Test Selector Plugin Jenkins returns No tests were executed

Question

I am trying to run a simple test with the Tests Selector Plugin for Jenkins. I followed the tutorial in the wiki.

When I am going to build, I get this tree (which looks ok)

My config file is this one:

tests=[{"enabled":true,"owner":"saul","testgroup":"A","testcase":"NewTest.testJenkinsWebsite"},{"enabled":true,"owner":"saul","testgroup":"B","testcase":"NewTest.testJenkinsWebsiteAgain"}]
enableField=enabled
groupBy=testgroup
fieldSeparator=.
showFields=testsuite,testcase
multiplicityField=multiplicity

And my test class is this:

public class NewTest {
    private WebDriver driver;
    private String baseUrl;
    private boolean acceptNextAlert = true;
    private StringBuffer verificationErrors = new StringBuffer();

    @Before
    public void setUp() throws Exception {
        // Usual Code here
    }

    @Test
    public void testJenkinsWebsite() throws Exception {
        // Some test here
    }

    @Test
    public void testJenkinsWebsiteAgain() throws Exception {
        // Other test here
    }

    @After
    public void tearDown() throws Exception {
        driver.quit();
        String verificationErrorString = verificationErrors.toString();
        if (!"".equals(verificationErrorString)) {
            fail(verificationErrorString);
        }
    }
}

However, when I press "Build" I get the following error:

[JENKINS] Recording test results
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.858s
[INFO] Finished at: Mon Jun 08 17:44:27 UTC 2015
[INFO] Final Memory: 17M/41M
[INFO] ------------------------------------------------------------------------
Waiting for Jenkins to finish collecting data
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.10:test (default-test) on project SampleSeleniumGrid: No tests were executed!  (Set -DfailIfNoTests=false to ignore this error.) -> [Help 1]

What am I doing wrong?