PHPUnit tests pass, but builds are listed as "Testless Build"

class StackTest extends PHPUnit_Framework_TestCase
{
    public function testEmpty()
    {
        $stack = array();
        $this->assertEmpty($stack);
 
        return $stack;
    }
 
    /**
     * @depends testEmpty
     */
    public function testPush(array $stack)
    {
        array_push($stack, 'foo');
        $this->assertEquals('foo', $stack[count($stack)-1]);
        $this->assertNotEmpty($stack);
 
        return $stack;
    }
 
    /**
     * @depends testPush
     */
    public function testPop(array $stack)
    {
        $this->assertEquals('foo', array_pop($stack));
        $this->assertEmpty($stack);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<testsuites>
  <testsuite name="StackTest" file="/Users/akhachatryan/Atlassian/BambooHome3.3.3/xml-data/build-dir/PROJ1-PLAN1-JOB1/test/ExampleTest.php" tests="3" assertions="5" failures="0" errors="0" time="0.007177">
    <testcase name="testEmpty" class="StackTest" file="/Users/akhachatryan/Atlassian/BambooHome3.3.3/xml-data/build-dir/PROJ1-PLAN1-JOB1/test/ExampleTest.php" line="5" assertions="1" time="0.002043"/>
    <testcase name="testPush" class="StackTest" file="/Users/akhachatryan/Atlassian/BambooHome3.3.3/xml-data/build-dir/PROJ1-PLAN1-JOB1/test/ExampleTest.php" line="16" assertions="2" time="0.004539"/>
    <testcase name="testPop" class="StackTest" file="/Users/akhachatryan/Atlassian/BambooHome3.3.3/xml-data/build-dir/PROJ1-PLAN1-JOB1/test/ExampleTest.php" line="28" assertions="2" time="0.000595"/>
  </testsuite>
</testsuites>