### Question:
ResolveHostnameTransformer implements Transformer { @Override public OutputColumns getOutputColumns() { return new OutputColumns(String.class, hostnameColumn.getName() + " (ip address)"); }  @Override OutputColumns getOutputColumns(); @Override String[] transform(final InputRow inputRow);  }### Answer:
@Test public void testGetOutputColumns() throws Exception { assertEquals("OutputColumns[host (ip address)]", _transformer.getOutputColumns().toString()); }