@Test
    public void attributeBoolean() {
        xml.openTag("a").attribute(new Utf8String("nalle"), true).closeTag();
        assertEquals("<a nalle=\"true\"/>\n", getWritten());
    }
This test is currently incomplete. Also much tested in the prelude module though.

@author bratseth
vespajlib/src/test/java/com/yahoo/text/XMLWriterTestCase.java