refactor(theme): the look comes from halkyon_ui

The theme, Noto Sans, the window sizes and the widgets every screen is
built of move to halkyon_ui (halkyon_shared), pinned to a signed commit
as the sync fork is, so Halkyon's other apps share them. Learn keeps its
own colours (the FSRS ratings, a starred star) as LearnColors beside the
theme, the CJK fonts with their licences, and its launch screen's word
and icon. Nothing on screen changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/test/app/long_names_test.dart

@@ -2,7 +2,6 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/profile/public_person.dart';
 import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/text_limits.dart';
 import 'package:halkyon_learn_flutter/src/feature/auth/data/auth_gateway.dart';
 import 'package:halkyon_learn_flutter/src/feature/auth/data/sign_in_addresses.dart';
 import 'package:halkyon_learn_flutter/src/feature/auth/model/auth_status.dart';
@@ -17,6 +16,7 @@ import 'package:halkyon_learn_flutter/src/feature/settings/data/settings_reposit
 import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_content.dart';
 import 'package:halkyon_learn_flutter/src/feature/tag/data/tag_repository.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
 import 'package:material_ui/material_ui.dart';
 
 import '../support/fake_auth_gateway.dart';

halkyon_learn_flutter/test/core/dependencies/person_scope_test.dart

@@ -1,9 +1,9 @@
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/asset/data/asset_repository.dart';
 import 'package:halkyon_learn_flutter/src/core/dependencies/dependencies_scope.dart';
 import 'package:halkyon_learn_flutter/src/core/dependencies/person_dependencies.dart';
 import 'package:halkyon_learn_flutter/src/core/dependencies/person_scope.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:halkyon_learn_flutter/src/core/sync/sync_service.dart';
 import 'package:halkyon_learn_flutter/src/feature/auth/model/auth_status.dart';
 import 'package:halkyon_learn_flutter/src/feature/card/data/card_deletions.dart';
@@ -132,7 +132,7 @@ void main() {
       DependenciesScope(
         dependencies: testDependencies(openPerson: (_) => open()),
         child: const MaterialApp(
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          localizationsDelegates: appLocalizationsDelegates,
           home: PersonScope(person: person, child: Text('Home')),
         ),
       ),

halkyon_learn_flutter/test/core/editor/editor_blocks_test.dart

@@ -3,11 +3,11 @@ import 'dart:convert';
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_document.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_content.dart';
@@ -246,7 +246,7 @@ void main() {
     ]).node;
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: RichContentView(
             content: Document(
@@ -286,7 +286,7 @@ void main() {
 
     Future<void> pump(WidgetTester tester, Widget child) => tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(body: child),
       ),
     );

halkyon_learn_flutter/test/core/editor/format_bar_test.dart

@@ -1,12 +1,12 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/format_bar.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/scripts.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:halkyon_learn_flutter/src/core/widget/content_languages.dart';
 import 'package:material_ui/material_ui.dart';
 
@@ -23,7 +23,7 @@ void main() {
     latest = content ?? RichContent.plain(text);
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: ContentLanguages(
           languages: (front: language, back: 'en'),
           child: Scaffold(
@@ -226,7 +226,7 @@ void main() {
       'smaller', (tester) async {
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: ListView(
             children: [

halkyon_learn_flutter/test/core/editor/link_and_clipboard_test.dart

@@ -1,12 +1,12 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/editor_clipboard.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/link.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:material_ui/material_ui.dart';
 
