addedfile
function is not adding files to dropzone.files
so it must be added manually:
// add file - OK
var mockFile = { name: 'test.jpg', size: 0, status: 'success' };
docsDropzone.emit( "addedfile", mockFile );
docsDropzone.emit( "thumbnail", mockFile, 'test.jpg' );
docsDropzone.files.push( mockFile ); // file must be added manually
// remove files - NOW OK
docsDropzone.removeAllFiles( true );