### Question:
LenskitInfo { @Nonnull public static synchronized Set<String> getRevisions() { Set<String> revisions = revisionSet == null ? null : revisionSet.get(); if (revisions == null) { revisions = loadRevisionSet(); revisionSet = new SoftReference<>(revisions); } return revisions; } private  LenskitInfo(); @Nonnull static synchronized Set<String> getRevisions(); static boolean includesRevision(String revision); @Nonnull static String getHeadRevision(); @Nonnull static String lenskitVersion();  }### Answer:
@Test public void testGetRevisions() throws Exception { assertThat(LenskitInfo.getRevisions(), hasItem("9103068a95fc650f9f4670683308819366e9d03b")); }