 /// Content of one line of [runs], each a text and its marks.
@@ -80,7 +80,7 @@ void main() {
     final latest = [...contents];
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: Column(
             children: [

halkyon_learn_flutter/test/core/editor/math_test.dart

@@ -1,14 +1,14 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter_math_fork/flutter_math.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/math_view.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_document.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/app_theme.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_theme.dart';
 import 'package:material_ui/material_ui.dart';
 
 void main() {
@@ -47,8 +47,8 @@ void main() {
       addTearDown(tester.view.reset);
       await tester.pumpWidget(
         MaterialApp(
-          theme: appTheme(Brightness.light),
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          theme: learnTheme(Brightness.light),
+          localizationsDelegates: appLocalizationsDelegates,
           home: Scaffold(
             body: SizedBox(
               height: 600,
@@ -208,8 +208,8 @@ void main() {
     Future<void> show(WidgetTester tester, RichContent content) async {
       await tester.pumpWidget(
         MaterialApp(
-          theme: appTheme(Brightness.light),
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          theme: learnTheme(Brightness.light),
+          localizationsDelegates: appLocalizationsDelegates,
           home: Scaffold(body: RichContentView(content: content)),
         ),
       );

halkyon_learn_flutter/test/core/editor/rich_content_editor_test.dart

@@ -1,8 +1,8 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:material_ui/material_ui.dart';
 
 void main() {
@@ -10,7 +10,7 @@ void main() {
       'and bringing the selection into view comes to an end', (tester) async {
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: ListView(
             children: [

halkyon_learn_flutter/test/core/editor/rich_content_view_test.dart

@@ -1,11 +1,11 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/ruby.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
 import 'package:material_ui/material_ui.dart';
 
 void main() {
@@ -28,7 +28,7 @@ void main() {
   Future<void> show(WidgetTester tester, RichContent content) async {
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: ListView(children: [RichContentView(content: content)]),
         ),
@@ -152,7 +152,7 @@ void main() {
     var tapped = 0;
     await tester.pumpWidget(
       MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(
           body: ListView(
             children: [
@@ -198,7 +198,7 @@ void main() {
       addTearDown(tester.view.reset);
       await tester.pumpWidget(
         MaterialApp(
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          localizationsDelegates: appLocalizationsDelegates,
           home: Scaffold(
             body: ListView(
               children: [

halkyon_learn_flutter/test/core/editor/text_blocks_test.dart

@@ -1,12 +1,12 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_document.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/app_theme.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_theme.dart';
 import 'package:material_ui/material_ui.dart';
 
 void main() {
@@ -18,8 +18,8 @@ void main() {
     addTearDown(tester.view.reset);
     await tester.pumpWidget(
       MaterialApp(
-        theme: appTheme(Brightness.light),
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        theme: learnTheme(Brightness.light),
+        localizationsDelegates: appLocalizationsDelegates,
         home: Scaffold(body: child),
       ),
     );

halkyon_learn_flutter/test/core/editor/youtube_block_test.dart

@@ -1,13 +1,13 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/dependencies/dependencies_scope.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_document.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_editor.dart';
 import 'package:halkyon_learn_flutter/src/core/editor/rich_content_view.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/app_theme.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_theme.dart';
 import 'package:material_ui/material_ui.dart';
 
 import '../../support/fake_youtube_videos.dart';
@@ -24,8 +24,8 @@ void main() {
       DependenciesScope(
         dependencies: testDependencies(videos: videos),
         child: MaterialApp(
-          theme: appTheme(Brightness.light),
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          theme: learnTheme(Brightness.light),
+          localizationsDelegates: appLocalizationsDelegates,
           home: Scaffold(body: child),
         ),
       ),

halkyon_learn_flutter/test/core/layout/window_size_test.dart

@@ -1,24 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/src/core/layout/window_size.dart';
-
-void main() {
-  test("Material 3's classes, by the window's width", () {
-    expect(WindowSize.fromWidth(0), WindowSize.compact);
-    expect(WindowSize.fromWidth(599.9), WindowSize.compact);
-    expect(WindowSize.fromWidth(600), WindowSize.medium);
-    expect(WindowSize.fromWidth(839.9), WindowSize.medium);
-    expect(WindowSize.fromWidth(840), WindowSize.expanded);
-    expect(WindowSize.fromWidth(1199.9), WindowSize.expanded);
-    expect(WindowSize.fromWidth(1200), WindowSize.large);
-    expect(WindowSize.fromWidth(1599.9), WindowSize.large);
-    expect(WindowSize.fromWidth(1600), WindowSize.extraLarge);
-  });
-
-  test('a rail from medium on, desktop layouts from expanded on', () {
-    expect(WindowSize.compact.isAtLeastMedium, isFalse);
-    expect(WindowSize.medium.isAtLeastMedium, isTrue);
-    expect(WindowSize.medium.isAtLeastExpanded, isFalse);
-    expect(WindowSize.expanded.isAtLeastExpanded, isTrue);
-    expect(WindowSize.extraLarge.isAtLeastExpanded, isTrue);
-  });
-}

