JUnit - How to test a method with different values?

Question

I have a method and wish to test it with different values. My question is: how can I write a JUnit test that would test the same method with different values?

Answer 1

You can take a look at parametrized tests like in example.

You can also use theories which is more convenient in a lot of cases.

Answer 2

JUnit4 supports parameterized tests for just this purpose.

See this tutorial.

Answer 3

I suggest you create a different unit test for each one of your (overloaded) function definitions, because arguably you are testing in fact different functions. For instance:

class MainClass {
public void method( int param) {... }
public void method( String param) { ...}
}

class MainClassTest {
@Test
public void methodIntTest() {
 //call method(int)
}

@Test
public void methodStringTest() {
 //call method(String)
}
}