Question

I have a test case that looks like so:

public class MyTest {

    private static TestObject obj;

    @BeforeClass
    public static void setUpBeforeClass() {
        obj = new TestObject();
    }

    @Test
    public void testOne() {
        assertTrue(obj.hasFoo());
    }

    @Test
    public void testTwo() {
        assertEquals(42, obj.getBar());
    }

    // More tests here...

}

What I want to do now is running the whole test case with different instances of TestObject. So let’s say I have 10 different TestObject instances. Now I want to run testOne() testTwo() and so on 10 times (with every instance of TestObject I need).

How can I achieve this with JUnit4? Or is my design bad? Any ideas for a better one?

Answer 1

Use parameterized test:

@RunWith(Parameterized.class)
public class MyTest {
    public MyTest(TestObject obj) {
        this.obj = obj;
    }

    @Parameters
    public static Collection<TestObject> params() { ... }

    ...
}