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diff --git a/testing/web-platform/tests/mediacapture-streams/GUM-invalid-facing-mode.https.html b/testing/web-platform/tests/mediacapture-streams/GUM-invalid-facing-mode.https.html
new file mode 100644
index 0000000000..8da6c9754e
--- /dev/null
+++ b/testing/web-platform/tests/mediacapture-streams/GUM-invalid-facing-mode.https.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<html>
+<head>
+<title>Invalid facingMode in getUserMedia</title>
+<link rel="help" href="https://w3c.github.io/mediacapture-main/#def-constraint-facingMode">
+</head>
+<body>
+<h1 class="instructions">Description</h1>
+<p class="instructions">This test checks that trying to set an empty facingMode
+  value in getUserMedia results in an OverconstrainedError.
+</p>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src=permission-helper.js></script>
+<script>
+promise_test(async () => {
+  await setMediaPermission("granted", ["camera"]);
+  try {
+    await navigator.mediaDevices.getUserMedia({video: {facingMode: {exact: ''}}});
+    assert_unreached("The empty string is not a valid facingMode");
+  } catch (error) {
+    assert_equals(error.name, "OverconstrainedError");
+    assert_equals(error.constraint, "facingMode");
+  };
+}, "Tests that setting an invalid facingMode constraint in getUserMedia fails");
+</script>
+</body>
+</html>