halkyon_learn_flutter/test/core/router/app_shell_test.dart

@@ -2,11 +2,6 @@ import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
 import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/brand.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/palette_color.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/floating_navigation_bar.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/screen_tint.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/top_gradient.dart';
 import 'package:halkyon_learn_flutter/src/feature/card/data/card_repository.dart';
 import 'package:halkyon_learn_flutter/src/feature/card/model/card_content.dart';
 import 'package:halkyon_learn_flutter/src/feature/home/widget/activity_heatmap.dart';
@@ -15,6 +10,7 @@ import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload
 import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_content.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/widget/library_screen.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/widget/studyset_screen.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
 import 'package:material_ui/material_ui.dart';
 
 import '../../support/fake_card_gateway.dart';

halkyon_learn_flutter/test/core/theme/cjk_fonts_test.dart

@@ -0,0 +1,122 @@
+import 'dart:convert';
+import 'dart:ui' as ui;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/cjk_fonts.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_theme.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
+import 'package:material_ui/material_ui.dart';
+
+/// Loads the bundled font [family] from [files], as the app does at start.
+Future<void> load(String family, List<String> files) async {
+  final loader = FontLoader(family);
+  for (final file in files) {
+    loader.addFont(rootBundle.load(file));
+  }
+  await loader.load();
+}
+
+/// How many pixels [text] inks in [family] at [weight]: heavier strokes ink
+/// more.
+Future<int> ink(String text, String family, FontWeight weight) async {
+  final painter = TextPainter(
+    text: TextSpan(
+      text: text,
+      style: TextStyle(
+        fontFamily: family,
+        fontSize: 40,
+        fontWeight: weight,
+        color: const Color(0xFF000000),
+      ),
+    ),
+    textDirection: TextDirection.ltr,
+  )..layout();
+  final recorder = ui.PictureRecorder();
+  painter.paint(Canvas(recorder), Offset.zero);
+  final image = await recorder.endRecording().toImage(
+    painter.width.ceil(),
+    painter.height.ceil(),
+  );
+  final pixels = (await image.toByteData())!;
+  var inked = 0;
+  for (var alpha = 3; alpha < pixels.lengthInBytes; alpha += 4) {
+    if (pixels.getUint8(alpha) > 128) {
+      inked++;
+    }
+  }
+  return inked;
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test("the theme sets text in halkyon_ui's Noto Sans, with Noto Sans JP "
+      'for what it lacks', () {
+    for (final brightness in Brightness.values) {
+      final style = learnTheme(brightness).textTheme.bodyLarge!;
+      expect(style.fontFamily, 'packages/halkyon_ui/Noto Sans');
+      expect(style.fontFamilyFallback, [
+        'Noto Sans JP',
+        'Noto Sans SC',
+        'Noto Sans TC',
+        'Noto Sans KR',
+      ]);
+    }
+  });
+
+  test('the app bundles every font the theme names', () async {
+    final manifest = jsonDecode(
+      await rootBundle.loadString('FontManifest.json'),
+    ) as List<dynamic>;
+    final families = {
+      for (final font in manifest.cast<Map<String, dynamic>>())
+        font['family'] as String,
+    };
+
+    expect(families, containsAll([appFontFamily, ...appFontFallback]));
+  });
+
+  test('each bundled font draws every weight from its one file', () async {
+    await load(appFontFamily, [
+      'packages/halkyon_ui/assets/fonts/NotoSans-Variable.ttf',
+    ]);
+    for (final region in ['JP', 'SC', 'TC', 'KR']) {
+      await load('Noto Sans $region', [
+        'assets/fonts/NotoSans$region-Variable.otf',
+      ]);
+    }
+
+    for (final (family, text) in [
+      (appFontFamily, 'Ἀθῆναι Halkyon'),
+      ('Noto Sans JP', '日本語のかな'),
+      ('Noto Sans SC', '我们说中文'),
+      ('Noto Sans TC', '我們說中文'),
+      ('Noto Sans KR', '한국어 공부'),
+    ]) {
+      final regular = await ink(text, family, FontWeight.w400);
+      final bold = await ink(text, family, FontWeight.w700);
+      expect(bold, greaterThan(regular * 1.2), reason: family);
+    }
+  });
+
+  test("the fonts' licences join the licence list", () async {
+    registerFontLicenses();
+    registerCjkFontLicenses();
+
+    final packages = {
+      await for (final entry in LicenseRegistry.licenses) ...entry.packages,
+    };
+    expect(
+      packages,
+      containsAll([
+        'Noto Sans',
+        'Noto Sans JP',
+        'Noto Sans SC',
+        'Noto Sans TC',
+        'Noto Sans KR',
+      ]),
+    );
+  });
+}

