chore: add integration tests

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

integration_test/extensions/wait_for.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_test/flutter_test.dart';
+
+/// Workaround for https://github.com/flutter/flutter/issues/88765
+extension WaitForExtension on WidgetTester {
+  Future<void> waitFor(
+    Finder finder, {
+    Duration timeout = const Duration(seconds: 20),
+    bool skipPumpAndSettle = false,
+  }) async {
+    final end = DateTime.now().add(timeout);
+
+    do {
+      if (DateTime.now().isAfter(end)) {
+        throw Exception('Timed out waiting for $finder');
+      }
+
+      if (!skipPumpAndSettle) {
+        await pumpAndSettle();
+      }
+      await Future.delayed(const Duration(milliseconds: 100));
+    } while (finder.evaluate().isEmpty);
+  }
+}
+
+extension MaybeUppercaseFinder on CommonFinders {
+  /// On Android some button labels are in uppercase while on iOS they
+  /// are not. This method tries both.
+  Finder maybeUppercaseText(
+    String text, {
+    bool findRichText = false,
+    bool skipOffstage = true,
+  }) {
+    try {
+      final finder = find.text(
+        text.toUpperCase(),
+        findRichText: findRichText,
+        skipOffstage: skipOffstage,
+      );
+      expect(finder, findsOneWidget);
+      return finder;
+    } catch (_) {
+      return find.text(
+        text,
+        findRichText: findRichText,
+        skipOffstage: skipOffstage,
+      );
+    }
+  }
+}