UpDirectiveTest.java

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package org.xembly;

import com.jcabi.matchers.XhtmlMatchers;
import javax.xml.parsers.DocumentBuilderFactory;
import org.hamcrest.MatcherAssert;
import org.junit.Test;
import org.w3c.dom.Document;

/**
 * Test case for {@link UpDirective}.
 * @author Yegor Bugayenko (yegor256@gmail.com)
 * @version $Id$
 */
public final class UpDirectiveTest {

    /**
     * UpDirective can find parents and move to them.
     * @throws Exception If some problem inside
     */
    @Test
    public void jumpsToParentsWhenTheyExist() throws Exception {
        final Iterable<Directive> dirs = new Directives(
            "ADD 'root'; ADD 'foo'; ADD 'bar'; UP; UP; STRICT '1';"
        );
        final Document dom = DocumentBuilderFactory.newInstance()
            .newDocumentBuilder().newDocument();
        new Xembler(dirs).apply(dom);
        MatcherAssert.assertThat(
            XhtmlMatchers.xhtml(dom),
            XhtmlMatchers.hasXPath("/root/foo/bar")
        );
    }

    /**
     * UpDirective can throw when there are no parents.
     * @throws Exception If some problem inside
     */
    @Test(expected = ImpossibleModificationException.class)
    public void throwsWhenNoParents() throws Exception {
        final Iterable<Directive> dirs = new Directives(
            "ADD 'foo'; UP; UP; UP;"
        );
        final Document dom = DocumentBuilderFactory.newInstance()
            .newDocumentBuilder().newDocument();
        dom.appendChild(dom.createElement("boom"));
        new Xembler(dirs).apply(dom);
    }

}