Added login test

test/login_test.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:sign_in_flutter/login_page.dart';
+
+void main() {
+  Widget makeTestableWidget({Widget child}) {
+    return MaterialApp(
+      home: child,
+    );
+  }
+
+  testWidgets('Login screen test', (WidgetTester tester) async {
+    LoginPage loginScreen = LoginPage();
+
+    await tester.pumpWidget(makeTestableWidget(child: loginScreen));
+
+    expect(find.byType(FlutterLogo), findsOneWidget);
+    expect(find.byType(OutlineButton), findsOneWidget);
+    expect(find.text('Sign in with Google'), findsOneWidget);
+
+    print('Found Flutter logo.');
+    print('Button found.');
+    print('Found the login button text.');
+  });
+}