SplashScreen codes, one that is not working and another that's works.

app_test.dart

import 'dart:io';
import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';

void main() {
  group('Testing app', () {
    FlutterDriver driver;

    // Connect to the Flutter driver before running any tests.
    setUpAll(() async {
      driver = await FlutterDriver.connect();
    });

    // Close the connection to the driver after the tests have completed.
    tearDownAll(() async {
      if (driver != null) {
        driver.close();
      }
    });

    Future<void> tap(SerializableFinder finder) async {
      await driver.waitFor(finder);
      await driver.tap(finder);
    }

    // This test is working
    test('Check flutter driver health', () async {
      Health health = await driver.checkHealth();
      expect(health.status, HealthStatus.ok);
    });

    // This test is working
    test('Test onboarding', () async {
      await tap(find.text("Skip"));
      await tap(find.text("Done"));
    });

    // This test is not working if there is the Align widget
    test('Test splashscreen', () async {
      await driver.waitFor(find.text("Loading"));
    });

    // This test is not working, but I think it's same issue as the splashscreen
    test('Click on site ESCP Europe - République', () async {
      await Future.delayed(const Duration(seconds: 10));
      await tap(find.text("ESCP Europe - République"));
    });

    // This test is working
    test('Test to like multiple times a site', () async {
      for (var i = 0; i < 100; i++) {
        await tap(find.byType("FavButton"));
        await Future.delayed(Duration(milliseconds: 300));
      }
    });

    // This test is working
    test('Test booking', () async {
      await tap(find.text("Book"));
      await tap(find.text("Group study rooms"));
      await tap(find.byValueKey("bookRes750"));
      await tap(find.byValueKey("booking_email"));

      await driver.enterText("jeancharles.msse@gmail.com");
    });
  });
}

Splashscreen_notworking.dart

@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        alignment: Alignment.center,
        children: [
          SplashScreenLogo(),
          SafeArea(
            child: Padding(
              padding: const EdgeInsets.all(20.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  FutureBuilder<PackageInfo>(
                    future: PackageInfo.fromPlatform(),
                    builder: (context, snap) {
                      if (!snap.hasData) return Text("");
                      return Text(
                        '${snap.data.version} (${snap.data.buildNumber})',
                        textAlign: TextAlign.end,
                        style: const TextStyle(color: Colors.black26),
                      );
                    },
                  ),
                  const Expanded(child: SizedBox.shrink()),
                  Text(
                    "Loading",
                    textAlign: TextAlign.center,
                    style: const TextStyle(fontSize: 18.0),
                  ),
                  const SizedBox(height: 24.0),
                  _isLoading
                      ? const SizedBox.shrink()
                      : Center(child: RetryButton(onPress: _initAllData)),
                ],
              ),
            ),
          ),
          Align(
            alignment: Alignment.bottomCenter,
            child: LinearProgressIndicator(value: _isLoading ? null : 0),
          ),
        ],
      ),
    );
  }

Splashscreen_working.dart

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        alignment: Alignment.center,
        children: [
          SplashScreenLogo(),
          SafeArea(
            child: Padding(
              padding: const EdgeInsets.all(20.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  FutureBuilder<PackageInfo>(
                    future: PackageInfo.fromPlatform(),
                    builder: (context, snap) {
                      if (!snap.hasData) return Text("");
                      return Text(
                        '${snap.data.version} (${snap.data.buildNumber})',
                        textAlign: TextAlign.end,
                        style: const TextStyle(color: Colors.black26),
                      );
                    },
                  ),
                  const Expanded(child: SizedBox.shrink()),
                  Text(
                   "Loading",
                    textAlign: TextAlign.center,
                    style: const TextStyle(fontSize: 18.0),
                  ),
                  const SizedBox(height: 24.0),
                  _isLoading
                      ? const SizedBox.shrink()
                      : Center(child: RetryButton(onPress: _initAllData)),
                ],
              ),
            ),
          ),
          /*
          If Align widget is remove, or LinearProgressIndicator is replaced by a Container, it's working
          Align(
            alignment: Alignment.bottomCenter,
            child: Container(height: 20.0, color: Colors.red),
          ),
          */
        ],
      ),
    );
  }