public static List<SnapshotDescription> assertOneSnapshotThatMatches(Admin admin, byte[] snapshot,
    TableName tableName) throws IOException {
    return assertOneSnapshotThatMatches(admin, Bytes.toString(snapshot), tableName);
  }
Make sure that there is only one snapshot returned from the master and its name and table match
the passed in parameters.
hbase-server/src/test/java/org/apache/hadoop/hbase/snapshot/SnapshotTestingUtils.java