halkyon_learn_flutter/test/core/theme/learn_theme_test.dart

@@ -0,0 +1,47 @@
+import 'dart:math';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_colors.dart';
+import 'package:halkyon_learn_flutter/src/core/theme/learn_theme.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
+import 'package:material_ui/material_ui.dart';
+
+/// WCAG's contrast ratio of two colours, from 1 (none) to 21.
+double _contrast(Color a, Color b) {
+  final (lighter, darker) = (
+    max(a.computeLuminance(), b.computeLuminance()),
+    min(a.computeLuminance(), b.computeLuminance()),
+  );
+  return (lighter + 0.05) / (darker + 0.05);
+}
+
+void main() {
+  for (final brightness in Brightness.values) {
+    test("$brightness: halkyon_ui's theme, with Learn's rating and starred "
+        'colours beside its status colours', () {
+      final theme = learnTheme(brightness);
+
+      expect(theme.colorScheme, appTheme(brightness).colorScheme);
+      expect(theme.extras, isA<ThemeExtras>());
+      expect(
+        theme.learnColors,
+        brightness == Brightness.light ? LearnColors.light : LearnColors.dark,
+      );
+    });
+
+    test('$brightness: a starred star stands out from the cards, as a '
+        'graphic must (3 to 1)', () {
+      final theme = learnTheme(brightness);
+
+      for (final surface in [
+        theme.colorScheme.surface,
+        theme.colorScheme.surfaceContainerLow,
+      ]) {
+        expect(
+          _contrast(theme.learnColors.starred, surface),
+          greaterThanOrEqualTo(3),
+        );
+      }
+    });
+  }
+}

