Increased coverage for integration dns tests

integration_test/dns/lookup/lookup_test.dart

@@ -36,7 +36,12 @@ void main() {
 
       await tester.pumpAndSettle(const Duration(seconds: 2));
 
-      expect(find.byType(AdaptiveListTile), findsAny);
+      final pingWidget = find.byKey(WidgetKey.dnsResultTile.key).first;
+      await tester.tap(pingWidget);
+
+      await tester.pumpAndSettle();
+
+      expect(find.byType(Scaffold), findsOneWidget);
     });
   });
 }

integration_test/dns/reverse_lookup/reverse_lookup.dart

@@ -40,7 +40,80 @@ void main() {
 
       await tester.pumpAndSettle(const Duration(seconds: 2));
 
-      expect(find.text("maa03s29-in-f14.1e100.net"), findsOne);
+      final textWidget = find.text("maa03s29-in-f14.1e100.net");
+
+      expect(textWidget, findsOneWidget);
+      await tester.tap(textWidget);
+      await tester.pumpAndSettle();
+    });
+
+    testWidgets('tap on the reverse DNS lookup button, verify error returned',
+        (tester) async {
+      // Load app widget.
+      await tester.pumpWidget(const MyApp(true));
+      await tester.pumpAndSettle();
+
+      // Verify that there are 4 widgets at homepage
+      expect(find.bySubtype<AdaptiveListTile>(), findsAtLeastNWidgets(4));
+
+      // Finds the scan for devices button to tap on.
+      final reverseDnsLookupButton =
+          find.byKey(WidgetKey.reverseDnsLookupButton.key);
+
+      // Emulate a tap on the button.
+      await tester.tap(reverseDnsLookupButton);
+      await tester.pumpAndSettle();
+
+      expect(
+        find.text(StringValue.reverseDnsLookupEmptyPlaceholder),
+        findsOneWidget,
+      );
+
+      await tester.enterText(
+        find.byType(TextFormField),
+        '172.217.160.',
+      );
+      await tester.pumpAndSettle();
+
+      final submitButton = find.byKey(WidgetKey.basePageSubmitButton.key);
+      await tester.tap(submitButton);
+      expect(find.byType(Scaffold), findsOneWidget);
+      await tester.pumpAndSettle();
+    });
+
+    testWidgets(
+        'tap on the reverse DNS lookup button, verify reverse address not found returned',
+        (tester) async {
+      // Load app widget.
+      await tester.pumpWidget(const MyApp(true));
+      await tester.pumpAndSettle();
+
+      // Verify that there are 4 widgets at homepage
+      expect(find.bySubtype<AdaptiveListTile>(), findsAtLeastNWidgets(4));
+
+      // Finds the scan for devices button to tap on.
+      final reverseDnsLookupButton =
+          find.byKey(WidgetKey.reverseDnsLookupButton.key);
+
+      // Emulate a tap on the button.
+      await tester.tap(reverseDnsLookupButton);
+      await tester.pumpAndSettle();
+
+      expect(
+        find.text(StringValue.reverseDnsLookupEmptyPlaceholder),
+        findsOneWidget,
+      );
+
+      await tester.enterText(
+        find.byType(TextFormField),
+        '0.0.0.0',
+      );
+      await tester.pumpAndSettle();
+
+      final submitButton = find.byKey(WidgetKey.basePageSubmitButton.key);
+      await tester.tap(submitButton);
+      expect(find.byType(Scaffold), findsOneWidget);
+      await tester.pumpAndSettle();
     });
   });
 }

lib/pages/dns/dns_page.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:vernet/pages/base_page.dart';
 import 'package:vernet/ui/adaptive/adaptive_list.dart';
+import 'package:vernet/values/keys.dart';
 import 'package:vernet/values/strings.dart';
 
 class DNSPage extends StatefulWidget {
@@ -29,6 +30,7 @@ class _DNSPageState extends BasePage<DNSPage> {
             itemCount: _addresses.length,
             itemBuilder: (context, index) {
               return AdaptiveListTile(
+                key: WidgetKey.dnsResultTile.key,
                 onTap: () {
                   Clipboard.setData(
                     ClipboardData(text: _addresses[index].address),

lib/values/keys.dart

@@ -36,6 +36,7 @@ enum WidgetKey implements Comparable<WidgetKey> {
   lightThemeRadioButton('lightThemeRadioButton'),
   systemThemeRadioButton('systemThemeRadioButton'),
   shortPortChip('shortPortChip'),
+  dnsResultTile('dnsResultTile'),
   fullPortChip('fullPortChip'),
   youtubeChip('youtubeChip'),
   localIpChip('localIpChip'),