public String findLeastFullRepository(Map<String, PlatformUtil.DF> repoMap) {
   String mostFree = null;
   for (String repo : repoMap.keySet()) {
     PlatformUtil.DF df = repoMap.get(repo);
     if (df != null) {
       if (mostFree == null || (repoMap.get(mostFree)).getAvail() < df.getAvail()) {
         mostFree = repo;
       }
     }
   }
   return mostFree;
 }
  public void testConfig() throws Exception {
    MyMockLockssRepositoryImpl repo1 = makeRepo("foo");
    assertEquals(RepositoryManager.DEFAULT_MAX_PER_AU_CACHE_SIZE, repo1.nodeCacheSize);

    ConfigurationUtil.setFromArgs(RepositoryManager.PARAM_MAX_PER_AU_CACHE_SIZE, "4");
    MyMockLockssRepositoryImpl repo2 = makeRepo("bar");
    assertEquals(4, repo1.nodeCacheSize);
    assertEquals(4, repo2.nodeCacheSize);

    repo1.cnt = 0;
    ConfigurationUtil.setFromArgs(RepositoryManager.PARAM_MAX_PER_AU_CACHE_SIZE, "37");
    assertEquals(37, repo1.nodeCacheSize);
    assertEquals(37, repo2.nodeCacheSize);
    assertEquals(1, repo1.cnt);
    // ensure setNodeCacheSize doesn't get called if param doesn't change
    ConfigurationUtil.setFromArgs(
        RepositoryManager.PARAM_MAX_PER_AU_CACHE_SIZE, "37", "org.lockss.somethingElse", "bar");
    assertEquals(1, repo1.cnt);

    PlatformUtil.DF warn = mgr.getDiskWarnThreshold();
    PlatformUtil.DF full = mgr.getDiskFullThreshold();
    assertEquals(5000 * 1024, warn.getAvail());
    assertEquals(0.98, warn.getPercent(), .00001);
    assertEquals(100 * 1024, full.getAvail());
    assertEquals(0.99, full.getPercent(), .00001);

    Properties p = new Properties();
    p.put(RepositoryManager.PARAM_DISK_WARN_FRRE_MB, "17");
    p.put(RepositoryManager.PARAM_DISK_WARN_FRRE_PERCENT, "20");
    p.put(RepositoryManager.PARAM_DISK_FULL_FRRE_MB, "7");
    p.put(RepositoryManager.PARAM_DISK_FULL_FRRE_PERCENT, "10");
    ConfigurationUtil.setCurrentConfigFromProps(p);
    warn = mgr.getDiskWarnThreshold();
    full = mgr.getDiskFullThreshold();
    assertEquals(17 * 1024, warn.getAvail());
    assertEquals(0.80, warn.getPercent(), .00001);
    assertEquals(7 * 1024, full.getAvail());
    assertEquals(0.90, full.getPercent(), .00001);
  }