@Test
    public final void testWriteChar() throws IOException {
        mock.write('\u0020');
        assertEquals(" ", mock.written.toString());
    }
Completeness check for GenericWriter.

@author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
vespajlib/src/test/java/com/yahoo/text/GenericWriterTestCase.java