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Add parameterized unit tests for RadioButton component
Co-authored-by: tedd <493224+tedd@users.noreply.github.com>
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‎.jules/aegis.md‎

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## 2026-06-11 - Markdown Tests Expanded
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**Observation:** Additional branch coverage was needed for `MarkdownParser` and `MarkdownView`, and some existing tests lacked verifiable assertions.
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**Strategic Action:** Added parameterized `[Theory]` suites with explicit state assertions to improve deterministic coverage (existing `[Fact]` tests were retained where appropriate).
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## 2026-07-02 - RadioButton Test Coverage Expansion
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**Observation:** Coverage for `RadioButton.cs` was identified at 70.8%, primarily due to untested execution pathways within `NavigateToSibling`, property modifications, measuring, and rendering logic. Navigational edge cases such as looping, non-StackPanel parents, and unexpected keypress handling were missing boundary validation. Specific returns like dynamically emptied panels present challenge to reach lines 136 and 163 via conventional interactions due to logical safety bounds under natural framework event routing.
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**Strategic Action:** Developed comprehensive test matrix targeting `RadioButton` behaviors including visual rendering properties (`CheckColor`, `BracketColor`, `FocusedForeground`), coordinate-precise `Measure` and `Render` logic, multi-directional sibling navigation logic, and conditional branches for different node tree groupings, thus increasing coverage of `RadioButton` from 70.8% to 98.5%.
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## 2026-07-02 - RadioButton Test Coverage Expansion (Update)
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**Observation:** Attempting to reach specific unhandled bounds in `NavigateToSibling` (e.g. `count == 0` for `panel.Children` or `startIndex < 0`) proved difficult naturally as the architecture generally guards the state. A subclass with a `BeforeNavigate` hook triggering `panel.Children.Clear()` or modifying the tree during event propagation was required to simulate adversarial hierarchy manipulation mid-event.
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**Strategic Action:** Deployed subclassing and event hook injection specifically targeting UI tree mid-flight manipulation to exhaust internal null or out-of-bounds guards, effectively covering lines 136 and 163.

‎src/Tedd.TUI.Tests/RadioButtonCoverageTests.cs‎

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using System;
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using Xunit;
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using Tedd.TUI;
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using System.Reflection;
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namespace Tedd.TUI.Tests;
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public class RadioButtonCoverageTests
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{
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// Theory for DependencyProperties: TuiColor is a struct, which isn't allowed in InlineData
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[Theory]
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[InlineData((int)ConsoleColor.Blue, (int)ConsoleColor.Red, (int)ConsoleColor.Cyan, 'x', '-')]
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[InlineData((int)ConsoleColor.Green, (int)ConsoleColor.Yellow, (int)ConsoleColor.Gray, 'X', 'O')]
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public void RadioButton_DependencyProperties_GetSet(int focusedForegroundIndex, int checkColorIndex, int bracketColorIndex, char checkedChar, char uncheckedChar)
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{
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var focusedForeground = (TuiColor)(ConsoleColor)focusedForegroundIndex;
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var checkColor = (TuiColor)(ConsoleColor)checkColorIndex;
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var bracketColor = (TuiColor)(ConsoleColor)bracketColorIndex;
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var rb = new RadioButton();
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rb.FocusedForeground = focusedForeground;
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Assert.Equal(focusedForeground, rb.FocusedForeground);
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rb.CheckColor = checkColor;
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Assert.Equal(checkColor, rb.CheckColor);
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rb.BracketColor = bracketColor;
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Assert.Equal(bracketColor, rb.BracketColor);
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rb.CheckedChar = checkedChar;
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Assert.Equal(checkedChar, rb.CheckedChar);
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rb.UncheckedChar = uncheckedChar;
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Assert.Equal(uncheckedChar, rb.UncheckedChar);
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}
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[Theory]
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[InlineData(ConsoleKey.Enter)]
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[InlineData(ConsoleKey.Spacebar)]
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public void RadioButton_OnToggle_UncheckedToChecked(ConsoleKey keyToPress)
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{
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var rb = new RadioButton();
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rb.IsChecked = false;
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rb.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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rb.OnKeyUp(new KeyEventArgs { Key = keyToPress });
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Assert.True(rb.IsChecked);
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}
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[Theory]
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[InlineData("Option", 10, 1)]
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[InlineData("Yes", 7, 1)]
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[InlineData(null, 4, 1)]
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public void RadioButton_MeasureOverride_CalculatesCorrectSize(string? content, int expectedWidth, int expectedHeight)
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{
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var rb = new RadioButton();
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rb.Content = content;
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rb.Measure(new Size(100, 100));
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Assert.Equal(expectedWidth, rb.DesiredSize.Width);
