diff --git a/plugins/embed-optimizer/tests/test-cases/single-youtube-embed-inside-viewport-with-only-mobile-url-metrics.php b/plugins/embed-optimizer/tests/test-cases/single-youtube-embed-inside-viewport-with-only-mobile-url-metrics.php
new file mode 100644
index 000000000..b476aca04
--- /dev/null
+++ b/plugins/embed-optimizer/tests/test-cases/single-youtube-embed-inside-viewport-with-only-mobile-url-metrics.php
@@ -0,0 +1,57 @@
+ static function ( Test_Embed_Optimizer_Optimization_Detective $test_case ): void {
+ OD_URL_Metrics_Post_Type::store_url_metric(
+ od_get_url_metrics_slug( od_get_normalized_query_vars() ),
+ $test_case->get_sample_url_metric(
+ array(
+ 'viewport_width' => 100,
+ 'elements' => array(
+ array(
+ 'xpath' => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::FIGURE]/*[1][self::DIV]',
+ 'isLCP' => false,
+ 'intersectionRatio' => 1,
+ 'resizedBoundingClientRect' => array_merge( $test_case->get_sample_dom_rect(), array( 'height' => 500 ) ),
+ ),
+ ),
+ )
+ )
+ );
+ },
+ 'buffer' => '
+
+
+
+ ...
+
+
+
+
+
+
+
+
+
+ ',
+ 'expected' => '
+
+
+
+ ...
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ',
+);