StringsTests.java example

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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.common;

import org.elasticsearch.common.util.set.Sets;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.ToXContentObject;
import org.elasticsearch.test.ESTestCase;

import static org.hamcrest.Matchers.containsString;

public class StringsTests extends ESTestCase {

    public void testSubstring() {
        assertEquals(null, Strings.substring(null, 0, 1000));
        assertEquals("foo", Strings.substring("foo", 0, 1000));
        assertEquals("foo", Strings.substring("foo", 0, 3));
        assertEquals("oo", Strings.substring("foo", 1, 3));
        assertEquals("oo", Strings.substring("foo", 1, 100));
        assertEquals("f", Strings.substring("foo", 0, 1));
    }

    public void testCleanTruncate() {
        assertEquals(null, Strings.cleanTruncate(null, 10));
        assertEquals("foo", Strings.cleanTruncate("foo", 10));
        assertEquals("foo", Strings.cleanTruncate("foo", 3));
        // Throws out high surrogates
        assertEquals("foo", Strings.cleanTruncate("foo\uD83D\uDEAB", 4));
        // But will keep the whole character
        assertEquals("foo\uD83D\uDEAB", Strings.cleanTruncate("foo\uD83D\uDEAB", 5));
        /*
         * Doesn't take care around combining marks. This example has its
         * meaning changed because that last codepoint is supposed to combine
         * backwards into the find "o" and be represented as the "o" with a
         * circle around it with a slash through it. As in "no 'o's allowed
         * here.
         */
        assertEquals("o", Strings.cleanTruncate("o\uD83D\uDEAB", 1));
        assertEquals("", Strings.cleanTruncate("foo", 0));
    }

    public void testToStringToXContent() {
        final ToXContent toXContent;
        final boolean error;
        if (randomBoolean()) {
            if (randomBoolean()) {
                error = false;
                toXContent  = (builder, params) -> builder.field("ok", "here").field("catastrophe", "");
            } else {
                error = true;
                toXContent  = (builder, params) ->
                        builder.startObject().field("ok", "here").field("catastrophe", "").endObject();
            }
        } else {
            if (randomBoolean()) {
                error = false;
                toXContent = (ToXContentObject) (builder, params) ->
                        builder.startObject().field("ok", "here").field("catastrophe", "").endObject();
            } else {
                error = true;
                toXContent = (ToXContentObject) (builder, params) -> builder.field("ok", "here").field("catastrophe", "");
            }
        }

        String toString = Strings.toString(toXContent);
        if (error) {
            assertThat(toString, containsString("Error building toString out of XContent"));
        } else {
            assertThat(toString, containsString("\"ok\":\"here\""));
            assertThat(toString, containsString("\"catastrophe\":\"\""));
        }
    }

    public void testSplitStringToSet() {
        assertEquals(Strings.splitStringByCommaToSet(null), Sets.newHashSet());
        assertEquals(Strings.splitStringByCommaToSet(""), Sets.newHashSet());
        assertEquals(Strings.splitStringByCommaToSet("a,b,c"), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringByCommaToSet("a, b, c"), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringByCommaToSet(" a ,  b, c  "), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringByCommaToSet("aa, bb, cc"), Sets.newHashSet("aa","bb","cc"));
        assertEquals(Strings.splitStringByCommaToSet(" a "), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringByCommaToSet("   a   "), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringByCommaToSet("   aa   "), Sets.newHashSet("aa"));
        assertEquals(Strings.splitStringByCommaToSet("   "), Sets.newHashSet());

        assertEquals(Strings.splitStringToSet(null, ' '), Sets.newHashSet());
        assertEquals(Strings.splitStringToSet("", ' '), Sets.newHashSet());
        assertEquals(Strings.splitStringToSet("a b c", ' '), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringToSet("a, b, c", ' '), Sets.newHashSet("a,","b,","c"));
        assertEquals(Strings.splitStringToSet(" a   b c  ", ' '), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringToSet("  a   b   c  ", ' '), Sets.newHashSet("a","b","c"));
        assertEquals(Strings.splitStringToSet("aa bb cc", ' '), Sets.newHashSet("aa","bb","cc"));
        assertEquals(Strings.splitStringToSet(" a ", ' '), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringToSet("    a    ", ' '), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringToSet(" a   ", ' '), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringToSet("a   ", ' '), Sets.newHashSet("a"));
        assertEquals(Strings.splitStringToSet("   aa   ", ' '), Sets.newHashSet("aa"));
        assertEquals(Strings.splitStringToSet("aa   ", ' '), Sets.newHashSet("aa"));
        assertEquals(Strings.splitStringToSet("   ", ' '), Sets.newHashSet());
    }
}