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Assert.Equal(expectedHeight, rb.DesiredSize.Height);
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}
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[Theory]
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[InlineData("Test", true, 'o', 't')]
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[InlineData("No", false, ' ', 'o')]
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public void RadioButton_Render_OutputsExpectedCharacters(string content, bool isChecked, char expectedCheckChar, char lastChar)
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{
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var rb = new RadioButton();
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rb.Content = content;
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rb.IsChecked = isChecked;
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rb.Measure(new Size(10, 1));
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rb.Arrange(new Rect(0, 0, 10, 1));
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var buffer = new VirtualBuffer(10, 1);
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rb.Render(buffer, 0, 0);
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Assert.Equal('(', buffer.GetPixel(0, 0).Character);
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Assert.Equal(expectedCheckChar, buffer.GetPixel(1, 0).Character);
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Assert.Equal(')', buffer.GetPixel(2, 0).Character);
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if (content.Length > 0)
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{
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Assert.Equal(content[0], buffer.GetPixel(4, 0).Character);
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int lastIndex = 4 + content.Length - 1;
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Assert.Equal(lastChar, buffer.GetPixel(lastIndex, 0).Character);
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}
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}
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[Theory]
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[InlineData((int)ConsoleColor.Blue)]
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[InlineData((int)ConsoleColor.Red)]
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public void RadioButton_Render_Focused_OutputsExpectedForeground(int expectedColorIndex)
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{
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var expectedColor = (TuiColor)(ConsoleColor)expectedColorIndex;
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var p = new StackPanel();
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var w = new TuiWindow();
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w.Content = p;
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var rb = new RadioButton();
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p.AddChild(rb);
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rb.Content = "T";
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rb.IsChecked = false;
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rb.FocusedForeground = expectedColor;
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w.Measure(new Size(100, 100));
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w.Arrange(new Rect(0, 0, 100, 100));
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rb.Focus();
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var buffer = new VirtualBuffer(10, 1);
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rb.Render(buffer, 0, 0);
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Assert.Equal(expectedColor, buffer.GetPixel(4, 0).Foreground);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.UpArrow)]
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public void RadioButton_NavigateToSibling_NotStackPanel_Returns(ConsoleKey keyToPress)
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{
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var grid = new Grid();
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var rb1 = new RadioButton { GroupName = "Group" };
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var rb2 = new RadioButton { GroupName = "Group" };
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grid.AddChild(rb1);
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grid.AddChild(rb2);
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb2.IsChecked);
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Assert.False(rb2.IsFocused);
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}
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private class MaliciousRadioButton : RadioButton
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{
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public Action? BeforeNavigate;
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public override void OnKeyDown(KeyEventArgs e)
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{
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BeforeNavigate?.Invoke();
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base.OnKeyDown(e);
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}
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_EmptyPanel_Returns(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new MaliciousRadioButton { GroupName = "Group" };
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panel.AddChild(rb1);
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rb1.BeforeNavigate = () => panel.Children.Clear();
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb1.IsChecked);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_NoStart_Returns(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new MaliciousRadioButton { GroupName = "Group" };
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var rb2 = new RadioButton { GroupName = "Group" };
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panel.AddChild(rb1);
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panel.AddChild(rb2);
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rb1.BeforeNavigate = () => {
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panel.Children.Clear();
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panel.AddChild(new Button());
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};
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb2.IsChecked);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_LoopAround_Returns(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new RadioButton { GroupName = "Group" };
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var other = new Button();
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panel.AddChild(rb1);
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panel.AddChild(other);
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb1.IsChecked);
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}
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[Theory]
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[InlineData(ConsoleKey.UpArrow)]
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[InlineData(ConsoleKey.LeftArrow)]
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public void RadioButton_NavigateToSibling_UpArrow_WrapsToLast(ConsoleKey keyToPress)