halkyon_learn_flutter/test/core/theme/theme_test.dart

@@ -1,95 +0,0 @@
-import 'dart:math';
-
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/app_theme.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/brand.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/palette_color.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/theme_extras.dart';
-import 'package:material_ui/material_ui.dart';
-
-/// WCAG's contrast ratio of two colours, from 1 (none) to 21.
-double _contrast(Color a, Color b) {
-  final (lighter, darker) = (
-    max(a.computeLuminance(), b.computeLuminance()),
-    min(a.computeLuminance(), b.computeLuminance()),
-  );
-  return (lighter + 0.05) / (darker + 0.05);
-}
-
-void main() {
-  group('the picker palette', () {
-    test('has the 20 colours content can be given', () {
-      expect(PaletteColor.values, hasLength(20));
-    });
-
-    for (final color in PaletteColor.values) {
-      test(
-        '${color.name}: its text colour is readable on its fill (WCAG AA)',
-        () {
-          expect(
-            _contrast(color.foreground, color.background),
-            greaterThanOrEqualTo(4.5),
-          );
-        },
-      );
-    }
-
-    test(
-      'finds a colour by its stored name, and nothing for an unknown one',
-      () {
-        expect(PaletteColor.byName('cobalt'), PaletteColor.cobalt);
-        expect(PaletteColor.byName('ultraviolet'), isNull);
-        expect(PaletteColor.byName(null), isNull);
-      },
-    );
-  });
-
-  group('the theme', () {
-    for (final brightness in Brightness.values) {
-      test('$brightness: Material 3, with the status and rating colours', () {
-        final theme = appTheme(brightness);
-
-        expect(theme.useMaterial3, isTrue);
-        expect(theme.colorScheme.brightness, brightness);
-        expect(theme.extras, isA<ThemeExtras>());
-      });
-    }
-
-    test('light: cobalt is the primary colour, copper the accent', () {
-      final scheme = appTheme(Brightness.light).colorScheme;
-
-      expect(scheme.primary, Brand.primary);
-      expect(scheme.tertiary, Brand.accent);
-    });
-
-    test("dark: the primary colour's text stays readable", () {
-      final scheme = appTheme(Brightness.dark).colorScheme;
-
-      expect(
-        _contrast(scheme.onPrimary, scheme.primary),
-        greaterThanOrEqualTo(4.5),
-      );
-      expect(
-        _contrast(scheme.onSurface, scheme.surface),
-        greaterThanOrEqualTo(4.5),
-      );
-    });
-
-    for (final brightness in Brightness.values) {
-      test('$brightness: a starred star stands out from the cards, as a '
-          'graphic must (3 to 1)', () {
-        final theme = appTheme(brightness);
-
-        for (final surface in [
-          theme.colorScheme.surface,
-          theme.colorScheme.surfaceContainerLow,
-        ]) {
-          expect(
-            _contrast(theme.extras.starred, surface),
-            greaterThanOrEqualTo(3),
-          );
-        }
-      });
-    }
-  });
-}

