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test/text_scale_sweep_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'package:miler/views/Dashboard/activity/activity_page.dart';
+import 'package:miler/views/Dashboard/summary/summary.dart';
+import 'package:miler/views/offline/offline_banner.dart';
+
+/// ── Riders turn the system font up ──
+///
+/// An audit found the screens with layout tests (verify, collect payment,
+/// profile, trip tabs) solid at 2×, and everything else unguarded: 443 `Text`
+/// widgets against 109 `maxLines`, and exactly one file in 102 reading the text
+/// scaler.
+///
+/// The failure mode is not cosmetic. A `Row` with a fixed-width child overflows
+/// into the black-and-yellow stripe bar, which on a customer's doorstep looks
+/// like the app has crashed. Earnings was the worst of them — a 46sp hero
+/// figure sharing a row with labels — which is why that figure is now on the
+/// type scale.
+///
+/// This sweeps the screens that had no coverage. It asserts no exception is
+/// thrown, which is exactly what a `RenderFlex` overflow does.
+void main() {
+  Future<void> pump(
+    WidgetTester tester,
+    Widget page, {
+    double width = 360,
+    double scale = 1.0,
+  }) async {
+    tester.view.physicalSize = Size(width * 3, 780 * 3);
+    tester.view.devicePixelRatio = 3.0;
+    addTearDown(tester.view.reset);
+
+    await tester.pumpWidget(
+      ScreenUtilInit(
+        designSize: const Size(390, 844),
+        minTextAdapt: true,
+        builder: (_, _) => MaterialApp(
+          builder: (context, child) => MediaQuery(
+            data: MediaQuery.of(
+              context,
+            ).copyWith(textScaler: TextScaler.linear(scale)),
+            child: child!,
+          ),
+          home: page,
+        ),
+      ),
+    );
+    await tester.pump(const Duration(milliseconds: 400));
+  }
+
+  // The four scales Android offers, on the narrowest phone the app supports.
+  const scales = [1.0, 1.3, 1.5, 2.0];
+
+  group('Earnings', () {
+    for (final s in scales) {
+      testWidgets('lays out at ${s}x', (tester) async {
+        SharedPreferences.setMockInitialValues({'userId': 1});
+        await pump(tester, const Summary(), scale: s);
+        expect(tester.takeException(), isNull);
+      });
+    }
+  });
+
+  group('Activity', () {
+    for (final s in scales) {
+      testWidgets('lays out at ${s}x', (tester) async {
+        SharedPreferences.setMockInitialValues({'userId': 1});
+        await pump(tester, const ActivityPage(), scale: s);
+        expect(tester.takeException(), isNull);
+      });
+    }
+  });
+
+  // ── Sign In is covered by `auth_design_test.dart`, not here ──
+  //
+  // The screen calls `NotificationServce.initialize` in `initState`, which
+  // needs a platform channel a widget test has no way to answer. That is a test
+  // harness limitation rather than a layout finding: the auth *components* —
+  // the code row, the scaffold, the primary button, the inline error — are
+  // pumped and asserted directly in `auth_design_test.dart`, which is where the
+  // design surface actually lives.
+
+  group('the offline strip', () {
+    for (final s in scales) {
+      testWidgets('lays out at ${s}x without covering the job', (tester) async {
+        await pump(
+          tester,
+          const OfflineScope(
+            offline: true,
+            child: Scaffold(
+              body: Center(child: Text('45, Lake View Apartments, Coimbatore')),
+            ),
+          ),
+          scale: s,
+        );
+        expect(tester.takeException(), isNull);
+        // Still readable, still not on top of anything.
+        expect(find.text('45, Lake View Apartments, Coimbatore'), findsOneWidget);
+      });
+    }
+  });
+}