Add messages tests

test/file_message.test.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_chat_types/flutter_chat_types.dart' as types;
+import 'package:flutter_chat_ui/flutter_chat_ui.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('contains file message', (WidgetTester tester) async {
+    // Build the Chat widget.
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: Chat(
+            messages: const [
+              types.FileMessage(
+                author: types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+                id: 'id',
+                name: 'file',
+                size: 100,
+                uri: 'file',
+              )
+            ],
+            onSendPressed: (types.PartialText message) => {},
+            user: const types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+          ),
+        ),
+      ),
+    );
+
+    // Trigger a frame.
+    await tester.pump();
+
+    // Expect to find one FileMessage
+    expect(find.byType(FileMessage), findsOneWidget);
+  });
+}

test/flutter_chat_ui_test.dart

@@ -1,7 +1,13 @@
+import 'file_message.test.dart' as file_message_test;
+import 'image_message.test.dart' as image_message_test;
 import 'input.test.dart' as input_test;
+import 'text_message.test.dart' as text_message_test;
 import 'util.test.dart' as util_test;
 
 void main() {
+  file_message_test.main();
+  image_message_test.main();
   input_test.main();
+  text_message_test.main();
   util_test.main();
 }

test/image_message.test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_chat_types/flutter_chat_types.dart' as types;
+import 'package:flutter_chat_ui/flutter_chat_ui.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('contains image message', (WidgetTester tester) async {
+    // Build the Chat widget.
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: Chat(
+            messages: const [
+              types.ImageMessage(
+                author: types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+                height: 1080,
+                id: 'id',
+                name: 'image',
+                size: 100,
+                uri: 'image',
+                width: 1920,
+              )
+            ],
+            onSendPressed: (types.PartialText message) => {},
+            user: const types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+          ),
+        ),
+      ),
+    );
+
+    // Trigger a frame.
+    await tester.pump();
+
+    // Expect to find one ImageMessage
+    expect(find.byType(ImageMessage), findsOneWidget);
+  });
+}

test/text_message.test.dart

@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_chat_types/flutter_chat_types.dart' as types;
+import 'package:flutter_chat_ui/flutter_chat_ui.dart';
+import 'package:flutter_link_previewer/flutter_link_previewer.dart'
+    show LinkPreview;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('contains text message', (WidgetTester tester) async {
+    // Build the Chat widget.
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: Chat(
+            messages: const [
+              types.TextMessage(
+                author: types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+                id: 'id',
+                text: 'text',
+              )
+            ],
+            onSendPressed: (types.PartialText message) => {},
+            user: const types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+          ),
+        ),
+      ),
+    );
+
+    // Trigger a frame.
+    await tester.pump();
+
+    // Expect to fine one TextMessage
+    expect(find.byType(TextMessage), findsOneWidget);
+  });
+
+  testWidgets('contains link preview', (WidgetTester tester) async {
+    // Build the Chat widget.
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: Chat(
+            messages: const [
+              types.TextMessage(
+                author: types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+                id: 'id',
+                previewData: types.PreviewData(
+                  description: 'Flutter',
+                  link: 'https://flutter.dev/',
+                  title: 'Flutter',
+                ),
+                text: 'https://flutter.dev/',
+              )
+            ],
+            onPreviewDataFetched:
+                (types.TextMessage message, types.PreviewData previewData) =>
+                    {},
+            onSendPressed: (types.PartialText message) => {},
+            user: const types.User(id: '06c33e8b-e835-4736-80f4-63f44b66666c'),
+          ),
+        ),
+      ),
+    );
+
+    // Trigger a frame.
+    await tester.pump();
+
+    // Expect to find one LinkPreview
+    expect(find.byType(LinkPreview), findsOneWidget);
+  });
+}