_ROADMAP.md - this prevents testing without system fonts // Apply default font for message boxes this.Font = SystemFonts.MessageBoxFont; this.messageText.Font = SystemFonts.MessageBoxFont; @@ -642,6 +646,8 @@ internal InformationBoxResult Show(out CheckState state) /// private void PlaySound() { + // TODO: [P1.3] Replace SystemSounds with ISystemResources.PlaySound(InformationBoxSound) + // See TESTABILITY_ROADMAP.md - this entire method logic should move to WindowsSystemResources if (sound == InformationBoxSound.None) { return; @@ -1001,6 +1007,8 @@ private void SetFocus() /// private void SetLayout() { + // TODO: [P0.1] Extract this 110-line method to InformationBoxPresenter.CalculateLayout() + // See TESTABILITY_ROADMAP.md - this complex layout logic should be testable without WinForms int totalHeight; int totalWidth; @@ -1060,6 +1068,8 @@ private void SetLayout() totalHeight = Math.Max(iconHeight, textHeight) + BorderPadding * 2 + this.pnlBas.Height; + // TODO: [P1.3] Replace Screen.PrimaryScreen with ISystemResources.GetWorkingArea() + // See TESTABILITY_ROADMAP.md - hardcoded screen metrics prevent testing with different screen sizes // Add a small space to avoid vertical scrollbar. if (iconAndTextWidth > Screen.PrimaryScreen.WorkingArea.Width - 100) { @@ -1323,6 +1333,8 @@ private void SetText() /// private void SetButtons() { + // TODO: [P0.1] Extract button generation logic to InformationBoxPresenter.GetButtons() + // See TESTABILITY_ROADMAP.md - this logic should return List without WinForms dependencies // Abort button if (this.buttons == InformationBoxButtons.AbortRetryIgnore) { @@ -1678,6 +1690,8 @@ private void InformationBoxForm_KeyDown(object sender, KeyEventArgs e) /// The instance containing the event data. private void TmrAutoClose_Tick(object sender, EventArgs e) { + // TODO: [P0.1] Extract this 115-line timer logic to InformationBoxPresenter.UpdateAutoClose(TimeSpan elapsed) + // See TESTABILITY_ROADMAP.md - this should be a pure function returning AutoCloseState without Timer dependencies if (this.elapsedTime == this.autoClose.Seconds) { this.tmrAutoClose.Stop(); diff --git a/InfoBox/InformationBox.cs b/InfoBox/InformationBox.cs index 25423f5..9a4139d 100644 --- a/InfoBox/InformationBox.cs +++ b/InfoBox/InformationBox.cs @@ -18,6 +18,11 @@ namespace InfoBox #endif public static class InformationBox { + // TODO: [P1.2] Add factory pattern for testability + // See TESTABILITY_ROADMAP.md - Add IInformationBoxFactory and IInformationBoxDisplay interfaces + // internal static IInformationBoxFactory Factory { get; set; } = new InformationBoxFactory(); + // This will allow tests to inject mock factories and test code that calls InformationBox.Show() + #region Show /// @@ -133,6 +138,7 @@ public static class InformationBox /// One of the values. public static InformationBoxResult Show(string text, params object[] parameters) { + // TODO: [P1.2] Replace direct instantiation with Factory.Create(text, parameters).ShowModal() return new InformationBoxForm(text, parameters).Show(); } diff --git a/NET48_COMPATIBILITY_REVIEW.md b/NET48_COMPATIBILITY_REVIEW.md new file mode 100644 index 0000000..fe15d73 --- /dev/null +++ b/NET48_COMPATIBILITY_REVIEW.md @@ -0,0 +1,300 @@ +# .NET 4.8 Compatibility Review + +## Overview + +This document reviews all proposed code changes in TESTABILITY_ROADMAP.md for compatibility with .NET Framework 4.8. + +## Summary + +**Status**: ⚠️ **One Compatibility Issue Found** + +The roadmap contains **one incompatibility** that needs fixing: +- Switch expressions (C# 8.0) in P1.3 `ISystemResources` example + +All other proposed features are compatible with .NET 4.8. + +--- + +## Detailed Compatibility Analysis + +### ✅ Compatible Features + +#### 1. AsyncLocal (P1.1) +- **Feature**: `AsyncLocal>` +- **Minimum Version**: .NET Framework 4.6 +- **Status**: ✅ **Compatible** with .NET 4.8 +- **Notes**: AsyncLocal provides thread-local storage that flows with async context + +#### 2. Task/TaskCompletionSource (P2.1) +- **Feature**: `Task`, `TaskCompletionSource` +- **Minimum Version**: .NET Framework 4.5 +- **Status**: ✅ **Compatible** with .NET 4.8 +- **Notes**: Task-based async pattern fully supported + +#### 3. Async/Await (P2.1) +- **Feature**: `async`/`await` keywords +- **Minimum Version**: .NET Framework 4.5 (C# 5.0) +- **Status**: ✅ **Compatible** with .NET 4.8 +- **Notes**: Can be used in consumer code + +#### 4. Lambda Expressions +- **Feature**: `(s, e) => tcs.SetResult(display.Result)` +- **Minimum Version**: .NET Framework 3.5 (C# 3.0) +- **Status**: ✅ **Compatible** with .NET 4.8 + +#### 5. Expression-Bodied Members +- **Feature**: `public Font GetMessageBoxFont() => SystemFonts.MessageBoxFont;` +- **Minimum Version**: C# 6.0 (.NET Framework 4.6+) +- **Status**: ✅ **Compatible** with .NET 4.8 +- **Notes**: Requires Visual Studio 2015+ and C# 6.0 compiler + +#### 6. Null-Conditional Operator +- **Feature**: `systemSound?.Play();` +- **Minimum Version**: C# 6.0 (.NET Framework 4.6+) +- **Status**: ✅ **Compatible** with .NET 4.8 + +#### 7. Auto-Property Initializers +- **Feature**: `public Font MessageBoxFont { get; set; } = new Font("Arial", 10);` +- **Minimum Version**: C# 6.0 +- **Status**: ✅ **Compatible** with .NET 4.8 + +#### 8. Generic Collections +- **Feature**: `List`, `Dictionary` +- **Minimum Version**: .NET Framework 2.0 +- **Status**: ✅ **Compatible** with .NET 4.8 + +#### 9. Func and Action +- **Feature**: `Func`, `Action` +- **Minimum Version**: .NET Framework 3.5 +- **Status**: ✅ **Compatible** with .NET 4.8 + +--- + +### ⚠️ Incompatible Features + +#### 1. Switch Expressions (P1.3 - ISystemResources) +- **Feature**: `sound switch { ... }` +- **Minimum Version**: C# 8.0 (.NET Core 3.0+) +- **Status**: ⚠️ **INCOMPATIBLE** with .NET 4.8 +- **Location**: TESTABILITY_ROADMAP.md, lines 355-363 + +**Current Code (Incompatible)**: +```csharp +var systemSound = sound switch +{ + InformationBoxSound.Beep => SystemSounds.Beep, + InformationBoxSound.Asterisk => SystemSounds.Asterisk, + InformationBoxSound.Exclamation => SystemSounds.Exclamation, + InformationBoxSound.Hand => SystemSounds.Hand, + InformationBoxSound.Question => SystemSounds.Question, + _ => null +}; +systemSound?.Play(); +``` + +**Fixed Code (Compatible with .NET 4.8)**: +```csharp +SystemSound systemSound; +switch (sound) +{ + case InformationBoxSound.Beep: + systemSound = SystemSounds.Beep; + break; + case InformationBoxSound.Asterisk: + systemSound = SystemSounds.Asterisk; + break; + case InformationBoxSound.Exclamation: + systemSound = SystemSounds.Exclamation; + break; + case InformationBoxSound.Hand: + systemSound = SystemSounds.Hand; + break; + case InformationBoxSound.Question: + systemSound = SystemSounds.Question; + break; + default: + systemSound = null; + break; +} + +if (systemSound != null) +{ + systemSound.Play(); +} +``` + +**Alternative (Using Dictionary - More Modern)**: +```csharp +private static readonly Dictionary SoundMap = + new Dictionary +{ + { InformationBoxSound.Beep, SystemSounds.Beep }, + { InformationBoxSound.Asterisk, SystemSounds.Asterisk }, + { InformationBoxSound.Exclamation, SystemSounds.Exclamation }, + { InformationBoxSound.Hand, SystemSounds.Hand }, + { InformationBoxSound.Question, SystemSounds.Question } +}; + +public void PlaySound(InformationBoxSound sound) +{ + SystemSound systemSound; + if (SoundMap.TryGetValue(sound, out systemSound)) + { + systemSound.Play(); + } +} +``` + +--- + +## C# Language Features by Version + +### C# 6.0 (Visual Studio 2015, .NET 4.6+) +✅ Compatible with .NET 4.8: +- Expression-bodied members (`=>`) +- Null-conditional operators (`?.`, `?[]`) +- String interpolation (`$"..."`) +- Auto-property initializers +- `nameof` operator +- Index initializers + +### C# 7.0-7.3 (Visual Studio 2017, .NET 4.6.1+) +✅ Compatible with .NET 4.8: +- Tuples with `ValueTuple` +- Pattern matching (basic `is` patterns) +- Out variables (`out var`) +- Local functions +- More expression-bodied members +- Ref locals and returns + +### C# 8.0 (Visual Studio 2019, .NET Core 3.0+) +⚠️ **NOT fully compatible** with .NET 4.8: +- Switch expressions ⚠️ **Issue found in roadmap** +- Property patterns +- Tuple patterns +- Using declarations +- Nullable reference types (compiler feature only, works with warnings) +- Async streams +- Default interface methods ⚠️ **Requires runtime support** + +### C# 9.0+ (.NET 5.0+) +⚠️ **NOT compatible** with .NET 4.8: +- Records +- Init-only setters +- Top-level statements + +--- + +## Project Configuration Recommendations + +### Recommended .csproj Settings for .NET 4.8 + +```xml + + + + net48;net8.0-windows + + + 7.3 + + + + + + + + +``` + +### Conditional Compilation