* @throws Exception
     */
    @Test
    public void testSubstringFromLast() throws Exception {
        assertEquals("ab", StringUtil.substringFromLast("abc", "c"));
        assertEquals("abcab", StringUtil.substringFromLast("abcabc", "c"));
        assertEquals("abc", StringUtil.substringFromLast("abc", ""));
        assertEquals("abc", StringUtil.substringFromLast("abc", null));

    CharSource source = CharSource.wrap("abcd");
    Iterable<CharSource> cycle = Iterables.cycle(ImmutableList.of(source));
    CharSource concatenated = CharSource.concat(cycle);

    String expected = "abcdabcd";

    // read the first 8 chars manually, since there's no equivalent to ByteSource.slice
    // TODO(cgdecker): Add CharSource.slice?
    StringBuilder builder = new StringBuilder();

    CharSource source = CharSource.wrap("abcd");
    Iterable<CharSource> cycle = Iterables.cycle(ImmutableList.of(source));
    CharSource concatenated = CharSource.concat(cycle);

    String expected = "abcdabcd";

    // read the first 8 chars manually, since there's no equivalent to ByteSource.slice
    // TODO(cgdecker): Add CharSource.slice?
    StringBuilder builder = new StringBuilder();

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WAAa,WAEtB,OADAnE,EAAAA,QAAEC,GAAF,OAAaF,GACNmP,GAAOzL,kBC1bhB,IACM3D,GAAW,aACXC,GAAqBC,EAAAA,QAAEC,GAAF,OAErB+G,GAAkB,eAClB0M,GAAwB,gBACxBC,GAAmB,yBAInB1M,GAAkB,eAOlB2M,GAA6B,kBAM7BxT,GAAU,CACdmH,eAAgB,iBAChBC,kBAAmB,IACnBqM,iBAAiB,EACjBC,oBAAqB,aACrBC,gBAAiB,IACjBC,yBAAyB,GAQrBC,GAAAA,WACJ,SAAAA,EAAYzS,EAASkC,GACnBhC,KAAKiG,QAAUjE,EACfhC,KAAKC,SAAWH,6BAKlB0S,gBAAA,SAAgBC,QAAc,IAAdA,IAAAA,EAAQ,MACtB,IAAMvM,EAAQ5H,EAAAA,QAAE,QACZoU,EAAiB,GAEjBxM,EAAM1F,SA9BgC,+BA8BmB0F,EAAM1F,SA7B/B,yBA6BsF,oBAA...

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        "thai_keywords": {
          "type":       "keyword_marker",
          "keywords": ["สวัสดี", "โลก", "ค้นหา"]
        },
        "turkish_stop": {
          "type":       "stop",

## Changelog since v1.8.0-beta.1

### Action Required

* New GCE or GKE clusters created with `cluster/kube-up.sh` will not enable the legacy ABAC authorizer by default. If you would like to enable the legacy ABAC authorizer, export ENABLE_LEGACY_ABAC=true before running `cluster/kube-up.sh`. ([#51367](https://github.com/kubernetes/kubernetes/pull/51367), [@cjcullen](https://github.com/cjcullen))