I played around a bit with iteration using JUnit today. I have some generic tests that behave differently depending on the values fed to them. I don’t want to have iteration code living alongside each test (maintenance nightmare), so I wanted to use JUnit’s @Parameters tag to pull in my test data via a Preferences file and do the iteration for me.
It took me longer than I expected to get right, mostly because static methods annoy me and trip me up a bit. (Your parameters method must be static in order for it to work).
However, get it working I did. On the off chance that it saves someone else some time, here’s how it works:
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Properties;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
@RunWith(Parameterized.class)
public class paramTest
{
final static String dataFile = "/dataDriver.txt";
private String words;
public paramTest(String words)
{
this.words = words;
}
@Test
public void verifyThing() throws Exception
{
System.out.println("key: " + words);
}
@Parameters
public static Collection data()
{
Collection returnList = new ArrayList
Interestingly enough, the data comes back in the reverse order that it exists in the preferences file. Something to keep in mind if you want your tests to run in a certain order.
July 12th, 2010 at 9:01 pm
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