1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webauthn/credblob-not-supported.https.html b/testing/web-platform/tests/webauthn/credblob-not-supported.https.html
new file mode 100644
index 0000000000..0f9514ba5e
--- /dev/null
+++ b/testing/web-platform/tests/webauthn/credblob-not-supported.https.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>credBlob extension tests</title>
+<meta name="timeout" content="long">
+<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=helpers.js></script>
+<body></body>
+<script>
+"use strict";
+
+const blobu8 = new Uint8Array(16);
+window.crypto.getRandomValues(blobu8);
+const blob = blobu8.buffer;
+
+virtualAuthenticatorPromiseTest(async t => {
+  const cred = await createCredential({
+    options: {
+      publicKey: {
+        extensions: {
+          credBlob: blob,
+        },
+      },
+    },
+  });
+
+  const createExtensions = cred.getClientExtensionResults();
+  assert_own_property(createExtensions, "credBlob");
+  assert_equals(createExtensions.credBlob, false, "extension supported at create time");
+}, {
+  protocol: "ctap2_1",
+  extensions: [],
+}, "creation requesting credBlob without authenticator support");
+</script>