protected void wait4EmptyMesssage(DataTable uploadedFiles) {
        PrimeSelenium.waitGui().until(ExpectedConditions.visibilityOf(
                uploadedFiles.findElement(By.tagName("tbody")).findElement(By.cssSelector("tr.ui-datatable-empty-message"))));
    }
Uploaded files are displayed in a data table with columns name and size.
@param uploadedFiles the data tble to check against
@param files the (client side) files uploaded
primefaces-integration-tests/src/test/java/org/primefaces/integrationtests/fileupload/AbstractFileUploadTest.java