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