Add channel & user parse test

test/channel_test.dart

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+import 'dart:convert';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:frosty/models/channel.dart';
+
+void main() {
+  test('Twitch channel should parse', () {
+    const sampleChannel = '''
+      {
+        "id":"43809710301",
+        "user_id":"71092938",
+        "user_login":"xqcow",
+        "user_name":"xQcOW",
+        "game_id":"508292",
+        "game_name":"Bloons TD 6",
+        "type":"live",
+        "title":"A shorter title...",
+        "viewer_count":50051,
+        "started_at":"2021-09-23T20:06:22Z",
+        "language":"en",
+        "thumbnail_url":"https://static-cdn.jtvnw.net/previews-ttv/live_user_xqcow-{width}x{height}.jpg",
+        "tag_ids":[
+          "e6bb8b34-4c28-4b5f-94ed-12c1ebf2d0e4",
+          "6ea6bca4-4712-4ab9-a906-e3336a9d8039",
+          "6606e54c-f92d-40f6-8257-74977889ccdd"
+          ],
+        "is_mature":false
+      }
+    ''';
+
+    final decoded = jsonDecode(sampleChannel);
+    final channel = Channel.fromJson(decoded);
+
+    expect(channel.id, '43809710301');
+    expect(channel.userId, '71092938');
+    expect(channel.userLogin, 'xqcow');
+    expect(channel.userName, 'xQcOW');
+    expect(channel.gameId, '508292');
+    expect(channel.gameName, 'Bloons TD 6');
+    expect(channel.type, 'live');
+    expect(channel.title, 'A shorter title...');
+    expect(channel.viewerCount, 50051);
+    expect(channel.startedAt, '2021-09-23T20:06:22Z');
+    expect(channel.language, 'en');
+    expect(channel.thumbnailUrl, 'https://static-cdn.jtvnw.net/previews-ttv/live_user_xqcow-{width}x{height}.jpg');
+    expect(channel.tagIds, ["e6bb8b34-4c28-4b5f-94ed-12c1ebf2d0e4", "6ea6bca4-4712-4ab9-a906-e3336a9d8039", "6606e54c-f92d-40f6-8257-74977889ccdd"]);
+    expect(channel.isMature, false);
+  });
+}

test/user_test.dart

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+import 'dart:convert';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:frosty/models/user.dart';
+
+void main() {
+  test('Twitch user should parse', () {
+    const sampleUser = '''
+      {
+        "id":"88888888",
+        "login":"bob",
+        "display_name":"Bob",
+        "type":"random type",
+        "broadcaster_type":"streamer",
+        "description":"random description",
+        "profile_image_url":"https://static-cdn.jtvnw.net/user-default-pictures-uv/ead5c8b2-a4c9-4724-b1dd-9f00b46cbd3d-profile_image-300x300.png",
+        "offline_image_url":"",
+        "view_count":94,
+        "created_at":"2013-09-25T00:32:05Z"
+      }
+    ''';
+
+    final decoded = jsonDecode(sampleUser);
+    final user = UserTwitch.fromJson(decoded);
+
+    expect(user.id, '88888888');
+    expect(user.login, 'bob');
+    expect(user.displayName, 'Bob');
+    expect(user.type, 'random type');
+    expect(user.broadcasterType, 'streamer');
+    expect(user.description, 'random description');
+    expect(user.profileImageUrl, 'https://static-cdn.jtvnw.net/user-default-pictures-uv/ead5c8b2-a4c9-4724-b1dd-9f00b46cbd3d-profile_image-300x300.png');
+    expect(user.offlineImageUrl, '');
+    expect(user.viewCount, 94);
+    expect(user.createdAt, '2013-09-25T00:32:05Z');
+  });
+}