only in patch2:
unchanged:
--- a/core/modules/responsive_image/tests/src/ResponsiveImageMappingConfigEntityUnitTest.php
+++ b/core/modules/responsive_image/tests/src/ResponsiveImageMappingConfigEntityUnitTest.php
@@ -85,7 +85,48 @@ public function testCalculateDependencies() {
   public function testHasMappings() {
     $entity = new ResponsiveImageMapping(array());
     $this->assertFalse($entity->hasMappings());
-    $entity->addMapping('test_breakpoint', '1x', 'test_style');
+    $entity->addMapping('test_breakpoint', '1x', array(
+        'mapping_type' => 'image_style',
+        'image_style' => '',
+        'sizes' => '',
+        'sizes_image_styles' => array(),
+    ));
+    $this->assertFalse($entity->hasMappings());
+    $entity->removeMappings();
+    $entity->addMapping('test_breakpoint', '1x', array(
+        'mapping_type' => 'sizes',
+        'image_style' => '',
+        'sizes' => '(min-width:700px) 700px, 100vw',
+        'sizes_image_styles' => array(),
+    ));
+    $this->assertFalse($entity->hasMappings());
+    $entity->removeMappings();
+    $entity->addMapping('test_breakpoint', '1x', array(
+        'mapping_type' => 'sizes',
+        'image_style' => '',
+        'sizes' => '',
+        'sizes_image_styles' => array(
+          'large' => 'large',
+        ),
+    ));
+    $this->assertFalse($entity->hasMappings());
+    $entity->removeMappings();
+    $entity->addMapping('test_breakpoint', '1x', array(
+        'mapping_type' => 'image_style',
+        'image_style' => 'large',
+        'sizes' => '',
+        'sizes_image_styles' => array(),
+    ));
+    $this->assertTrue($entity->hasMappings());
+    $entity->removeMappings();
+    $entity->addMapping('test_breakpoint', '1x', array(
+        'mapping_type' => 'sizes',
+        'image_style' => '',
+        'sizes' => '(min-width:700px) 700px, 100vw',
+        'sizes_image_styles' => array(
+          'large' => 'large',
+        ),
+    ));
     $this->assertTrue($entity->hasMappings());
   }