test: add test for ChannelListHeaderTheme

packages/stream_chat_flutter/test/src/theme/channel_list_header_theme_test.dart

@@ -0,0 +1,94 @@
+import 'package:flutter/material.dart' hide TextTheme;
+import 'package:flutter_test/flutter_test.dart';
+import 'package:stream_chat_flutter/stream_chat_flutter.dart';
+
+void main() {
+  test('ChannelListHeaderThemeData copyWith, ==, hashCode basics', () {
+    expect(const ChannelListHeaderThemeData(),
+        const ChannelListHeaderThemeData().copyWith());
+    expect(const ChannelListHeaderThemeData().hashCode,
+        const ChannelListHeaderThemeData().copyWith().hashCode);
+  });
+
+  group('ChannelListHeaderThemeData lerps', () {
+    test(
+        '''Light ChannelListHeaderThemeData lerps completely to dark ChannelListHeaderThemeData''',
+        () {
+      expect(
+          const ChannelListHeaderThemeData().lerp(
+              _channelListHeaderThemeControl,
+              _channelListHeaderThemeControlDark,
+              1),
+          _channelListHeaderThemeControlDark);
+    });
+
+    test(
+        '''Light ChannelListHeaderThemeData lerps halfway to dark ChannelListHeaderThemeData''',
+        () {
+      expect(
+          const ChannelListHeaderThemeData().lerp(
+              _channelListHeaderThemeControl,
+              _channelListHeaderThemeControlDark,
+              0.5),
+          _channelListHeaderThemeControlMidLerp);
+    });
+
+    test(
+        '''Dark ChannelListHeaderThemeData lerps completely to light ChannelListHeaderThemeData''',
+        () {
+      expect(
+          const ChannelListHeaderThemeData().lerp(
+              _channelListHeaderThemeControlDark,
+              _channelListHeaderThemeControl,
+              1),
+          _channelListHeaderThemeControl);
+    });
+  });
+
+  test('Merging dark and light themes results in a dark theme', () {
+    expect(
+        _channelListHeaderThemeControl
+            .merge(_channelListHeaderThemeControlDark),
+        _channelListHeaderThemeControlDark);
+  });
+}
+
+final _channelListHeaderThemeControl = ChannelListHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: ColorTheme.light().barsBg,
+  titleStyle: TextTheme.light().headlineBold,
+);
+
+final _channelListHeaderThemeControlMidLerp = ChannelListHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: const Color(0xff87898b),
+  titleStyle: const TextStyle(
+    color: Color(0xff7f7f7f),
+    fontSize: 16,
+    fontWeight: FontWeight.bold,
+  ),
+);
+
+final _channelListHeaderThemeControlDark = ChannelListHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: ColorTheme.dark().barsBg,
+  titleStyle: TextTheme.dark().headlineBold,
+);