### Question:
AbstractSideBySideDiffPresentation extends AbstractDiffPresentation { public void setIoutils(IOUtilities ioutils) { Utilities.checkNull("setIoutils", "ioutils", ioutils); this.ioutils = ioutils; }  @Override void execute(); void setFileWrapperFactory(FileWrapperFactory fileWrapperFactory); void setIoutils(IOUtilities ioutils); void setDialectFactory(IDialectFactory dialectFactory);  }### Answer:
@Test(expected = IllegalArgumentException.class) public void testSetIoutils() { classUnderTest.setIoutils(null); }