Test renaming when uploading over a file that already exists.
function testExistingRename() {
$edit = array(
'file_test_replace' => FILE_EXISTS_RENAME,
'files[file_test_upload]' => drupal_realpath($this->image->uri),
);
$this
->drupalPost('file-test/upload', $edit, t('Submit'));
$this
->assertResponse(200, t('Received a 200 response for posted test file.'));
$this
->assertRaw(t('You WIN!'), t('Found the success message.'));
// Check that the correct hooks were called.
$this
->assertFileHooksCalled(array(
'validate',
'insert',
));
}