Question

I used to write JUnit tests as methods, such as:

public class TextualEntailerTest {
  @Test test1() {...}
  @Test test2() {...}
  @Test test3() {...}
}

Since most of the test cases has a similar structure, I decided to be “data-driven”, and put the contents of the tests in XML files. So, I created a method “testFromFile(file)” and changed my test to:

public class TextualEntailerTest {
  @Test test1() { testFromFile("test1.xml"); }
  @Test test2() { testFromFile("test2.xml"); }
  @Test test3() { testFromFile("test3.xml"); }
}

As I add more and more tests, I become tired of adding a line for each new test file I add. Of course I can put all files in a single test:

public class TextualEntailerTest {
  @Test testAll() { 
     foreach (String file: filesInFolder) 
       testFromFile(file); 
  }
}

However, I prefer that each file will be a separate test, because this way JUnit gives nice statistics about the number of files passed and failed.

So, my question is: how to tell JUnit to run separate tests, where each test is of the form “testFromFile(file)”, for all files in a given folder?

Answer 1

@RunWith(value = Parameterized.class)
public class JunitTest {

     private String filename;

     public JunitTest(String filename) {
        this.filename= filename;
     }

     @Parameters
     public static Collection<Object[]> data() {
       Object[][] data = new Object[][] { { "file1.xml" }, { "file2.xml" } };
       return Arrays.asList(data);
     }

     @Test
     public void Test() {
       System.out.println("Test name:" + filename);
     }


}