TestNamedElementChain.java

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.hc.core5.http.config;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.CoreMatchers.is;

import org.hamcrest.CoreMatchers;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link NamedElementChain}.
 */
class TestNamedElementChain {

    @Test
    void testBasics() {
        final NamedElementChain<Character> list = new NamedElementChain<>();
        assertThat(list.getFirst(), CoreMatchers.nullValue());
        assertThat(list.getLast(), CoreMatchers.nullValue());

        final NamedElementChain<Character>.Node nodeA = list.addFirst('a', "a");

        assertThat(list.getFirst(), CoreMatchers.sameInstance(nodeA));
        assertThat(list.getLast(), CoreMatchers.sameInstance(nodeA));

        final NamedElementChain<Character>.Node nodeB = list.addLast('b', "b");

        assertThat(list.getFirst(), CoreMatchers.sameInstance(nodeA));
        assertThat(list.getLast(), CoreMatchers.sameInstance(nodeB));

        final NamedElementChain<Character>.Node nodeZ = list.addLast('z', "z");

        assertThat(list.getFirst(), CoreMatchers.sameInstance(nodeA));
        assertThat(list.getLast(), CoreMatchers.sameInstance(nodeZ));

        assertThat(nodeA.getPrevious(), CoreMatchers.nullValue());
        assertThat(nodeA.getNext(), CoreMatchers.sameInstance(nodeB));
        assertThat(nodeB.getPrevious(), CoreMatchers.sameInstance(nodeA));
        assertThat(nodeB.getNext(), CoreMatchers.sameInstance(nodeZ));
        assertThat(nodeZ.getPrevious(), CoreMatchers.sameInstance(nodeB));
        assertThat(nodeZ.getNext(), CoreMatchers.nullValue());

        final NamedElementChain<Character>.Node nodeD = list.addAfter("b", 'd', "d");
        assertThat(nodeD.getPrevious(), CoreMatchers.sameInstance(nodeB));
        assertThat(nodeD.getNext(), CoreMatchers.sameInstance(nodeZ));
        assertThat(nodeB.getNext(), CoreMatchers.sameInstance(nodeD));
        assertThat(nodeZ.getPrevious(), CoreMatchers.sameInstance(nodeD));

        final NamedElementChain<Character>.Node nodeC = list.addBefore("d", 'c', "c");
        assertThat(nodeC.getPrevious(), CoreMatchers.sameInstance(nodeB));
        assertThat(nodeC.getNext(), CoreMatchers.sameInstance(nodeD));
        assertThat(nodeB.getNext(), CoreMatchers.sameInstance(nodeC));
        assertThat(nodeD.getPrevious(), CoreMatchers.sameInstance(nodeC));
        assertThat(list.getSize(), CoreMatchers.equalTo(5));

        assertThat(list.remove("a"), CoreMatchers.is(true));
        assertThat(list.remove("z"), CoreMatchers.is(true));
        assertThat(list.remove("c"), CoreMatchers.is(true));
        assertThat(list.remove("c"), CoreMatchers.is(false));
        assertThat(list.remove("blah"), CoreMatchers.is(false));

        assertThat(list.getFirst(), CoreMatchers.sameInstance(nodeB));
        assertThat(list.getLast(), CoreMatchers.sameInstance(nodeD));

        assertThat(list.getSize(), CoreMatchers.equalTo(2));
        assertThat(list.addBefore("blah", 'e', "e"), CoreMatchers.nullValue());
        assertThat(list.getSize(), CoreMatchers.equalTo(2));

        assertThat(list.addAfter("yada", 'e', "e"), CoreMatchers.nullValue());
        assertThat(list.getSize(), CoreMatchers.equalTo(2));
    }

    @Test
    void testFind() {
        final NamedElementChain<Character> list = new NamedElementChain<>();
        list.addLast('c', "c");
        assertThat(list.find("c"), notNullValue());
        assertThat(list.find("a"), nullValue());
    }

    @Test
    void testReplace() {
        final NamedElementChain<Character> list = new NamedElementChain<>();
        list.addLast('c', "c");
        final boolean found = list.replace("c",'z' );
        assertThat(found, is(true));
        assertThat(list.find("c").getValue(), equalTo('z'));
        assertThat(list.find("c").getName(), equalTo("c"));
        final boolean notFound = list.replace("X",'z' );
        assertThat(notFound, is(false));

    }
}