test: add ui tests for DapForm widget

test/features/dap/dap_form_test.dart

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+import 'package:dap/dap.dart';
+import 'package:didpay/features/dap/dap_form.dart';
+import 'package:didpay/features/dap/dap_qr_tile.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import '../../helpers/widget_helpers.dart';
+
+void main() async {
+  group('DapForm', () {
+    Widget dapFormTestWidget({AsyncValue<Dap>? dap, String? dapText}) =>
+        WidgetHelpers.testableWidget(
+          child: DapForm(
+            buttonTitle: 'Next',
+            dapText: ValueNotifier<String?>(dapText),
+            dap: ValueNotifier<AsyncValue<Dap>?>(dap),
+            onSubmit: (_, __) async {},
+          ),
+        );
+
+    testWidgets('should show button title', (tester) async {
+      await tester.pumpWidget(dapFormTestWidget());
+      await tester.pumpAndSettle();
+
+      expect(find.widgetWithText(FilledButton, 'Next'), findsOneWidget);
+    });
+
+    testWidgets('should show QR Code CTA', (tester) async {
+      await tester.pumpWidget(dapFormTestWidget());
+      await tester.pumpAndSettle();
+
+      expect(
+        find.widgetWithText(
+          DapQrTile,
+          "Don't know their DAP? Scan their QR code instead",
+        ),
+        findsOneWidget,
+      );
+    });
+
+    testWidgets('should show CircularProgressIndicator when DAP is loading',
+        (tester) async {
+      await tester.pumpWidget(dapFormTestWidget());
+      await tester.pump(Duration.zero);
+
+      expect(find.byType(CircularProgressIndicator), findsNothing);
+
+      await tester.pumpWidget(dapFormTestWidget(dap: const AsyncLoading()));
+      await tester.pump(Duration.zero);
+
+      expect(find.byType(CircularProgressIndicator), findsOneWidget);
+    });
+
+    testWidgets(
+        'should show error message when the Next button is tapped and the dap text is invalid',
+        (tester) async {
+      const invalidDapText = 'invalid_dap_text';
+      const expectedErrorMessage = 'Invalid DAP';
+
+      await tester.pumpWidget(dapFormTestWidget(dapText: invalidDapText));
+      await tester.pumpAndSettle();
+
+      expect(find.text(expectedErrorMessage), findsNothing);
+
+      await tester.tap(find.widgetWithText(FilledButton, 'Next'));
+      await tester.pumpAndSettle();
+
+      expect(find.text(expectedErrorMessage), findsOneWidget);
+    });
+
+    testWidgets(
+        'should resolve DAP without errors when the Next button is tapped and the dap text is valid',
+        (tester) async {
+      const validDapText = '@moegrammer/didpay.me';
+
+      await tester.pumpWidget(dapFormTestWidget(dapText: validDapText));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.widgetWithText(FilledButton, 'Next'));
+      await tester.pumpAndSettle();
+
+      expect(find.text('Invalid DAP'), findsNothing);
+    });
+  });
+}