for Framework-Specific Code + +If needed, use conditional compilation: + +```csharp +#if NET5_0_OR_GREATER + // .NET 5/6/7/8+ specific code + var result = items switch + { + null => "null", + [] => "empty", + _ => "has items" + }; +#else + // .NET Framework 4.8 compatible code + string result; + if (items == null) + result = "null"; + else if (items.Length == 0) + result = "empty"; + else + result = "has items"; +#endif +``` + +--- + +## Testing Library Compatibility + +### Unit Testing Frameworks + +| Framework | .NET 4.8 Support | Notes | +|-----------|------------------|-------| +| **NUnit** | ✅ Yes (v3.x, v4.x) | Already used in project | +| **xUnit** | ✅ Yes (v2.x) | Alternative option | +| **MSTest** | ✅ Yes (v2.x) | Visual Studio integrated | + +### Mocking Libraries + +| Library | .NET 4.8 Support | Notes | +|---------|------------------|-------| +| **Moq** | ✅ Yes (v4.x) | Most popular | +| **NSubstitute** | ✅ Yes | Simpler syntax | +| **FakeItEasy** | ✅ Yes | Another alternative | + +### UI Automation + +| Library | .NET 4.8 Support | Notes | +|---------|------------------|-------| +| **FlaUI** | ✅ Yes | Modern, actively maintained | +| **TestStack.White** | ✅ Yes | Older, less maintained | + +### Assertion Libraries + +| Library | .NET 4.8 Support | Notes | +|---------|------------------|-------| +| **FluentAssertions** | ✅ Yes (v6.x) | Recommended | +| **Shouldly** | ✅ Yes | Alternative | + +--- + +## Action Items + +### Required Fix + +1. **Update TESTABILITY_ROADMAP.md** - Fix P1.3 switch expression to use traditional switch statement + +### Recommended Actions + +1. **Set LangVersion**: Explicitly set `7.3` in .csproj for .NET 4.8 builds +2. **Review Code**: Before implementing, verify no C# 8.0+ features creep into .NET 4.8 code paths +3. **CI/CD Testing**: Ensure CI builds and tests both .NET 4.8 and .NET 8+ versions +4. **Documentation**: Add compatibility notes to code comments when using C# 7.0+ features + +### Optional Enhancements + +1. **Use `#if` conditionals** for framework-specific optimizations +2. **Consider polyfills** for missing APIs (e.g., `System.HashCode` for .NET 4.8) +3. **Test both frameworks** in CI/CD pipeline + +--- + +## Conclusion + +The proposed testability improvements are **99% compatible** with .NET 4.8. Only one fix is required: + +✅ **Action Required**: Update switch expression in P1.3 to traditional switch statement + +All other proposed features (AsyncLocal, Task/async-await, lambda expressions, expression-bodied members, null-conditional operators) are fully supported in .NET 4.8. + +The project can safely implement all phases of the testability roadmap with this single correction. diff --git a/TESTABILITY_ROADMAP.md b/TESTABILITY_ROADMAP.md new file mode 100644 index 0000000..c4c792c --- /dev/null +++ b/TESTABILITY_ROADMAP.md @@ -0,0 +1,839 @@ +# Testability Improvements Roadmap + +## Overview + +The InformationBox codebase dates from 2007 with tightly-coupled Windows Forms architecture. Current testability score: **1.7/10**. Only existing tests cover code generation in the Designer tool. + +This document outlines a phased approach to improve testability while maintaining backward compatibility. + +--- + +## Current Testability Challenges + +1. **Windows Forms Coupling**: `InformationBoxForm` inherits from `Form`, requires UI thread, window handles, and graphics resources +2. **Static State**: `InformationBoxScope.Current` uses static `Stack` (not thread-safe) +3. **Hardcoded Dependencies**: Direct usage of `SystemFonts`, `SystemSounds`, `CreateGraphics()`, `Screen.PrimaryScreen` +4. **Complex Initialization**: 33-parameter constructor with runtime type detection on `params object[]` +5. **Layout Calculation**: 110-line `SetLayout()` method with graphics-dependent calculations (lines 999-1110) +6. **Event-Driven Logic**: Button clicks, timer events (115-line auto-close method, lines 1677-1791) hard to test +7. **No Abstraction Layers**: Direct instantiation of all dependencies + +--- + +## Priority 0 (High Impact, Medium Effort) - Foundation + +### P0.1: Extract Presenter Logic from InformationBoxForm + +**Goal**: Separate business logic from UI to enable pure unit testing. + +**Status**: ⏳ Not Started + +**Changes**: +- Create `InformationBoxModel.cs` - pure data class with all configuration +- Create `InformationBoxPresenter.cs` - testable