diff --git a/core/modules/color/tests/src/Kernel/Migrate/d7/MigrateColorTest.php b/core/modules/color/tests/src/Kernel/Migrate/d7/MigrateColorTest.php
index f554d7f0fc..946d1e38c5 100644
--- a/core/modules/color/tests/src/Kernel/Migrate/d7/MigrateColorTest.php
+++ b/core/modules/color/tests/src/Kernel/Migrate/d7/MigrateColorTest.php
@@ -51,6 +51,8 @@ public function testMigrateColor() {
     ];
     $this->assertSame($palette, $config->get('palette'));
     $this->assertSame(['public://color/bartik-e0e23ad7/colors.css'], $config->get('stylesheets'));
+    // Test that the screenshot was not migrated.
+    $this->assertNull($config->get('screenshot'));
 
     // Test that garland was not migrated.
     $this->assertEmpty(\Drupal::config('color.theme.garland')->get());
diff --git a/core/modules/color/tests/src/Kernel/Plugin/migrate/source/d7/ColorTest.php b/core/modules/color/tests/src/Kernel/Plugin/migrate/source/d7/ColorTest.php
index b9f9a5a5af..cb634a9c63 100644
--- a/core/modules/color/tests/src/Kernel/Plugin/migrate/source/d7/ColorTest.php
+++ b/core/modules/color/tests/src/Kernel/Plugin/migrate/source/d7/ColorTest.php
@@ -61,7 +61,7 @@ public function providerSource() {
       ],
       [
         'name' => 'color_custom_stylesheets',
-        'value' => ['public:://color/custom-beadedff/screenshot.png'],
+        'value' => ['public:://color/custom-beadedff/colors.css'],
       ],
     ];
 
@@ -119,7 +119,7 @@ public function providerSource() {
       ],
       [
         'name' => 'color_custom_stylesheets',
-        'value' => ['public:://color/custom-beadedff/screenshot.png'],
+        'value' => ['public:://color/custom-beadedff/colors.css'],
       ],
     ];