public void MethodCount()
        {
            // Arrange
            var database = new _1.Database.Models.Database(1, 2, 3);

            // Act
            database.Add(1);
            database.Remove();
            database.Add(3);

            // Assert
            Assert.AreEqual(4, database.Count());
        }
        public void AddMethodTest()
        {
            // Arrange
            var database = new _1.Database.Models.Database(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);

            // Assert
            Assert.Throws <InvalidOperationException>(() => database.Add(30));
        }
        public void AddMethodShouldAddOneElement()
        {
            // Arrange
            var database = new _1.Database.Models.Database(1);

            // Act
            database.Add(1);

            // Assert
            Assert.AreEqual(2, database.Count());
        }