### Question:
ReleaseVersion implements Comparable<ReleaseVersion> { public static ReleaseVersion fromStringSafely(String versionString, ReleaseVersion defaultVersion) { try { return new Builder().fromString(versionString, true).build(); } catch (Exception e) { return defaultVersion; } } private  ReleaseVersion(short majorVersion, int minorVersion, int patchVersion, int buildNumber, MatchPrecision matchPrecision); MatchPrecision getMatchPrecision(); @Override String toString(); @Override int compareTo(ReleaseVersion other); @Override boolean equals(final Object o); static ReleaseVersion fromString(String versionString); static ReleaseVersion fromStringSafely(String versionString, ReleaseVersion defaultVersion); static Builder newBuilder(); static final int MAX_MAJOR_VERSION; static final int MAX_MINOR_VERSION; static final int MAX_PATCH_VERSION; static final int MAX_BUILD_NUMBER; }### Answer:
@Test public void testFromStringSafely() { final ReleaseVersion expectedVersion = ReleaseVersion.fromString("1.0.0.0"); assertEquals(expectedVersion, ReleaseVersion.fromStringSafely("1.0.rc1", null)); assertEquals(expectedVersion, ReleaseVersion.fromStringSafely("1.-206.x", null)); assertEquals(expectedVersion, ReleaseVersion.fromStringSafely("1.0.0.65536", null)); final ReleaseVersion defaultVersion = ReleaseVersion.newBuilder().build(); assertEquals(defaultVersion, ReleaseVersion.fromStringSafely("32768.x", defaultVersion)); assertEquals(defaultVersion, ReleaseVersion.fromStringSafely("x", defaultVersion)); assertEquals(defaultVersion, ReleaseVersion.fromStringSafely("", defaultVersion)); }