Add interval timer test

test/interval_timer_test.dart

@@ -0,0 +1,34 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. 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:openhiit/main.dart';
+
+void main() {
+  testWidgets('Load add interval timer smoke test',
+      (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const WorkoutTimer());
+
+    // Tap the '+' icon and trigger the add Workout or Timer page.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pumpAndSettle();
+
+    // Verify that the next page has loaded.
+    expect(find.text('Interval Timer'), findsOneWidget);
+    expect(find.text('Workout'), findsOneWidget);
+
+    // Tap to add a Workout.
+    await tester.tap(find.byIcon(Icons.fitness_center));
+    await tester.pumpAndSettle();
+
+    // Verify that the next page has loaded.
+    expect(find.text('Name this timer:'), findsOneWidget);
+  });
+}