halkyon_learn_flutter/test/core/widget/adaptive_sheet_test.dart

@@ -1,217 +0,0 @@
-import 'package:flutter/foundation.dart';
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/adaptive_sheet.dart';
-import 'package:material_ui/material_ui.dart';
-
-void main() {
-  /// Opens a sheet titled "New studyset" with [body] and a Create button, in
-  /// a window [width] wide, with a status bar [statusBar] high on top.
-  Future<void> open(
-    WidgetTester tester, {
-    required double width,
-    Widget body = const Text('Body'),
-    double statusBar = 0,
-    bool busy = false,
-  }) async {
-    tester.view.physicalSize = Size(width, 900);
-    tester.view.devicePixelRatio = 1;
-    tester.view.padding = FakeViewPadding(top: statusBar);
-    tester.view.viewPadding = FakeViewPadding(top: statusBar);
-    addTearDown(tester.view.reset);
-    await tester.pumpWidget(
-      MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
-        supportedLocales: AppLocalizations.supportedLocales,
-        home: Scaffold(
-          body: Builder(
-            builder: (context) => TextButton(
-              onPressed: () => showAdaptiveSheet<void>(
-                context,
-                swipeable: !busy,
-                builder: (context) => SheetScaffold(
-                  title: 'New studyset',
-                  busy: busy,
-                  body: body,
-                  footer: FilledButton(
-                    onPressed: () {},
-                    child: const Text('Create'),
-                  ),
-                ),
-              ),
-              child: const Text('Open'),
-            ),
-          ),
-        ),
-      ),
-    );
-    await tester.tap(find.text('Open'));
-    await tester.pumpAndSettle();
-  }
-
-  testWidgets('is a bottom sheet below expanded windows', (tester) async {
-    await open(tester, width: 839);
-
-    expect(find.byType(BottomSheet), findsOneWidget);
-    expect(find.byType(Dialog), findsNothing);
-  });
-
-  testWidgets('is a dialog from expanded windows on', (tester) async {
-    await open(tester, width: 840);
-
-    expect(find.byType(Dialog), findsOneWidget);
-    expect(find.byType(BottomSheet), findsNothing);
-  });
-
-  for (final width in [400.0, 1200.0]) {
-    testWidgets('keeps its close button and footer in view above a long body '
-        '(${width.round()} wide)', (tester) async {
-      await open(
-        tester,
-        width: width,
-        body: Column(
-          children: [for (var i = 0; i < 80; i++) Text('Line $i')],
-        ),
-      );
-
-      expect(find.byTooltip('Close').hitTestable(), findsOneWidget);
-      expect(find.text('Create').hitTestable(), findsOneWidget);
-    });
-  }
-
-  testWidgets('stays below the status bar with the keyboard open', (
-    tester,
-  ) async {
-    await open(
-      tester,
-      width: 400,
-      statusBar: 48,
-      body: Column(
-        children: [for (var i = 0; i < 80; i++) Text('Line $i')],
-      ),
-    );
-
-    tester.view.viewInsets = const FakeViewPadding(bottom: 400);
-    await tester.pumpAndSettle();
-
-    expect(tester.getTopLeft(find.byType(BottomSheet)).dy, 48);
-    expect(find.byTooltip('Close').hitTestable(), findsOneWidget);
-    expect(find.text('Create').hitTestable(), findsOneWidget);
-  });
-
-  testWidgets('closes with its close button', (tester) async {
-    await open(tester, width: 400);
-
-    await tester.tap(find.byTooltip('Close'));
-    await tester.pumpAndSettle();
-
-    expect(find.text('New studyset'), findsNothing);
-  });
-
-  testWidgets('while busy, its close button is off and back keeps it open', (
-    tester,
-  ) async {
-    await open(tester, width: 400, busy: true);
-
-    expect(
-      tester
-          .widget<IconButton>(
-            find.ancestor(
-              of: find.byTooltip('Close'),
-              matching: find.byType(IconButton),
-            ),
-          )
-          .onPressed,
-      isNull,
-    );
-    await tester.binding.handlePopRoute();
-    await tester.pumpAndSettle();
-    expect(find.text('New studyset'), findsOneWidget);
-  });
-
-  group('a body longer than the sheet', () {
-    final tall = Column(
-      children: [for (var i = 0; i < 40; i++) const Text('Line')],
-    );
-    Finder below() => find.byKey(SheetScaffold.moreBelowKey);
-    Finder above() => find.byKey(SheetScaffold.moreAboveKey);
-
-    testWidgets('shows a line above the buttons while more lies below, and '
-        'one under the title while more lies above', (tester) async {
-      // As a dialog: a modal bottom sheet takes a test's drag itself.
-      await open(tester, width: 1000, body: tall);
-
-      expect(below(), findsOneWidget);
-      expect(above(), findsNothing);
-
-      await tester.drag(
-        find.byType(SingleChildScrollView),
-        const Offset(0, -300),
-      );
-      await tester.pumpAndSettle();
-      expect(below(), findsOneWidget);
-      expect(above(), findsOneWidget);
-      expect(
-        tester
-            .state<ScrollableState>(
-              find.descendant(
-                of: find.byType(SingleChildScrollView),
-                matching: find.byType(Scrollable),
-              ),
-            )
-            .position
-            .pixels,
-        greaterThan(0),
-        reason: 'the line coming keeps where the body was scrolled to',
-      );
-
-      await tester.drag(
-        find.byType(SingleChildScrollView),
-        const Offset(0, -5000),
-      );
-      await tester.pumpAndSettle();
-      expect(below(), findsNothing);
-      expect(above(), findsOneWidget);
-    });
-
-    testWidgets('has a scrollbar, always shown on the desktop', (tester) async {
-      debugDefaultTargetPlatformOverride = TargetPlatform.linux;
-      addTearDown(() => debugDefaultTargetPlatformOverride = null);
-      await open(tester, width: 1000, body: tall);
-
-      final scrollbar = tester.widget<Scrollbar>(find.byType(Scrollbar));
-      expect(scrollbar.thumbVisibility, isTrue);
-      debugDefaultTargetPlatformOverride = null;
-    });
-  });
-
-  testWidgets('a body that fits shows no lines', (tester) async {
-    await open(tester, width: 400);
-
-    expect(find.byKey(SheetScaffold.moreBelowKey), findsNothing);
-    expect(find.byKey(SheetScaffold.moreAboveKey), findsNothing);
-  });
-
-  testWidgets("the body keeps clear of the scroll view's edges, where it is "
-      'cut and the scrollbar runs', (tester) async {
-    for (final width in [400.0, 1000.0]) {
-      await open(
-        tester,
-        width: width,
-        body: const TextField(
-          decoration: InputDecoration(border: OutlineInputBorder()),
-        ),
-      );
-
-      final scrolling = tester.getRect(find.byType(SingleChildScrollView));
-      final field = tester.getRect(find.byType(TextField));
-      expect(field.left - scrolling.left, greaterThanOrEqualTo(16));
-      expect(scrolling.right - field.right, greaterThanOrEqualTo(16));
-      // The title and the button stay in line with the body.
-      expect(tester.getTopLeft(find.text('New studyset')).dx, field.left);
-      expect(tester.getTopRight(find.byType(FilledButton)).dx, field.right);
-      await tester.tap(find.byTooltip('Close'));
-      await tester.pumpAndSettle();
-    }
-  });
-}