business logic class +- Extract methods from `InformationBoxForm.cs`: + - `CalculateLayout()` - extract lines 999-1110 from `SetLayout()` + - `GetButtons()` - extract lines 1323-1408 from `SetButtons()` + - `UpdateAutoClose()` - extract lines 1677-1791 from `TmrAutoClose_Tick()` + - `FormatText()` - extract text measurement and regex splitting logic + +**Files to create**: +``` +InfoBox/Presentation/InformationBoxModel.cs +InfoBox/Presentation/InformationBoxPresenter.cs +InfoBox/Presentation/LayoutCalculation.cs +InfoBox/Presentation/ButtonDefinition.cs +InfoBox/Presentation/AutoCloseState.cs +``` + +**Code Example**: +```csharp +// Model: Pure data class +public class InformationBoxModel +{ + public string Text { get; set; } + public string Title { get; set; } + public InformationBoxButtons Buttons { get; set; } + public InformationBoxIcon Icon { get; set; } + public AutoCloseParameters AutoClose { get; set; } + // ... all configuration + + // Testable validation + public ValidationResult Validate() { ... } +} + +// Presenter: Testable business logic +public class InformationBoxPresenter +{ + private readonly InformationBoxModel _model; + private readonly ITextMeasurement _textMeasurement; + + public InformationBoxPresenter(InformationBoxModel model, ITextMeasurement textMeasurement) + { + _model = model; + _textMeasurement = textMeasurement; + } + + // Extract complex layout logic - now fully testable! + public LayoutCalculation CalculateLayout(int maxWidth, int maxHeight) + { + // Lines 999-1110 from SetLayout() extracted here + // No WinForms dependencies, pure calculation + var result = new LayoutCalculation(); + + var textSize = _textMeasurement.MeasureString(_model.Text, _model.Font, maxWidth); + result.TextHeight = (int)textSize.Height; + result.RequiredWidth = (int)textSize.Width + 50; // margins + + // ... all layout calculations without touching controls + return result; + } + + // Extract button generation logic - testable! + public List GetButtons() + { + // Lines 1323-1408 logic extracted + var buttons = new List(); + + if (_model.Buttons.HasFlag(InformationBoxButtons.OK)) + buttons.Add(new ButtonDefinition("OK", InformationBoxResult.OK, isDefault: true)); + + // ... button logic + return buttons; + } + + // Extract auto-close logic - testable! + public AutoCloseState UpdateAutoClose(TimeSpan elapsed) + { + // Lines 1677-1791 timer logic extracted - no Timer dependency! + // Pure function: given elapsed time, return new state + return new AutoCloseState { + RemainingSeconds = ..., + DefaultButton = ..., + ShouldClose = ... + }; + } +} + +// View: Thin WinForms wrapper +public partial class InformationBoxForm : Form +{ + private readonly InformationBoxPresenter _presenter; + + public void ApplyLayout(LayoutCalculation layout) + { + // Apply calculated values to controls + this.Width = layout.RequiredWidth; + this.Height = layout.RequiredHeight; + this.messageText.Size = new Size(layout.TextWidth, layout.TextHeight); + } +} +``` + +**Benefits**: +- Pure unit tests for layout, button, and auto-close logic +- No WinForms dependencies in business logic +- Testable without UI thread or graphics resources + +--- + +### P0.2: Introduce ITextMeasurement Interface + +**Goal**: Abstract graphics-dependent text measurement to enable headless testing. + +**Status**: ⏳ Not Started + +**Changes**: +```csharp +// New interface +public interface ITextMeasurement +{ + SizeF MeasureString(string text, Font font, int width); + int GetLineHeight(Font font); +} + +// Production implementation +public class GraphicsTextMeasurement : ITextMeasurement +{ + private readonly Graphics _graphics; + + public GraphicsTextMeasurement(Graphics graphics) + { + _graphics = graphics; + } + + public SizeF MeasureString(string text, Font font, int width) + { + return _graphics.MeasureString(text, font, width); + } + + public int GetLineHeight(Font font) + { + return (int)Math.Ceiling(_graphics.MeasureString("X", font).Height); + } +} + +// Test implementation +public class MockTextMeasurement : ITextMeasurement +{ + private readonly Dictionary _measurements = new(); + + public void SetMeasuredSize(string text, SizeF size) + { + _measurements[text] = size; + } + + public SizeF MeasureString(string text, Font font, int width) + { + return _measurements.TryGetValue(text, out var