TestBasicTokenIterator

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

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.apache.hc.core5.http.Header;
import org.junit.Assert;
import org.junit.Test;


/**
 * Tests for {@link BasicTokenIterator}.
 *
 */
public class TestBasicTokenIterator {

    @Test
    public void testSingleHeader() {
        Header[] headers = new Header[]{
            new BasicHeader("Name", "token0,token1, token2 , token3")
        };
        Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        Iterator<String>  ti  = new BasicTokenIterator(hit);

        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token0", "token0", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token1", "token1", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token2", "token2", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token3", "token3", ti.next());
        Assert.assertFalse(ti.hasNext());


        headers = new Header[]{
            new BasicHeader("Name", "token0")
        };
        hit = new BasicHeaderIterator(headers, null);
        ti  = new BasicTokenIterator(hit);

        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token0", "token0", ti.next());
        Assert.assertFalse(ti.hasNext());
    }


    @Test
    public void testMultiHeader() {
        final Header[] headers = new Header[]{
            new BasicHeader("Name", "token0,token1"),
            new BasicHeader("Name", ""),
            new BasicHeader("Name", "token2"),
            new BasicHeader("Name", " "),
            new BasicHeader("Name", "token3 "),
            new BasicHeader("Name", ","),
            new BasicHeader("Name", "token4"),
        };
        final Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        final Iterator<String>  ti  = new BasicTokenIterator(hit);

        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token0", "token0", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token1", "token1", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token2", "token2", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token3", "token3", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token4", "token4", ti.next());
        Assert.assertFalse(ti.hasNext());
    }


    @Test
    public void testEmpty() {
        final Header[] headers = new Header[]{
            new BasicHeader("Name", " "),
            new BasicHeader("Name", ""),
            new BasicHeader("Name", ","),
            new BasicHeader("Name", " ,, "),
        };
        Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        Iterator<String>  ti  = new BasicTokenIterator(hit);

        Assert.assertFalse(ti.hasNext());


        hit = new BasicHeaderIterator(headers, "empty");
        ti  = new BasicTokenIterator(hit);

        Assert.assertFalse(ti.hasNext());
    }


    @Test
    public void testValueStart() {
        final Header[] headers = new Header[]{
            new BasicHeader("Name", "token0"),
            new BasicHeader("Name", " token1"),
            new BasicHeader("Name", ",token2"),
            new BasicHeader("Name", " ,token3"),
            new BasicHeader("Name", ", token4"),
            new BasicHeader("Name", " , token5"),
        };
        final Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        final Iterator<String>  ti  = new BasicTokenIterator(hit);

        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token0", "token0", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token1", "token1", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token2", "token2", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token3", "token3", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token4", "token4", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token5", "token5", ti.next());
        Assert.assertFalse(ti.hasNext());
    }


    @Test
    public void testValueEnd() {
        final Header[] headers = new Header[]{
            new BasicHeader("Name", "token0"),
            new BasicHeader("Name", "token1 "),
            new BasicHeader("Name", "token2,"),
            new BasicHeader("Name", "token3 ,"),
            new BasicHeader("Name", "token4, "),
            new BasicHeader("Name", "token5 , "),
        };
        final Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        final Iterator<String>  ti  = new BasicTokenIterator(hit);

        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token0", "token0", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token1", "token1", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token2", "token2", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token3", "token3", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token4", "token4", ti.next());
        Assert.assertTrue(ti.hasNext());
        Assert.assertEquals("token5", "token5", ti.next());
        Assert.assertFalse(ti.hasNext());
    }

    @Test
    public void testWrongPublic() {

        try {
            new BasicTokenIterator(null);
            Assert.fail("null argument not detected");
        } catch (final NullPointerException iax) {
            // expected
        }

        final Header[] headers = new Header[]{
            new BasicHeader("Name", " "),
            new BasicHeader("Name", ""),
            new BasicHeader("Name", ","),
            new BasicHeader("Name", " ,, "),
        };
        final Iterator<Header> hit = new BasicHeaderIterator(headers, null);
        final Iterator<String>  ti  = new BasicTokenIterator(hit);

        try {
            // call next() instead of next() to get that covered, too
            ti.next();
            Assert.fail("next after end not detected");
        } catch (final NoSuchElementException nsx) {
            // expected
        }

        try {
            ti.remove();
            Assert.fail("unsupported remove not detected");
        } catch (final UnsupportedOperationException uox) {
            // expected
        }
    }

}