cpd_2022_zi/test/provider/timer_provider_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:smoke_cess_app/providers/timer_provider.dart';

void main() {
  test('Timer should start and set started to true', () {
    final timerProvider = TimerProvider();
    timerProvider.startTimer(const Duration(seconds: 10));
    expect(timerProvider.started, true);
  });

  test('Elapsed time should increase and be less than or equal to the duration',
      () {
    final timerProvider = TimerProvider();
    timerProvider.startTimer(const Duration(seconds: 10));
    final initialElapsedSeconds = timerProvider.elapsedSeconds;
    // Wait for the timer to tick at least once.
    Future.delayed(const Duration(seconds: 2), () {
      expect(timerProvider.elapsedSeconds, greaterThan(initialElapsedSeconds));
      expect(timerProvider.elapsedSeconds, lessThanOrEqualTo(10));
    });
  });

  test('Timer should stop and set started to false', () {
    final timerProvider = TimerProvider();
    timerProvider.startTimer(const Duration(seconds: 10));
    timerProvider.stopTimer();
    expect(timerProvider.started, false);
  });

  test('Elapsed seconds should be 0 when timer is not running', () {
    final timerProvider = TimerProvider();
    expect(timerProvider.elapsedSeconds, 0);
  });

  test('Timer should stop and set started to false when duration is 0', () {
    final timerProvider = TimerProvider();
    timerProvider.startTimer(const Duration(seconds: 0));
    expect(timerProvider.started, false);
  });
}