halkyon_learn_flutter/test/core/widget/app_launch_screen_test.dart

@@ -0,0 +1,25 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
+import 'package:halkyon_learn_flutter/src/core/l10n/app_languages.dart';
+import 'package:halkyon_learn_flutter/src/core/widget/app_launch_screen.dart';
+import 'package:material_ui/material_ui.dart';
+
+void main() {
+  testWidgets('shows the kingfisher, and "Halkyon" over "Learn", read out '
+      "as the app's name", (tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        localizationsDelegates: appLocalizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: AppLaunchScreen(),
+      ),
+    );
+
+    expect(find.byType(Image), findsOneWidget);
+    final brand = tester.getRect(find.text('Halkyon'));
+    final product = tester.getRect(find.text('Learn'));
+    expect(product.top, greaterThanOrEqualTo(brand.bottom - 1));
+    expect(product.center.dx, moreOrLessEquals(brand.center.dx));
+    expect(find.bySemanticsLabel('Halkyon Learn'), findsOneWidget);
+  });
+}

halkyon_learn_flutter/test/core/widget/app_refresh_indicator_test.dart

@@ -1,44 +0,0 @@
-import 'dart:async';
-
-import 'package:expressive_loading_indicator/expressive_loading_indicator.dart';
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/src/core/theme/app_theme.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/app_loading_indicator.dart';
-import 'package:material_ui/material_ui.dart';
-
-void main() {
-  testWidgets("pulled down, it refreshes with the app's spinner, Material 3 "
-      "Expressive's, not Flutter's older one", (tester) async {
-    final refreshing = Completer<void>();
-    var refreshes = 0;
-    await tester.pumpWidget(
-      MaterialApp(
-        theme: appTheme(Brightness.light),
-        home: Scaffold(
-          body: AppRefreshIndicator(
-            onRefresh: () {
-              refreshes++;
-              return refreshing.future;
-            },
-            child: ListView(
-              physics: const AlwaysScrollableScrollPhysics(),
-              children: const [Text('Japanese')],
-            ),
-          ),
-        ),
-      ),
-    );
-    expect(find.byType(ExpressiveLoadingIndicator), findsNothing);
-
-    await tester.fling(find.text('Japanese'), const Offset(0, 400), 1000);
-    await tester.pump();
-    await tester.pump(const Duration(milliseconds: 300));
-    expect(refreshes, 1);
-    expect(find.byType(ExpressiveLoadingIndicator), findsOneWidget);
-    expect(find.byType(CircularProgressIndicator), findsNothing);
-
-    refreshing.complete();
-    await tester.pumpAndSettle();
-    expect(find.byType(ExpressiveLoadingIndicator), findsNothing);
-  });
-}

