public void PhoneNoMid()
{
//create an instance of the class we want to create
clsStaff AStaff = new clsStaff();
//boolean variable to store the result of the validation
Boolean PhoneNoOK = false;
//create some test data to assign the property
string SomePhoneNo = "1234567";
//invoke the method
PhoneNoOK = AStaff.PhoneNoValid(SomePhoneNo);
//test to see if the result is correct
Assert.IsTrue(PhoneNoOK);
}