Added Travis CI

.travis.yml

@@ -0,0 +1,18 @@
+language: dart
+dist: bionic
+addons:
+  apt:
+    packages:
+      - lib32stdc++6
+install:
+  - git clone https://github.com/flutter/flutter.git -b stable --depth 1
+  - export PATH=./flutter/bin:$PATH
+  - flutter doctor
+  - flutter --version
+script:
+  - flutter packages get
+  - flutter analyze --no-pub --no-current-package lib/ test/
+  - flutter test --no-pub test/
+cache:
+  directories:
+    - $HOME/.pub-cache

test/widget_test.dart

@@ -4,27 +4,14 @@
 // utility that Flutter provides. For example, you can send tap and scroll
 // gestures. You can also use WidgetTester to find child widgets in the widget
 // tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:messio/main.dart';
 
 void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+  testWidgets('Checking if hello world shows up', (WidgetTester tester) async {
     // Build our app and trigger a frame.
     await tester.pumpWidget(MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
+    expect(find.text('Hello World!'), findsOneWidget);
   });
 }