public void Validate_StrContainOpOnly_0Returned()
{
//arrage
ExpressionValidator validator = new ExpressionValidator();
//act
bool result = validator.Check("+");
//assert
Assert.IsFalse(result);
}
public void Validate_1Op2_3Returned()
{
//arrage
ExpressionValidator validator = new ExpressionValidator();
//act
bool result = validator.Check("1+2");
//assert
Assert.IsTrue(result);
}