### Question:
VersionChecker { public static VersionCheckResult checkVersion(String localVersion) { String remoteVersion = getVersion(); if (remoteVersion == null || remoteVersion.isEmpty()) { return VersionCheckResult.error(); } Integer[] iLocalVersion = parseVersion(localVersion); Integer[] iRemoteVersion = parseVersion(remoteVersion); int local, remote; for (int i = 0; i < Math.max(iLocalVersion.length, iRemoteVersion.length); i++) { local = i < iLocalVersion.length ? iLocalVersion[i] : -1; remote = i < iRemoteVersion.length ? iRemoteVersion[i] : -1; if (local < remote) { return VersionCheckResult.old(localVersion, remoteVersion); } else if (local > remote) { return VersionCheckResult.unknown(localVersion); } } return VersionCheckResult.latest(); }  static String getVersion(); static VersionCheckResult checkVersion(String localVersion);  }### Answer:
@Test public void testCheckVersion() { String version = VersionChecker.getVersion(); assertNotNull("Version string is null", version); }