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diff --git a/web/modules/contrib/filefield_sources/src/Tests/EmptyValuesTest.php b/web/modules/contrib/filefield_sources/src/Tests/EmptyValuesTest.php
new file mode 100644
index 000000000..065ff5709
--- /dev/null
+++ b/web/modules/contrib/filefield_sources/src/Tests/EmptyValuesTest.php
@@ -0,0 +1,90 @@
+<?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)));
+    }
+  }
+
+}