Basics Done
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using Microsoft.Playwright;
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namespace Enciphered.Blazor.UIComponents.Tests;
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[TestFixture]
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public class ThemeToggleTests : PlaywrightTestBase
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{
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/// <summary>
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/// Navigate to home, wait for sidebar JS + darkmode JS to finish initializing.
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/// </summary>
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private async Task GoHomeAsync()
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{
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await Page.GotoAsync(BaseUrl, new PageGotoOptions { WaitUntil = WaitUntilState.NetworkIdle });
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// Wait for sidebar JS to apply state
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await Page.WaitForSelectorAsync("[data-sidebar-wrapper][data-state]", new PageWaitForSelectorOptions
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{
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Timeout = 10_000
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});
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// Wait for the ThemeToggle button to appear
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await Page.WaitForSelectorAsync("[data-theme-toggle]", new PageWaitForSelectorOptions
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{
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Timeout = 10_000
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});
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}
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/// <summary>
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/// Click the toggle and wait for the dark class to be added to <html>.
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/// </summary>
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private async Task ToggleToDarkAsync()
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{
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await Page.Locator("[data-theme-toggle]").ClickAsync();
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await Page.WaitForFunctionAsync(
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"() => document.documentElement.classList.contains('dark')",
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null,
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new PageWaitForFunctionOptions { Timeout = 5_000 });
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}
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/// <summary>
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/// Click the toggle and wait for the dark class to be removed from <html>.
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/// </summary>
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private async Task ToggleToLightAsync()
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{
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await Page.Locator("[data-theme-toggle]").ClickAsync();
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await Page.WaitForFunctionAsync(
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"() => !document.documentElement.classList.contains('dark')",
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null,
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new PageWaitForFunctionOptions { Timeout = 5_000 });
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}
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// ────────────────────────────────────────────
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// Initial render
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// ────────────────────────────────────────────
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[Test]
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public async Task ThemeToggle_Button_Is_Visible()
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{
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await GoHomeAsync();
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var toggle = Page.Locator("[data-theme-toggle]");
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await Expect(toggle).ToBeVisibleAsync();
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}
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[Test]
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public async Task ThemeToggle_Starts_In_Light_Mode_By_Default()
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{
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await GoHomeAsync();
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.False, "Page should start in light mode when no preference is stored");
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}
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[Test]
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public async Task ThemeToggle_Shows_Moon_Icon_In_Light_Mode()
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{
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await GoHomeAsync();
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var moon = Page.Locator("[data-theme-toggle] [data-theme-icon-moon]");
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var moonDisplay = await moon.EvaluateAsync<string>("el => getComputedStyle(el).display");
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Assert.That(moonDisplay, Is.Not.EqualTo("none"), "Moon icon should be visible in light mode");
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var sun = Page.Locator("[data-theme-toggle] [data-theme-icon-sun]");
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var sunDisplay = await sun.EvaluateAsync<string>("el => el.style.display");
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Assert.That(sunDisplay, Is.EqualTo("none"), "Sun icon should be hidden in light mode");
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}
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// ────────────────────────────────────────────
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// Toggle to dark mode
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// ────────────────────────────────────────────
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[Test]
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public async Task Click_Toggle_Adds_Dark_Class_To_Html()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.True, "Clicking toggle should add 'dark' class to <html>");
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}
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[Test]
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public async Task Click_Toggle_Shows_Sun_Icon_In_Dark_Mode()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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var sun = Page.Locator("[data-theme-toggle] [data-theme-icon-sun]");
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var sunDisplay = await sun.EvaluateAsync<string>("el => el.style.display");
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Assert.That(sunDisplay, Is.Not.EqualTo("none"), "Sun icon should be visible in dark mode");
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var moon = Page.Locator("[data-theme-toggle] [data-theme-icon-moon]");
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var moonDisplay = await moon.EvaluateAsync<string>("el => el.style.display");
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Assert.That(moonDisplay, Is.EqualTo("none"), "Moon icon should be hidden in dark mode");
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}
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[Test]
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public async Task Click_Toggle_Stores_Dark_In_LocalStorage()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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var stored = await Page.EvaluateAsync<string>("() => localStorage.getItem('theme')");
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Assert.That(stored, Is.EqualTo("dark"), "localStorage 'theme' should be 'dark' after toggle");
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}
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// ────────────────────────────────────────────
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// Toggle back to light mode
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// ────────────────────────────────────────────
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[Test]
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public async Task Double_Click_Toggle_Returns_To_Light_Mode()
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{
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await GoHomeAsync();
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// Toggle to dark
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await ToggleToDarkAsync();
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// Toggle back to light
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await ToggleToLightAsync();
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.False, "Double-clicking toggle should return to light mode");
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var stored = await Page.EvaluateAsync<string>("() => localStorage.getItem('theme')");
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Assert.That(stored, Is.EqualTo("light"), "localStorage should be 'light' after toggling back");
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}
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[Test]
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public async Task Double_Click_Toggle_Shows_Moon_Icon_Again()
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{
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await GoHomeAsync();
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// Dark
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await ToggleToDarkAsync();
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// Light again
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await ToggleToLightAsync();
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var moon = Page.Locator("[data-theme-toggle] [data-theme-icon-moon]");
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var moonDisplay = await moon.EvaluateAsync<string>("el => getComputedStyle(el).display");
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Assert.That(moonDisplay, Is.Not.EqualTo("none"), "Moon icon should be visible again after toggling back");