halkyon_learn_flutter/test/core/widget/count_stepper_test.dart

@@ -1,17 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/count_stepper.dart';
-
-void main() {
-  test('steps go to the next multiple of the step, never below the first', () {
-    expect(stepUp(12, 5, max: 100), 15);
-    expect(stepUp(15, 5, max: 100), 20);
-    expect(stepUp(98, 5, max: 100), 100);
-    expect(stepDown(12, 5), 10);
-    expect(stepDown(15, 5), 10);
-    expect(stepDown(7, 5), 5);
-    expect(canStepDown(5, 5), isFalse);
-    expect(canStepDown(6, 5), isTrue);
-    expect(stepUp(1, 25, max: 1000), 25);
-    expect(stepDown(230, 25), 225);
-  });
-}

halkyon_learn_flutter/test/core/widget/found_by_id_test.dart

@@ -1,101 +0,0 @@
-import 'dart:async';
-
-import 'package:flutter_test/flutter_test.dart';
-import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/app_loading_indicator.dart';
-import 'package:halkyon_learn_flutter/src/core/widget/found_by_id.dart';
-import 'package:material_ui/material_ui.dart';
-
-void main() {
-  late StreamController<List<String>> items;
-
-  setUp(() => items = StreamController());
-  tearDown(() => items.close());
-
-  /// Opens the screen of the item [id] over a first screen.
-  Future<void> open(WidgetTester tester, String id) async {
-    await tester.pumpWidget(
-      MaterialApp(
-        localizationsDelegates: AppLocalizations.localizationsDelegates,
-        supportedLocales: AppLocalizations.supportedLocales,
-        home: Builder(
-          builder: (context) => TextButton(
-            onPressed: () => Navigator.of(context).push(
-              MaterialPageRoute<void>(
-                builder: (context) => FoundById<String>(
-                  id: id,
-                  items: () => items.stream,
-                  idOf: (item) => item,
-                  builder: (item, items) =>
-                      Scaffold(body: Text('Item $item of ${items.length}')),
-                ),
-              ),
-            ),
-            child: const Text('Open'),
-          ),
-        ),
-      ),
-    );
-    await tester.tap(find.text('Open'));
-    // Through the opening transition; the spinner never settles.
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1));
-  }
-
-  testWidgets('shows a spinner until the list arrives, then the item', (
-    tester,
-  ) async {
-    await open(tester, 'a');
-    expect(find.byType(AppLoadingIndicator), findsOneWidget);
-
-    items.add(['a', 'b']);
-    await tester.pump();
-
-    expect(find.text('Item a of 2'), findsOneWidget);
-    expect(find.byType(AppLoadingIndicator), findsNothing);
-  });
-
-  testWidgets('says that an item missing from the list no longer exists', (
-    tester,
-  ) async {
-    await open(tester, 'c');
-
-    items.add(['a', 'b']);
-    await tester.pump();
-
-    expect(find.textContaining('no longer exists'), findsOneWidget);
-  });
-
-  testWidgets('says so once the item goes while its screen is open', (
-    tester,
-  ) async {
-    await open(tester, 'a');
-    items.add(['a']);
-    await tester.pump();
-
-    // Deleted on another device, say.
-    items.add([]);
-    await tester.pump();
-
-    expect(find.text('Item a of 1'), findsNothing);
-    expect(find.textContaining('no longer exists'), findsOneWidget);
-  });
-
-  testWidgets('a screen that closes as its item goes keeps showing the item '
-      'on its way out', (tester) async {
-    await open(tester, 'a');
-    items.add(['a']);
-    await tester.pump();
-
-    // As when the screen deleted its item and closes.
-    Navigator.of(tester.element(find.text('Item a of 1'))).pop();
-    items.add([]);
-    await tester.pump();
-    await tester.pump(const Duration(milliseconds: 100));
-
-    expect(find.text('Item a of 1'), findsOneWidget);
-    expect(find.textContaining('no longer exists'), findsNothing);
-    await tester.pumpAndSettle();
-    expect(find.text('Open'), findsOneWidget);
-  });
-}