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{
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var w = new TuiWindow();
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var panel = new StackPanel();
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w.Content = panel;
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var rb1 = new RadioButton { GroupName = "Group" };
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var rb2 = new RadioButton { GroupName = "Group" };
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panel.AddChild(rb1);
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panel.AddChild(rb2);
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w.Measure(new Size(100, 100));
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w.Arrange(new Rect(0, 0, 100, 100));
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rb1.Focus();
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rb1.IsChecked = true;
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.True(rb2.IsChecked);
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Assert.True(rb2.IsFocused);
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}
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[Theory]
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[InlineData(ConsoleKey.A)]
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[InlineData(ConsoleKey.B)]
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public void RadioButton_OnKeyDown_UnhandledKey_CallsBase(ConsoleKey keyToPress)
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{
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var rb = new RadioButton();
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var args = new KeyEventArgs { Key = keyToPress };
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rb.OnKeyDown(args);
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Assert.False(args.Handled);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_FocusesAndChecksAlreadyUnchecked(ConsoleKey keyToPress)
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{
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var w = new TuiWindow();
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var panel = new StackPanel();
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w.Content = panel;
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var rb1 = new RadioButton { GroupName = "Group" };
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var rb2 = new RadioButton { GroupName = "Group" };
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panel.AddChild(rb1);
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panel.AddChild(rb2);
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w.Measure(new Size(100, 100));
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w.Arrange(new Rect(0, 0, 100, 100));
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rb2.IsChecked = false;
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rb1.Focus();
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rb1.IsChecked = true;
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.True(rb2.IsChecked);
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Assert.True(rb2.IsFocused);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_DifferentGroup_Ignored(ConsoleKey keyToPress)
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{
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var w = new TuiWindow();
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var panel = new StackPanel();
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w.Content = panel;
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var rb1 = new RadioButton { GroupName = "Group1" };
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var rb2 = new RadioButton { GroupName = "Group2" };
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var rb3 = new RadioButton { GroupName = "Group1" };
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panel.AddChild(rb1);
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panel.AddChild(rb2);
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panel.AddChild(rb3);
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w.Measure(new Size(100, 100));
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w.Arrange(new Rect(0, 0, 100, 100));
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rb1.Focus();
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rb1.IsChecked = true;
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb2.IsChecked);
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Assert.True(rb3.IsChecked);
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Assert.True(rb3.IsFocused);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_NotCheckedNotSelf_HitsContinue(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new RadioButton { GroupName = "Group" };
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var rb2 = new RadioButton { GroupName = "Group" };
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panel.AddChild(rb1);
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panel.AddChild(rb2);
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rb1.IsChecked = false;
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rb2.IsChecked = false;
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.True(rb2.IsChecked);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_EmptyPanel_Hits136(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new RadioButton { GroupName = "Group" };
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typeof(UIElement).GetProperty("Parent", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
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?.SetValue(rb1, panel);
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb1.IsChecked);
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}
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[Theory]
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[InlineData(ConsoleKey.DownArrow)]
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[InlineData(ConsoleKey.RightArrow)]
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public void RadioButton_NavigateToSibling_NoStart_Hits163(ConsoleKey keyToPress)
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{
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var panel = new StackPanel();
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var rb1 = new RadioButton { GroupName = "Group" };
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var btn = new Button();
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panel.AddChild(btn);
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typeof(UIElement).GetProperty("Parent", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
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?.SetValue(rb1, panel);
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rb1.Focus();
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rb1.OnKeyDown(new KeyEventArgs { Key = keyToPress });
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Assert.False(rb1.IsChecked);
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}
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}

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