size) ? size : new SizeF(100, 20); + } + + public int GetLineHeight(Font font) + { + return 20; // Fixed height for testing + } +} +``` + +**Files to create**: +``` +InfoBox/Abstractions/ITextMeasurement.cs +InfoBox/Implementation/GraphicsTextMeasurement.cs +InfoBox.Tests/Mocks/MockTextMeasurement.cs (new test project) +``` + +**Files to modify**: +- `InfoBox/Form/InformationBoxForm.cs` - inject `ITextMeasurement` instead of using `measureGraphics` directly (line 291) +- `InformationBoxPresenter.cs` - accept `ITextMeasurement` in constructor + +**Benefits**: +- Tests can run without graphics context +- Predictable, deterministic text sizing in tests +- Enables CI/CD on headless servers + +--- + +## Priority 1 (High Impact, Low Effort) - Quick Wins + +### P1.1: Replace Static Scope with AsyncLocal + +**Goal**: Make `InformationBoxScope` thread-safe for concurrent test execution. + +**Status**: ⏳ Not Started + +**Changes**: +```csharp +// In InfoBox/Context/InformationBoxScope.cs +private static readonly AsyncLocal> _scopeStack + = new AsyncLocal>(); + +private static Stack ScopeStack +{ + get + { + if (_scopeStack.Value == null) + _scopeStack.Value = new Stack(); + return _scopeStack.Value; + } +} + +// Add test hook +internal static Func TestScopeProvider { get; set; } + +public static IInformationBoxScope Current +{ + get + { + if (TestScopeProvider != null) + return TestScopeProvider(); + return ScopeStack.Count > 0 ? ScopeStack.Peek() : null; + } +} +``` + +**Files to modify**: +- `InfoBox/Context/InformationBoxScope.cs` + +**Files to create**: +- `InfoBox/Abstractions/IInformationBoxScope.cs` + +**Benefits**: +- Tests can run in parallel without interference +- Scopes isolated per async context +- Testable via `TestScopeProvider` injection + +--- + +### P1.2: Add Factory Pattern for Form Creation + +**Goal**: Enable mocking of form instantiation in tests. + +**Status**: ⏳ Not Started + +**Changes**: +```csharp +// New interface +public interface IInformationBoxFactory +{ + IInformationBoxDisplay Create(string text, params object[] parameters); +} + +// New interface for form +public interface IInformationBoxDisplay +{ + InformationBoxResult ShowModal(); + void ShowModeless(); + InformationBoxResult Result { get; } + event EventHandler Closed; +} + +// Production factory +public class InformationBoxFactory : IInformationBoxFactory +{ + public IInformationBoxDisplay Create(string text, params object[] parameters) + { + return new InformationBoxForm(text, parameters); + } +} + +// Refactor static API (backward compatible) +public static class InformationBox +{ + // Internal for testing - allows injection of mock factory + internal static IInformationBoxFactory Factory { get; set; } + = new InformationBoxFactory(); + + public static InformationBoxResult Show(string text, params object[] parameters) + { + var display = Factory.Create(text, parameters); + return display.ShowModal(); + } +} +``` + +**Files to create**: +``` +InfoBox/Abstractions/IInformationBoxFactory.cs +InfoBox/Abstractions/IInformationBoxDisplay.cs +InfoBox/Implementation/InformationBoxFactory.cs +``` + +**Files to modify**: +- `InfoBox/InformationBox.cs` - add Factory property and use it (lines 150-424) +- `InfoBox/Form/InformationBoxForm.cs` - implement `IInformationBoxDisplay` + +**Benefits**: +- Code that calls `InformationBox.Show()` can be tested with mock factory +- No breaking changes to public API +- Simple dependency injection point + +--- + +### P1.3: Add ISystemResources Interface + +**Goal**: Abstract system dependencies (fonts, sounds, screen metrics). + +**Status**: ⏳ Not Started + +**Changes**: +```csharp +public interface ISystemResources +{ + Font GetMessageBoxFont(); + void PlaySound(InformationBoxSound sound); + Rectangle GetWorkingArea(); + Rectangle GetWorkingArea(Form form); // For multi-monitor support +} + +public class WindowsSystemResources : ISystemResources +{ + public Font GetMessageBoxFont() => SystemFonts.MessageBoxFont; + + public void PlaySound(InformationBoxSound sound) + { + // Lines 654-662 logic from InformationBoxForm.PlaySound() + // Note: Using traditional switch statement for .NET 4.8 compatibility + SystemSound systemSound; + switch (sound) + { + case InformationBoxSound.Beep: + systemSound = SystemSounds.Beep; + break; + case InformationBoxSound.Asterisk: + systemSound = SystemSounds.Asterisk; + break; + case InformationBoxSound.Exclamation: + systemSound = SystemSounds.Exclamation; + break; + case InformationBoxSound.Hand: + systemSound = SystemSounds.Hand; + break; + case InformationBoxSound.Question: + systemSound = SystemSounds.Question; + break; + default: + systemSound = null; + break; + } + + if (systemSound != null) + { + systemSound.Play(); + } + } + + public Rectangle GetWorkingArea() => Screen.PrimaryScreen.WorkingArea; + + public Rectangle GetWorkingArea(Form form) => Screen.FromControl(form).WorkingArea; +} + +// Test mock +public class MockSystemResources : ISystemResources +{ + public Font MessageBoxFont { get; set; } = new Font("Arial", 10); + public Rectangle WorkingArea { get; set; } = new Rectangle(0, 0, 1920, 1080); + public List PlayedSounds { get; } = new List(); + + public Font GetMessageBoxFont() => MessageBoxFont; + + public void PlaySound(InformationBoxSound sound) => PlayedSounds.Add(sound); + + public Rectangle GetWorkingArea() => WorkingArea; + + public Rectangle GetWorkingArea(Form form) => WorkingArea; +} +``` + +**Files to create**: +``` +InfoBox/Abstractions/ISystemResources.cs +InfoBox/Implementation/WindowsSystemResources.cs +InfoBox.Tests/Mocks/MockSystemResources.cs +``` + +**Files to modify**: +- `InfoBox/Form/InformationBoxForm.cs` - inject `ISystemResources`: + - Line 295-296: Replace `SystemFonts.MessageBoxFont` with `_systemResources.GetMessageBoxFont()` + - Lines 654-662: Replace `PlaySound()` method with `_systemResources.PlaySound()` + - Line 1023: Replace `Screen.PrimaryScreen.WorkingArea` with `_systemResources.GetWorkingArea()` + +**Benefits**: +- Tests don't require system fonts installed +- No audio playback during tests +- Mock screen dimensions for layout tests + +--- + +## Priority 2 (Medium Impact, Medium Effort) - Enhanced Testing + +### P2.1: Add Async/Await API for Modeless Dialogs + +**Goal**: Modern async pattern for testable modeless behavior. + +**Status**: ⏳ Not Started + +**Changes**: +```csharp +public static class InformationBox +{ + public static Task ShowAsync(string text, params object[] parameters) + { + var tcs = new TaskCompletionSource(); + + // Ensure we're on UI thread for WinForms + if (Application.OpenForms.Count > 0) + { + Application.OpenForms[0].Invoke(new Action(() => + { + var display = Factory.Create(text, parameters); + display.Closed += (s, e) => tcs.SetResult(display.Result); + display.ShowModeless(); + })); + } + else + { + var display = Factory.Create(text, parameters); + display.Closed += (s, e) => tcs.SetResult(display.Result); + display.ShowModeless(); + } + + return tcs.Task; + } +} +``` + +**Files to modify**: +- `InfoBox/InformationBox.cs` - add `ShowAsync()` method +- `InfoBox/Form/InformationBoxForm.cs` - ensure `Closed` event fires correctly + +**Benefits**: +- Tests can await modeless dialogs +- Modern async/await pattern +- No callback complexity in tests + +--- + +### P2.2: Set Up FlaUI Integration Tests + +**Goal**: End-to-end UI automation testing for real form behavior. + +**Status**: ⏳ Not Started + +**Steps**: +1. Create new test project: `InfoBox.IntegrationTests` +2. Add NuGet packages: `FlaUI.Core`, `FlaUI.UIA3`, `NUnit` +3. Create test helper: `InfoBoxTestHelper.cs` for launching forms on STA thread +4. Write integration tests: + - Button click tests + - Keyboard navigation (Enter, Escape, Tab) + - Auto-close timer behavior + - Layout verification with different text lengths + - Icon display verification + +**Files to create**: +``` +InfoBox.IntegrationTests/InfoBox.IntegrationTests.csproj +InfoBox.IntegrationTests/Helpers/InfoBoxTestHelper.cs +InfoBox.IntegrationTests/BasicTests.cs +InfoBox.IntegrationTests/ButtonTests.cs +InfoBox.IntegrationTests/AutoCloseTests.cs +InfoBox.IntegrationTests/LayoutTests.cs +``` + +**Example test**: +```csharp +[Test] +[Apartment(ApartmentState.STA)] +public void InformationBox_ClickOK_ReturnsOKResult() +{ + InformationBoxResult result = InformationBoxResult.None; + + var formTask = Task.Run(() => + { + result = InformationBox.Show( + "Test message", + InformationBoxButtons.OKCancel); + }); + + Thread.Sleep(500); // Wait for form to appear + + using (var automation = new UIA3Automation()) + { + var window = automation.GetDesktop() + .FindFirstDescendant(cf => cf.ByControlType(ControlType.Window)) + ?.AsWindow(); + + var