Mar 28, 2016
diff --git a/book/testing.rst b/book/testing.rst
    // Upload a file
    $form['photo']->upload('/path/to/lucas.jpg');

 If you use a :doc:`Collection of Forms </cookbook/form/form_collections>`,
 you can't add fields to the existing form (this results in an error
 ``Unreachable field "…"``). You can use the `submitWithAdditionalValues()`
 method in order to add new fields::

    $crawler = $client->submitWithAdditionalValues(
        $form,
        array(),
        // New values:
        array('task[tags][0][name]' => 'tag1'),
    );

    // The tag has been added.
    $this->assertEquals(1, $crawler->filter('ul.tags > li')->count());

 Where ``task[tags][0][name]`` is the name of a field usually created
 with Javascript.

 You can remove an existing field, e.g. a tag::

    // Get the values of the form.
    $values = $form->getPhpValues();

    // Remove the first tag.
    unset($values['task']['tags'][0]);

    // Submit the data.
    $crawler = $client->request($form->getMethod(), $form->getUri(),
        $values, $form->getPhpFiles());

    // The tag has been removed.
    $this->assertEquals(0, $crawler->filter('ul.tags > li')->count());

 .. tip::

    If you purposefully want to select "invalid" select/radio values, see
Original file line number	Diff line number	Diff line change
Expand Up		@@ -687,6 +687,39 @@ their type::
		// Upload a file
		$form['photo']->upload('/path/to/lucas.jpg');

		If you use a :doc:`Collection of Forms </cookbook/form/form_collections>`,
		you can't add fields to the existing form (this results in an error
		``Unreachable field "…"``). You can use the `submitWithAdditionalValues()`
		method in order to add new fields::

		$crawler = $client->submitWithAdditionalValues(
		$form,
		array(),
		// New values:
		array('task[tags][0][name]' => 'tag1'),
		);

		// The tag has been added.
		$this->assertEquals(1, $crawler->filter('ul.tags > li')->count());

		Where ``task[tags][0][name]`` is the name of a field usually created
		with Javascript.

		You can remove an existing field, e.g. a tag::

		// Get the values of the form.
		$values = $form->getPhpValues();

		// Remove the first tag.
		unset($values['task']['tags'][0]);

		// Submit the data.
		$crawler = $client->request($form->getMethod(), $form->getUri(),
		$values, $form->getPhpFiles());

		// The tag has been removed.
		$this->assertEquals(0, $crawler->filter('ul.tags > li')->count());

		.. tip::

		If you purposefully want to select "invalid" select/radio values, see
Expand Down