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var sun = Page.Locator("[data-theme-toggle] [data-theme-icon-sun]");
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var sunDisplay = await sun.EvaluateAsync<string>("el => el.style.display");
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Assert.That(sunDisplay, Is.EqualTo("none"), "Sun icon should be hidden again after toggling back");
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}
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// ────────────────────────────────────────────
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// Persistence across page reloads
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// ────────────────────────────────────────────
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[Test]
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public async Task Dark_Mode_Persists_After_Reload()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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// Reload the page
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await Page.ReloadAsync(new PageReloadOptions { WaitUntil = WaitUntilState.NetworkIdle });
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// The inline <script> in <head> should apply 'dark' before paint
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.True, "Dark mode should persist after page reload");
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}
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[Test]
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public async Task Dark_Mode_Persists_After_Navigation()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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// Navigate to counter page via sidebar link
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var counterLink = Page.Locator("[data-sidebar] a[href='/counter']");
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await counterLink.ClickAsync();
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await Page.WaitForURLAsync($"{BaseUrl}/counter");
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// Wait for the page to fully settle after enhanced navigation
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await Page.WaitForLoadStateAsync(LoadState.NetworkIdle);
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// Dark class should still be present on <html>
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.True, "Dark mode should persist across navigation");
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// localStorage should also still have 'dark'
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var stored = await Page.EvaluateAsync<string>("() => localStorage.getItem('theme')");
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Assert.That(stored, Is.EqualTo("dark"), "localStorage should still be 'dark' after navigation");
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}
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[Test]
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public async Task Light_Mode_Persists_After_Reload()
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{
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await GoHomeAsync();
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// Toggle to dark then back to light
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await ToggleToDarkAsync();
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await ToggleToLightAsync();
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// Reload
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await Page.ReloadAsync(new PageReloadOptions { WaitUntil = WaitUntilState.NetworkIdle });
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var hasDark = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDark, Is.False, "Light mode should persist after page reload");
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}
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// ────────────────────────────────────────────
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// No FOUC (flash of unstyled content)
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// ────────────────────────────────────────────
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[Test]
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public async Task Dark_Mode_Applied_Before_First_Paint_No_FOUC()
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{
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await GoHomeAsync();
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await ToggleToDarkAsync();
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// Reload and check at DOMContentLoaded — the inline script should have already set .dark
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await Page.ReloadAsync(new PageReloadOptions { WaitUntil = WaitUntilState.DOMContentLoaded });
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var hasDarkImmediately = await Page.EvaluateAsync<bool>(
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"() => document.documentElement.classList.contains('dark')");
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Assert.That(hasDarkImmediately, Is.True,
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"Dark class should be on <html> immediately on DOMContentLoaded (no FOUC)");
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}
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// ────────────────────────────────────────────
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// Visual theming verification
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// ────────────────────────────────────────────
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[Test]
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public async Task Dark_Mode_Changes_Background_Color()
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{
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await Page.SetViewportSizeAsync(1280, 800);
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await GoHomeAsync();
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// Read the --background CSS custom property which drives bg-background
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var lightBgVar = await Page.EvaluateAsync<string>(
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"() => getComputedStyle(document.documentElement).getPropertyValue('--background').trim()");
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// Toggle to dark
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await ToggleToDarkAsync();
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await Page.WaitForTimeoutAsync(200);
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var darkBgVar = await Page.EvaluateAsync<string>(
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"() => getComputedStyle(document.documentElement).getPropertyValue('--background').trim()");
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Assert.That(darkBgVar, Is.Not.EqualTo(lightBgVar),
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$"--background CSS variable should change in dark mode. Light={lightBgVar}, Dark={darkBgVar}");
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}
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[Test]
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public async Task Dark_Mode_Changes_Sidebar_Background()
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{
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await Page.SetViewportSizeAsync(1280, 800);
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await GoHomeAsync();
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var sidebar = Page.Locator("[data-sidebar]");
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var lightSidebarBg = await sidebar.EvaluateAsync<string>(
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"el => getComputedStyle(el).backgroundColor");
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// Toggle to dark
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await ToggleToDarkAsync();
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await Page.WaitForTimeoutAsync(200);
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var darkSidebarBg = await sidebar.EvaluateAsync<string>(
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"el => getComputedStyle(el).backgroundColor");
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Assert.That(darkSidebarBg, Is.Not.EqualTo(lightSidebarBg),
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"Sidebar background should change in dark mode");
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}
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// ────────────────────────────────────────────
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// Button styling (shadcn ghost button)
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// ────────────────────────────────────────────
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[Test]
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public async Task ThemeToggle_Has_Correct_Dimensions()
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{
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await GoHomeAsync();
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var toggle = Page.Locator("[data-theme-toggle]");
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var box = await toggle.BoundingBoxAsync();
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Assert.That(box, Is.Not.Null, "Toggle button should have a bounding box");
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// h-9 w-9 = 36px × 36px
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Assert.That(box!.Width, Is.InRange(34, 38), "Toggle button width should be ~36px (h-9)");
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Assert.That(box.Height, Is.InRange(34, 38), "Toggle button height should be ~36px (w-9)");
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}
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[Test]
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public async Task ThemeToggle_Contains_Exactly_Two_Svg_Icons()
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{
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await GoHomeAsync();
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var toggle = Page.Locator("[data-theme-toggle]");
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var svgCount = await toggle.Locator("svg").CountAsync();
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Assert.That(svgCount, Is.EqualTo(2),
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"Toggle should contain exactly two SVG icons (moon and sun)");
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}
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}
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