Fetch: basic syntax tests for Cross-Origin-Resource-Policy

Supplements web-platform-tests#11171.

For whatwg/fetch#733.

Author: annevk

fetch/cross-origin-resource-policy/syntax.any.js

@@ -0,0 +1,18 @@
+// META: script=/common/get-host-info.sub.js
+
+const crossOriginURL = get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/cross-origin-resource-policy/resources/hello.py?corp=";
+
+[
+  "same",
+  "same, same-origin",
+  "SAME-ORIGIN",
+  "Same-Origin",
+  "same-origin, <>",
+  "same-origin, same-origin"
+].forEach(incorrectHeaderValue => {
+  // Note: an incorrect value results in a successful load, so this test is only meaningful in
+  // implementations with support for the header.
+  promise_test(t => {
+    return fetch(crossOriginURL + encodeURIComponent(incorrectHeaderValue), { mode: "no-cors" });
+  }, "Parsing Cross-Origin-Resource-Policy: " + incorrectHeaderValue);
+});