doormile_milderapp/test/text_scale_sweep_test.dart

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,
        );
      });
    }
  });
}