A whole lot of stuff

test/faq_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:fuel_tax_tracker/screens/faq_screen.dart';
+
+/// Covers [FaqScreen] itself (question list, collapsed-by-default,
+/// deep-linking a specific entry open) and [FaqActionButton], the shared
+/// "?" AppBar action reused across every tab — see settings_screen_test.dart
+/// for the Settings landing page's own FAQ entry, and
+/// backup_reminder_test.dart for the "Learn More" link into a specific
+/// entry.
+void main() {
+  testWidgets('every question starts collapsed with no initiallyExpandedQuestion given',
+      (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));
+
+    expect(find.text('What is the Missouri Motor Fuel Tax Refund?'), findsOneWidget);
+    expect(find.textContaining('12.5¢ per gallon'), findsNothing);
+  });
+
+  testWidgets('groups questions under section headers', (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));
+
+    // The first section header is visible without scrolling; the last
+    // one only reachable by scrolling all the way down — checking both
+    // confirms headers span the whole list, not just its start.
+    expect(find.text('Missouri Motor Fuel Tax Refund'), findsOneWidget);
+
+    await tester.scrollUntilVisible(find.text('Advertisements'), 300,
+        scrollable: find.byType(Scrollable));
+    expect(find.text('Advertisements'), findsOneWidget);
+  });
+
+  testWidgets('tapping a question expands its answer', (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));
+
+    await tester.scrollUntilVisible(find.text('How do I remove ads?'), 300,
+        scrollable: find.byType(Scrollable));
+    // scrollUntilVisible stops as soon as any part is on-screen, which can
+    // leave it right at the bottom edge — nudge further so its center
+    // (what tap() targets) is comfortably inside the viewport.
+    await tester.drag(find.byType(Scrollable), const Offset(0, -100));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('How do I remove ads?'));
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining("doesn't auto-renew"), findsOneWidget);
+  });
+
+  testWidgets('includes a contact email for problem receipts/VINs/errors', (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));
+
+    await tester.scrollUntilVisible(
+        find.text("Found a receipt, VIN, or error the app couldn't handle?"), 300,
+        scrollable: find.byType(Scrollable));
+    await tester.tap(find.text("Found a receipt, VIN, or error the app couldn't handle?"));
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining('ohbrer+ShowMeTheFuelRefund@gmail.com'), findsOneWidget);
+  });
+
+  testWidgets('the refund program question covers both highway and non-highway refunds',
+      (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));
+
+    await tester.tap(find.text('What is the Missouri Motor Fuel Tax Refund?'));
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining('Highway use — up to 12.5¢ per gallon'), findsOneWidget);
+    expect(find.textContaining('Non-highway use — up to 29.5¢ per gallon'), findsOneWidget);
+    expect(find.textContaining("isn't tax advice"), findsOneWidget);
+    expect(find.textContaining('consult a tax professional'), findsOneWidget);
+  });
+
+  testWidgets('initiallyExpandedQuestion starts that one entry open, others collapsed',
+      (tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(home: FaqScreen(initiallyExpandedQuestion: 'Is my data backed up?')),
+    );
+    await tester.pumpAndSettle();
+
+    // Its section (Data Safety) is further down the page now that
+    // questions are grouped — scroll to it before checking its content.
+    await tester.scrollUntilVisible(find.text('Is my data backed up?'), 300,
+        scrollable: find.byType(Scrollable));
+
+    expect(find.textContaining('Not by default'), findsOneWidget);
+    expect(find.textContaining('12.5¢ per gallon'), findsNothing,
+        reason: 'only the targeted question starts expanded');
+  });
+
+  testWidgets('FaqActionButton pushes FaqScreen', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(appBar: AppBar(actions: const [FaqActionButton()])),
+      ),
+    );
+
+    await tester.tap(find.byIcon(Icons.help_outline));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(FaqScreen), findsOneWidget);
+  });
+}