Leap year Test

First, the definition of leap year

4 Years a leap, 100 years do not leap, 400 years and leap

Second, demand analysis

The input box is required to enter the year, click the button, a prompt appears. and can handle any input effectively.

Third, test cases

Expected result of content value
Divisible by 400 2400 is a leap year
Divisible by 100 but not divisible by 400 1700 is not a leap year
A leap year, divisible by 4 and not divisible by 100 1964
Not divisible by 4 1931 is not a leap year
Non-numeric character ABC illegal input
Negative number-1234 illegal input
Decimal 2100.5 Illegal input
empty string null illegal input

Iv. Improvement

Using try{}catch{}, and the Parse method

Leap year Test