Abstract Unit test for a @controller with MultipartHttpServletRequest

AbstractMockitoMultipartHttpServletRequestUnitTest.java

import static org.mockito.Mockito.*;

/**
 * Boostraps a MultipartHttpServletRequest using mockito.
 * To add a request parameter, define a method called 'parameterName', where request attribute is 'name'.
 * To add a multipart file, define a method called 'fileName', where the multipart file is called 'name'.
 * Class is very limited but works as it should providing you use a specific subset of the methods on {@link MultipartHttpServletRequest}.
 * Subset: 
 * 	MultipartHttpServletRequest.getParameter
 * 	MultipartHttpServletRequest.getFileMap
 *      Map.*
 *      MultipartFile.getInputStream
 */
public abstract class AbstractMockitoMultipartHttpServletRequestUnitTest {

	protected MultipartHttpServletRequest request;
	
	Logger log = Logger.getLogger(AbstractMockitoMultipartHttpServletRequestUnitTest.class);
	
	public MultipartHttpServletRequest getRequest() {
		return request;
	}
	
	protected String beanName(String name,String prefix)
	{
		return name.substring(prefix.length()).substring(0,1).toLowerCase() +
				name.substring(prefix.length()+1);
	}
	
	@Before
	public void setupTest() throws Exception
	{
		request = mock(MultipartHttpServletRequest.class);
		Map<String,MultipartFile> fileMap = new HashMap<String, MultipartFile>();
		when(request.getFileMap()).thenReturn(fileMap);
		
		for(Method m : this.getClass().getMethods())
		{
			if(m.getName().startsWith("parameter"))
			{				
				String ret = (String) m.invoke(this);
				String name = beanName(m.getName(),"parameter");
				log.debug("found parameter " + name + " == " + ret);
				when(request.getParameter(name)).thenReturn(ret);
			}
			if(m.getName().startsWith("file"))
			{				
				String name = beanName(m.getName(),"file");
				log.debug("found file " + name);
				MultipartFile file = mock(MultipartFile.class);
				when(file.getInputStream()).thenReturn((InputStream) m.invoke(this));				
				fileMap.put(name,file);
			}
		}
	}
}