--- /dev/null
+<?php
+
+namespace Drupal\image\Tests;
+
+use Drupal\image\Entity\ImageStyle;
+
+/**
+ * Tests flushing of image styles.
+ *
+ * @group image
+ */
+class ImageStyleFlushTest extends ImageFieldTestBase {
+
+ /**
+ * Given an image style and a wrapper, generate an image.
+ */
+ public function createSampleImage($style, $wrapper) {
+ static $file;
+
+ if (!isset($file)) {
+ $files = $this->drupalGetTestFiles('image');
+ $file = reset($files);
+ }
+
+ // Make sure we have an image in our wrapper testing file directory.
+ $source_uri = file_unmanaged_copy($file->uri, $wrapper . '://');
+ // Build the derivative image.
+ $derivative_uri = $style->buildUri($source_uri);
+ $derivative = $style->createDerivative($source_uri, $derivative_uri);
+
+ return $derivative ? $derivative_uri : FALSE;
+ }
+
+ /**
+ * Count the number of images currently created for a style in a wrapper.
+ */
+ public function getImageCount($style, $wrapper) {
+ return count(file_scan_directory($wrapper . '://styles/' . $style->id(), '/.*/'));
+ }
+
+ /**
+ * General test to flush a style.
+ */
+ public function testFlush() {
+
+ // Setup a style to be created and effects to add to it.
+ $style_name = strtolower($this->randomMachineName(10));
+ $style_label = $this->randomString();
+ $style_path = 'admin/config/media/image-styles/manage/' . $style_name;
+ $effect_edits = [
+ 'image_resize' => [
+ 'data[width]' => 100,
+ 'data[height]' => 101,
+ ],
+ 'image_scale' => [
+ 'data[width]' => 110,
+ 'data[height]' => 111,
+ 'data[upscale]' => 1,
+ ],
+ ];
+
+ // Add style form.
+ $edit = [
+ 'name' => $style_name,
+ 'label' => $style_label,
+ ];
+ $this->drupalPostForm('admin/config/media/image-styles/add', $edit, t('Create new style'));
+
+ // Add each sample effect to the style.
+ foreach ($effect_edits as $effect => $edit) {
+ // Add the effect.
+ $this->drupalPostForm($style_path, ['new' => $effect], t('Add'));
+ if (!empty($edit)) {
+ $this->drupalPostForm(NULL, $edit, t('Add effect'));
+ }
+ }
+
+ // Load the saved image style.
+ $style = ImageStyle::load($style_name);
+
+ // Create an image for the 'public' wrapper.
+ $image_path = $this->createSampleImage($style, 'public');
+ // Expecting to find 2 images, one is the sample.png image shown in
+ // image style preview.
+ $this->assertEqual($this->getImageCount($style, 'public'), 2, format_string('Image style %style image %file successfully generated.', ['%style' => $style->label(), '%file' => $image_path]));
+
+ // Create an image for the 'private' wrapper.
+ $image_path = $this->createSampleImage($style, 'private');
+ $this->assertEqual($this->getImageCount($style, 'private'), 1, format_string('Image style %style image %file successfully generated.', ['%style' => $style->label(), '%file' => $image_path]));
+
+ // Remove the 'image_scale' effect and updates the style, which in turn
+ // forces an image style flush.
+ $style_path = 'admin/config/media/image-styles/manage/' . $style->id();
+ $uuids = [];
+ foreach ($style->getEffects() as $uuid => $effect) {
+ $uuids[$effect->getPluginId()] = $uuid;
+ }
+ $this->drupalPostForm($style_path . '/effects/' . $uuids['image_scale'] . '/delete', [], t('Delete'));
+ $this->assertResponse(200);
+ $this->drupalPostForm($style_path, [], t('Update style'));
+ $this->assertResponse(200);
+
+ // Post flush, expected 1 image in the 'public' wrapper (sample.png).
+ $this->assertEqual($this->getImageCount($style, 'public'), 1, format_string('Image style %style flushed correctly for %wrapper wrapper.', ['%style' => $style->label(), '%wrapper' => 'public']));
+
+ // Post flush, expected no image in the 'private' wrapper.
+ $this->assertEqual($this->getImageCount($style, 'private'), 0, format_string('Image style %style flushed correctly for %wrapper wrapper.', ['%style' => $style->label(), '%wrapper' => 'private']));
+ }
+
+}