'Test case id in format like ``s1-t3``.
See :attr:`TestSuite.id <robot.model.testsuite.TestSuite.id>` for
more information.'

@property
def id(self):

    if (not self.parent):
        return 't1'
    return ('%s-t%d' % (self.parent.id, (self.parent.tests.index(self) + 1)))
