flutter unit test basics

group_test.dart

import 'package:flutter_test/flutter_test.dart';

void main() {
  group('This list of numbers', () {
    List numberList = [1, 2, 3, 4, 5];
    test('should have the right length', () {
      expect(numberList.length, equals(5));
    });

    test('should have the correct order', () {
      expect(numberList, orderedEquals([1, 2, 3, 4, 5]));
    });
  });
}

simple_test.dart

import 'package:flutter_test/flutter_test.dart';

void main() {
  test('my first test', () {
    expect(2, equals(2));
  });

  test('item should be in list', () {
    expect([1, 2, 3, 4], contains(2));
  });
}