@TestOnly
  public void unregisterVcs(@NotNull AbstractVcs vcs) {
    if (!ApplicationManager.getApplication().isUnitTestMode() && myMappings.haveActiveVcs(vcs.getName())) {
      // unlikely
      LOG.warn("Active vcs '" + vcs.getName() + "' is being unregistered. Remove from mappings first.");
    }
    myMappings.beingUnregistered(vcs.getName());
    AllVcses.getInstance(myProject).unregisterManually(vcs);
  }
@TestOnly
  public void unregisterVcs(@NotNull AbstractVcs vcs)