How to write Junit Test case for a method

Question

I am very new to Junit testing,Kindly let me know how to mock this method and test in JUNIT:

Answer 1

Hi you can write test classes like this

public class MyTests {    
  @Test
  public void multiplicationOfZeroIntegersShouldReturnZero() {
       MyClass tester = new MyClass(); // MyClass is tested

       // assert statements
       assertEquals(0, tester.multiply(10, 0), "10 x 0 must be 0");
       assertEquals(0, tester.multiply(0, 10), "0 x 10 must be 0");
       assertEquals(0, tester.multiply(0, 0), "0 x 0 must be 0");
  }
}

for more just check this link https://www.vogella.com/tutorials/JUnit/article.html