arcane_framework/test/services/theme/theme_service_test.dart

import "package:arcane_framework/src/services/theme/theme_service.dart";
import "package:flutter/material.dart";
import "package:flutter_test/flutter_test.dart";

void main() {
  group("ArcaneThemeService", () {
    setUp(() {
      ArcaneThemeService.I.reset();
    });

    test("default state is light theme, not following system", () {
      expect(ArcaneThemeService.I.isFollowingSystemTheme, isFalse);
      expect(ArcaneThemeService.I.currentThemeMode, ThemeMode.light);
      expect(ArcaneThemeService.I.currentTheme, isA<ThemeData>());
    });

    test("switchTheme toggles between light and dark", () {
      ArcaneThemeService.I.switchTheme(themeMode: ThemeMode.light);
      expect(ArcaneThemeService.I.currentThemeMode, ThemeMode.light);
      ArcaneThemeService.I.switchTheme();
      expect(ArcaneThemeService.I.currentThemeMode, ThemeMode.dark);
      ArcaneThemeService.I.switchTheme();
      expect(ArcaneThemeService.I.currentThemeMode, ThemeMode.light);
    });

    test("setDarkTheme and setLightTheme update themes", () {
      final customDark =
          ThemeData(primaryColor: Colors.red, brightness: Brightness.dark);
      final customLight =
          ThemeData(primaryColor: Colors.blue, brightness: Brightness.light);
      ArcaneThemeService.I.setDarkTheme(customDark);
      expect(ArcaneThemeService.I.dark, customDark);
      ArcaneThemeService.I.setLightTheme(customLight);
      expect(ArcaneThemeService.I.light, customLight);
    });

    test("dark and light setters delegate to setDarkTheme/setLightTheme", () {
      final customDark =
          ThemeData(primaryColor: Colors.teal, brightness: Brightness.dark);
      final customLight =
          ThemeData(primaryColor: Colors.amber, brightness: Brightness.light);

      ArcaneThemeService.I.dark = customDark;
      ArcaneThemeService.I.light = customLight;

      expect(ArcaneThemeService.I.dark, customDark);
      expect(ArcaneThemeService.I.light, customLight);
    });

    testWidgets("currentModeOf returns context themeMode", (tester) async {
      ArcaneThemeService.I.switchTheme(themeMode: ThemeMode.dark);

      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) {
              expect(
                ArcaneThemeService.I.currentModeOf(context),
                ThemeMode.dark,
              );
              return const SizedBox();
            },
          ),
        ),
      );
    });

    testWidgets("setInitialTheme handles explicit dark mode", (tester) async {
      ArcaneThemeService.I.switchTheme(themeMode: ThemeMode.dark);

      late BuildContext capturedContext;
      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) {
              capturedContext = context;
              return const SizedBox();
            },
          ),
        ),
      );

      ArcaneThemeService.I.setInitialTheme(capturedContext);
      expect(ArcaneThemeService.I.currentTheme.brightness, Brightness.dark);
    });

    test("reset restores defaults", () {
      ArcaneThemeService.I.setDarkTheme(
        ThemeData(primaryColor: Colors.red, brightness: Brightness.dark),
      );
      ArcaneThemeService.I.setLightTheme(
        ThemeData(primaryColor: Colors.blue, brightness: Brightness.light),
      );
      ArcaneThemeService.I.reset();
      expect(ArcaneThemeService.I.dark, ThemeData.dark());
      expect(ArcaneThemeService.I.light, ThemeData.light());
      expect(ArcaneThemeService.I.isFollowingSystemTheme, isFalse);
    });

    test("dispose does not throw", () {
      ArcaneThemeService.I.dispose();
    });
  });
}