    @Test
    public void determineCheckoutPath_relativeOnNix() {

        final VirtualChannel vc = mock(VirtualChannel.class);
        final String nixPath = "/opt/.jenkins/jobs/tfs-plugin/workspace";
        final FilePath workspacePath = new FilePath(vc, nixPath);

        final String actual = CheckoutAction.determineCheckoutPath(workspacePath, "../files");

        Assert.assertEquals("/opt/.jenkins/jobs/tfs-plugin/files", actual);
    }