okButton = window.FindFirstDescendant(cf => cf.ByText("OK"))?.AsButton(); + okButton.Click(); + } + + formTask.Wait(); + Assert.AreEqual(InformationBoxResult.OK, result); +} +``` + +**Benefits**: +- Tests real UI behavior (not just logic) +- Catches rendering/layout bugs +- Validates keyboard/mouse interaction +- Can run in CI/CD with display server + +--- + +### P2.3: Create Unit Test Project Structure + +**Goal**: Establish comprehensive unit test coverage for presenter logic. + +**Status**: ⏳ Not Started + +**Structure**: +``` +InfoBox.Tests/ + ├── InfoBox.Tests.csproj + ├── Mocks/ + │ ├── MockTextMeasurement.cs + │ ├── MockSystemResources.cs + │ └── MockInformationBoxScope.cs + ├── Presentation/ + │ ├── InformationBoxPresenterTests.cs + │ ├── LayoutCalculationTests.cs + │ ├── ButtonGenerationTests.cs + │ └── AutoCloseLogicTests.cs + ├── Scope/ + │ └── InformationBoxScopeTests.cs + └── ParameterParsing/ + └── ParameterDetectionTests.cs +``` + +**Test coverage targets**: +- Layout calculations with various text lengths (short, medium, long, multi-line) +- Button generation for all `InformationBoxButtons` enum combinations +- Auto-close countdown logic (tick-by-tick verification) +- Parameter parsing for all supported types +- Scope inheritance and parameter merging + +**Example test**: +```csharp +[Test] +public void Presenter_CalculateLayout_LongText_ProducesExpectedDimensions() +{ + var model = new InformationBoxModel + { + Text = "Very long text that spans multiple lines and requires careful layout calculation", + Buttons = InformationBoxButtons.OKCancel, + Icon = InformationBoxIcon.Information + }; + + var mockTextMeasurement = new MockTextMeasurement(); + mockTextMeasurement.SetMeasuredSize(model.Text, new SizeF(400, 80)); + + var presenter = new InformationBoxPresenter(model, mockTextMeasurement); + var layout = presenter.CalculateLayout(maxWidth: 500, maxHeight: 600); + + Assert.AreEqual(450, layout.RequiredWidth); + Assert.AreEqual(220, layout.RequiredHeight); + Assert.AreEqual(400, layout.TextWidth); + Assert.AreEqual(80, layout.TextHeight); +} +``` + +--- + +## Priority 3 (Complete Architecture, High Effort) - Long-term + +### P3.1: Full Model-View-Presenter (MVP) Refactoring + +**Goal**: Complete separation of concerns with thin view layer. + +**Status**: ⏳ Not Started + +**Architecture**: +``` +Model (pure data) + ↓ +Presenter (business logic, testable) + ↓ +View Interface (IInformationBoxView) + ↓ +InformationBoxForm (thin WinForms wrapper) +``` + +**View interface**: +```csharp +public interface IInformationBoxView +{ + // Data binding + string Text { get; set; } + string Title { get; set; } + Font Font { get; set; } + + // Layout + void SetSize(int width, int height); + void SetTextAreaSize(int width, int height); + void SetPosition(Point location); + + // Components + void AddButton(ButtonDefinition button); + void SetIcon(Icon icon); + void ShowCheckBox(string text, bool isChecked); + + // Behavior + void Close(InformationBoxResult result); + void StartAutoCloseTimer(int milliseconds); + void UpdateButtonText(string buttonName, string newText); + + // Events + event EventHandler ButtonClicked; + event EventHandler KeyPressed; + event EventHandler Load; +} +``` + +**Benefits**: +- 100% testable business logic +- View is pure data binding (no logic) +- Can create mock view for fast tests +- Can swap view implementation (e.g., WPF, Avalonia) + +**Effort**: High - requires restructuring 1,796 lines of `InformationBoxForm.cs` + +--- + +### P3.2: Parameter Builder Pattern + +**Goal**: Replace `params object[]` with type-safe fluent API (optional, backward compatible). + +**Status**: ⏳ Not Started + +**Design**: +```csharp +public class InformationBoxParameters +{ + public static InformationBoxParameters Create(string text) + => new InformationBoxParameters { Text = text }; + + public string Text { get; private set; } + public string Title { get; private set; } + public InformationBoxButtons Buttons { get; private set; } = InformationBoxButtons.OK; + + public InformationBoxParameters WithTitle(string title) + { + Title = title; + return this; + } + + public InformationBoxParameters WithButtons(InformationBoxButtons buttons) + { + Buttons = buttons; + return this; + } + + public InformationBoxParameters WithIcon(InformationBoxIcon icon) + { + Icon = icon; + return this; + } + + public InformationBoxParameters WithAutoClose(int milliseconds) + { + AutoClose = new AutoCloseParameters(milliseconds); + return this; + } + + // ... all parameters with fluent API +} + +// Usage (backward compatible - keep existing API) +var result = InformationBox.Show( + InformationBoxParameters.Create("Save changes?") + .WithTitle("Confirmation") + .WithButtons(InformationBoxButtons.YesNoCancel) + .WithIcon(InformationBoxIcon.Question) + .WithAutoClose(5000) +); +``` + +**Benefits**: +- Type-safe parameter construction +- IntelliSense discoverable +- Testable parameter validation +- Keeps existing `params object[]` API for backward compatibility + +--- + +## Implementation Phases + +### Phase 1 (Weeks 1-2): P0 - Foundation +- [ ] P0.1: Extract presenter logic +- [ ] P0.2: Add `ITextMeasurement` interface +- [ ] Create first unit test project + +**Expected Outcome**: Testability 4/10 +- Layout, button, auto-close logic unit tested +- Headless testing possible + +--- + +### Phase 2 (Weeks 3-4): P1 - Quick Wins +- [ ] P1.1: Thread-safe scope with `AsyncLocal` +- [ ] P1.2: Factory pattern +- [ ] P1.3: `ISystemResources` interface + +**Expected Outcome**: Testability 6/10 +- Thread-safe, mockable dependencies +- Code calling `InformationBox.Show()` testable + +--- + +### Phase 3 (Weeks 5-8): P2 - Enhanced Testing +- [ ] P2.1: Async/await API +- [ ] P2.2: FlaUI integration tests +- [ ] P2.3: Comprehensive unit test coverage + +**Expected Outcome**: Testability 8/10 +- Integration tests cover real UI behavior +- Async API tested +- 60%+ code coverage + +--- + +### Phase 4 (Months 3-6): P3 - Architecture (Optional) +- [ ] P3.1: Full MVP refactoring +- [ ] P3.2: Builder pattern API + +**Expected Outcome**: Testability 9/10 +- Full MVP separation +- 80%+ code coverage +- Type-safe builder API + +--- + +## Testing Tools Recommendations + +### Unit Testing +- **NUnit** (already used in Designer tests) +- **Moq** for mocking +- **FluentAssertions** for readable assertions + +### Integration Testing +- **FlaUI** (modern UI automation for Windows) +- Alternative: TestStack.White (older, less maintained) + +### CI/CD +- GitHub Actions with Windows runners (for UI tests) +- xUnit for parallel test execution (optional migration from NUnit) + +### Code Coverage +- **Coverlet** for .NET Core coverage +- **ReportGenerator** for HTML reports +- Target: 80%+ coverage for presenter logic + +--- + +## Backward Compatibility Notes + +All improvements should maintain backward compatibility: +- ✅ Keep existing `InformationBox.Show()` signatures +- ✅ Internal refactoring only +- ✅ New interfaces have default implementations +- ✅ Factory pattern uses default factory if not set +- ✅ No breaking changes to public API + +### .NET 4.8 Compatibility + +All proposed code changes are compatible with .NET Framework 4.8: +- ✅ **AsyncLocal**: Available since .NET 4.6 +- ✅ **Task/async-await**: Available since .NET 4.5 +- ✅ **Expression-bodied members**: C# 6.0 feature, works with .NET 4.8 +- ✅ **Null-conditional operators** (`?.`): C# 6.0 feature, works with .NET 4.8 +- ✅ **Lambda expressions**: Available since .NET 3.5 +- ⚠️ **Avoid C# 8.0+ features**: No switch expressions, use traditional switch statements +- 📝 **See NET48_COMPATIBILITY_REVIEW.md** for detailed compatibility analysis + +**Recommended project settings for dual-targeting**: +```xml +net48;net8.0-windows +7.3 +``` + +--- + +## Success Metrics + +| Phase | Testability Score | Key Achievements | +|-------|-------------------|------------------| +| **Current** | 1.7/10 | Only Designer code generation tested | +| **After P0** | 4/10 | Layout, button, auto-close logic unit tested; headless testing possible | +| **After P1** | 6/10 | Thread-safe, mockable dependencies; code calling `InformationBox.Show()` testable | +| **After P2** | 8/10 | Integration tests cover real UI behavior; 60%+ code coverage | +| **After P3** | 9/10 | Full MVP separation; 80%+ code coverage; type-safe builder API | + +--- + +## Notes + +- This roadmap was created on 2026-01-21 based on codebase analysis +- All changes should be implemented incrementally +- Each phase should include updating documentation +- Consider creating feature branches for each priority level +- Run existing Designer tests after each change to ensure no regressions