public static void testBumpSubBuilders() throws Exception {
    File tmp = new File("tmp-ws");
    if (tmp.exists()) IO.deleteWithException(tmp);
    tmp.mkdir();
    assertTrue(tmp.isDirectory());

    try {
      IO.copy(new File("test/ws"), tmp);
      Workspace ws = Workspace.getWorkspace(tmp);
      Project project = ws.getProject("bump-sub");
      project.setTrace(true);

      assertNull(project.getProperty("Bundle-Version"));

      project.bump("=+0");

      assertNull(project.getProperty("Bundle-Version"));

      for (Builder b : project.getSubBuilders()) {
        assertEquals(new Version(1, 1, 0), new Version(b.getVersion()));
      }
    } finally {
      IO.deleteWithException(tmp);
    }
  }
  /** Check if the getSubBuilders properly predicts the output. */
  public static void testSubBuilders() throws Exception {
    Workspace ws = Workspace.getWorkspace(new File("test/ws"));
    Project project = ws.getProject("p4-sub");

    Collection<? extends Builder> bs = project.getSubBuilders();
    assertNotNull(bs);
    assertEquals(3, bs.size());
    Set<String> names = new HashSet<String>();
    for (Builder b : bs) {
      names.add(b.getBsn());
    }
    assertTrue(names.contains("p4-sub.a"));
    assertTrue(names.contains("p4-sub.b"));
    assertTrue(names.contains("p4-sub.c"));

    File[] files = project.build();
    assertTrue(project.check());

    System.err.println(Processor.join(project.getErrors(), "\n"));
    System.err.println(Processor.join(project.getWarnings(), "\n"));
    assertEquals(0, project.getErrors().size());
    assertEquals(0, project.getWarnings().size());
    assertNotNull(files);
    assertEquals(3, files.length);
    for (File file : files) {
      Jar jar = new Jar(file);
      Manifest m = jar.getManifest();
      assertTrue(names.contains(m.getMainAttributes().getValue("Bundle-SymbolicName")));
    }
  }