public void IsItNegative_ZeroPassed_ThrowsException()
        {
            Exception exception = null;

            try
            {
                IsNegative.IsItNegative(0);
            }
            catch (Exception ex)
            {
                exception = ex;
            }
            Assert.IsNotNull(exception);
        }
 public void IsItNegative_NegativeNumberPassed_ReturnsTrue()
 {
     Assert.IsTrue(IsNegative.IsItNegative(-5));
 }
 public void IsItNegative_PositveNumberPassed_ReturnsFalse()
 {
     Assert.IsFalse(IsNegative.IsItNegative(5));
 }