Question

I am trying to write some gwt testcases to upload files using FileUpload and FormPanel.

My code (unttested) looks like:

@Test
public void testImportXml() {
    delayTestFinish(10000);
    FormPanel fileForm=new FormPanel();
    fileForm.setEncoding(FormPanel.ENCODING_MULTIPART);
    fileForm.setMethod(FormPanel.METHOD_POST);
    fileForm.setAction(GWT.getModuleBaseURL()+"/xmlupload");
    URL myFile=this.getClass().getClassLoader().getResource("myfile.xml");
    // FileUpload uploadField; ??

    fileForm.addSubmitHandler(new SubmitHandler() {
        @Override
        public void onSubmit(SubmitEvent event) {
            logger.info("submit handler pushed");
        }
    });
    fileForm.submit();
}

I could not find a method to configure FileUpload to use “myFile”.
I understood that this is done for browser-security reasons, but it is a massive obstacle when writing testcases.

Does there exist a way to specify filenames for FileUpload for testcases within gwt?

Answer 1

No.

But then one could wonder what is it that you’re actually trying to test?

• the submit / submit-complete handlers? You’d better fire the events directly at the FormPanel; you could also refactor your code to use some MV* pattern so that the code you’re actually testing is not tied to GWT widgets, then you can use a vanilla JUnit test.
• the servlet? Then don’t use a GWTTestCase, use HttpClient or anything similar and make a request against your servlet, running in a server (best done as an integration test; have a look at Arquillian to make it easier to setup)
• the whole interaction between the FormPanel+FileUpload and servlet? Then don’t use a GWTTestCase, use Selenium to drive a browser talking to a running server (best done as an integration test or acceptance test)