Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/image/tests/modules/image_module_test/config/schema/image_module_test.schema.yml

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+image.style.*.third_party.image_module_test:
+  type: mapping
+  label: 'Schema for image_module_test module additions to image_style entity'
+  mapping:
+    foo:
+      type: string
+      label: 'Label for foo'

core/modules/image/tests/modules/image_module_test/image_module_test.info.yml

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+name: 'Image test'
+type: module
+description: 'Provides hook implementations for testing Image module functionality.'
+package: Testing
+version: VERSION
+core: 8.x

core/modules/image/tests/modules/image_module_test/image_module_test.module

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+<?php
+
+/**
+ * @file
+ * Provides Image module hook implementations for testing purposes.
+ */
+
+use Drupal\image\ImageStyleInterface;
+
+function image_module_test_file_download($uri) {
+  $default_uri = \Drupal::state()->get('image.test_file_download') ?: FALSE;
+  if ($default_uri == $uri) {
+    return array('X-Image-Owned-By' => 'image_module_test');
+  }
+}
+
+/**
+ * Implements hook_image_effect_info_alter().
+ *
+ * Used to keep a count of cache misses in \Drupal\image\ImageEffectManager.
+ */
+function image_module_test_image_effect_info_alter(&$effects) {
+  $image_effects_definition_called = &drupal_static(__FUNCTION__, 0);
+  $image_effects_definition_called++;
+}
+
+/**
+ * Implements hook_image_style_presave().
+ *
+ * Used to save test third party settings in the image style entity.
+ */
+function image_module_test_image_style_presave(ImageStyleInterface $style) {
+  $style->setThirdPartySetting('image_module_test', 'foo', 'bar');
+}

core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/NullTestImageEffect.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_module_test\Plugin\ImageEffect\NullTestImageEffect.
+ */
+
+namespace Drupal\image_module_test\Plugin\ImageEffect;
+
+use Drupal\Core\Image\ImageInterface;
+use Drupal\image\ImageEffectBase;
+
+/**
+ * Performs no operation on an image resource.
+ *
+ * @ImageEffect(
+ *   id = "image_module_test_null",
+ *   label = @Translation("Image module test")
+ * )
+ */
+class NullTestImageEffect extends ImageEffectBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transformDimensions(array &$dimensions) {
+    // Unset image dimensions.
+    $dimensions['width'] = $dimensions['height'] = NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applyEffect(ImageInterface $image) {
+    return TRUE;
+  }
+
+}

core/modules/image/tests/modules/image_test_views/image_test_views.info.yml

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+name: 'Image test views'
+type: module
+description: 'Provides default views for views image tests.'
+package: Testing
+version: VERSION
+core: 8.x
+dependencies:
+  - image
+  - views

core/modules/image/tests/modules/image_test_views/test_views/views.view.test_image_user_image_data.yml

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+langcode: en
+status: true
+dependencies:
+  module:
+    - file
+    - user
+id: test_image_user_image_data
+label: test_image_user_image_data
+module: views
+description: ''
+tag: ''
+base_table: users_field_data
+base_field: uid
+core: 8.x
+display:
+  default:
+    display_plugin: default
+    id: default
+    display_title: Master
+    position: 0
+    display_options:
+      access:
+        type: perm
+        options:
+          perm: 'access user profiles'
+      cache:
+        type: tag
+      style:
+        type: table
+        options:
+          grouping: {  }
+          row_class: ''
+          default_row_class: true
+          override: true
+          sticky: false
+          caption: ''
+          summary: ''
+          description: ''
+          columns:
+            name: name
+            fid: fid
+          info:
+            name:
+              sortable: false
+              default_sort_order: asc
+              align: ''
+              separator: ''
+              empty_column: false
+              responsive: ''
+            fid:
+              sortable: false
+              default_sort_order: asc
+              align: ''
+              separator: ''
+              empty_column: false
+              responsive: ''
+          default: '-1'
+          empty_table: false
+      row:
+        type: fields
+        options:
+          inline: {  }
+          separator: ''
+          hide_empty: false
+          default_field_elements: true
+      relationships:
+        user_picture_target_id:
+          id: user_picture_target_id
+          table: user__user_picture
+          field: user_picture_target_id
+          relationship: none
+          group_type: group
+          admin_label: 'image from user_picture'
+          required: true
+          plugin_id: standard
+      arguments: {  }
+      display_extenders: {  }