--- /dev/null
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\filefield_sources\Tests\EmptyValuesTest.
+ */
+
+namespace Drupal\filefield_sources\Tests;
+
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+
+/**
+ * Tests empty values.
+ *
+ * @group filefield_sources
+ */
+class EmptyValuesTest extends FileFieldSourcesTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = array('imce');
+
+ /**
+ * Sets up for empty values test case.
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->setUpImce();
+ }
+
+ /**
+ * Tests all sources enabled.
+ */
+ public function testAllSourcesEnabled() {
+ // Change allowed number of values.
+ $this->drupalPostForm('admin/structure/types/manage/' . $this->typeName . '/fields/node.' . $this->typeName . '.' . $this->fieldName . '/storage', array('cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED), t('Save field settings'));
+
+ $this->enableSources(array(
+ 'upload' => TRUE,
+ 'remote' => TRUE,
+ 'clipboard' => TRUE,
+ 'reference' => TRUE,
+ 'attach' => TRUE,
+ 'imce' => TRUE,
+ ));
+
+ // Upload a file by 'Remote' source.
+ $this->uploadFileByRemoteSource();
+
+ // Upload a file by 'Reference' source.
+ $this->uploadFileByReferenceSource();
+
+ // Upload a file by 'Clipboard' source.
+ $this->uploadFileByClipboardSource();
+
+ // Upload a file by 'Attach' source.
+ $this->uploadFileByAttachSource();
+
+ // Upload a file by 'Upload' source.
+ $this->uploadFileByUploadSource('', '', 0, TRUE);
+
+ // Upload a file by 'Imce' source.
+ $this->uploadFileByImceSource();
+
+ $this->assertUniqueSubmitButtons();
+ }
+
+ /**
+ * Check that there is only one submit button of a source.
+ */
+ protected function assertUniqueSubmitButtons() {
+ $buttons = array(
+ $this->fieldName . '_0_attach' => t('Attach'),
+ $this->fieldName . '_0_clipboard_upload_button' => t('Upload'),
+ $this->fieldName . '_0_autocomplete_select' => t('Select'),
+ $this->fieldName . '_0_transfer' => t('Transfer'),
+ $this->fieldName . '_0_upload_button' => t('Upload'),
+ $this->fieldName . '_0_imce_select' => t('Select'),
+ );
+ foreach ($buttons as $button_name => $button_label) {
+ // Ensure that there is only one button with name.
+ $buttons = $this->xpath('//input[@name="' . $button_name . '" and @value="' . $button_label . '"]');
+ $this->assertEqual(count($buttons), 1, format_string('There is only one button with name %name and label %label', array('%name' => $button_name, '%label' => $button_label)));
+ }
+ }
+
+}