test: add tests for ChannelHeaderThemeData

packages/stream_chat_flutter/test/src/channel_header_theme_test.dart

@@ -0,0 +1,93 @@
+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('ChannelHeaderThemeData copyWith, ==, hashCode basics', () {
+    expect(const ChannelHeaderThemeData(),
+        const ChannelHeaderThemeData().copyWith());
+    expect(const ChannelHeaderThemeData().hashCode,
+        const ChannelHeaderThemeData().copyWith().hashCode);
+  });
+
+  group('ChannelHeaderThemeData lerps', () {
+    test(
+        '''Light ChannelHeaderThemeData lerps completely to dark ChannelHeaderThemeData''',
+        () {
+      expect(
+          const ChannelHeaderThemeData()
+              .lerp(_channelThemeControl, _channelThemeControlDark, 1),
+          _channelThemeControlDark);
+    });
+
+    test(
+        '''Light ChannelHeaderThemeData lerps halfway to dark ChannelHeaderThemeData''',
+        () {
+      expect(
+          const ChannelHeaderThemeData()
+              .lerp(_channelThemeControl, _channelThemeControlDark, 0.5),
+          _channelThemeControlDark);
+    });
+
+    test(
+        '''Dark ChannelHeaderThemeData lerps completely to light ChannelHeaderThemeData''',
+        () {
+      expect(
+          const ChannelHeaderThemeData()
+              .lerp(_channelThemeControlDark, _channelThemeControl, 1),
+          _channelThemeControl);
+    });
+  });
+
+  test('Merging dark and light themes results in a dark theme', () {
+    expect(_channelThemeControl.merge(_channelThemeControlDark),
+        _channelThemeControlDark);
+  });
+}
+
+final _channelThemeControl = ChannelHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: const Color(0xff101418),
+  titleStyle: TextTheme.light().headlineBold.copyWith(
+        color: const Color(0xffffffff),
+      ),
+  subtitleStyle: TextTheme.light().footnote.copyWith(
+        color: const Color(0xff7a7a7a),
+      ),
+);
+
+final _channelThemeControlMidLerp = ChannelHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: ColorTheme.light().barsBg,
+  titleStyle: TextTheme.light().headlineBold,
+  subtitleStyle: TextTheme.light().footnote.copyWith(
+        color: const Color(0xff7A7A7A),
+      ),
+);
+
+final _channelThemeControlDark = ChannelHeaderThemeData(
+  avatarTheme: AvatarThemeData(
+    borderRadius: BorderRadius.circular(20),
+    constraints: const BoxConstraints.tightFor(
+      height: 40,
+      width: 40,
+    ),
+  ),
+  color: ColorTheme.dark().barsBg,
+  titleStyle: TextTheme.dark().headlineBold,
+  subtitleStyle: TextTheme.dark().footnote.copyWith(
+        color: const Color(0xff7A7A7A),
+      ),
+);