1 files changed, 61 insertions, 0 deletions
diff --git a/testing/web-platform/tests/resources/idlharness-shadowrealm.js b/testing/web-platform/tests/resources/idlharness-shadowrealm.js
new file mode 100644
index 0000000000..9484ca6f51
--- /dev/null
+++ b/testing/web-platform/tests/resources/idlharness-shadowrealm.js
@@ -0,0 +1,61 @@
+// TODO: it would be nice to support `idl_array.add_objects`
+function fetch_text(url) {
+    return fetch(url).then(function (r) {
+        if (!r.ok) {
+            throw new Error("Error fetching " + url + ".");
+        }
+        return r.text();
+    });
+}
+
+/**
+ * idl_test_shadowrealm is a promise_test wrapper that handles the fetching of the IDL, and
+ * running the code in a `ShadowRealm`, avoiding repetitive boilerplate.
+ *
+ * @see https://github.com/tc39/proposal-shadowrealm
+ * @param {String[]} srcs Spec name(s) for source idl files (fetched from
+ *      /interfaces/{name}.idl).
+ * @param {String[]} deps Spec name(s) for dependency idl files (fetched
+ *      from /interfaces/{name}.idl). Order is important - dependencies from
+ *      each source will only be included if they're already know to be a
+ *      dependency (i.e. have already been seen).
+ */
+function idl_test_shadowrealm(srcs, deps) {
+    promise_setup(async t => {
+        const realm = new ShadowRealm();
+        // https://github.com/web-platform-tests/wpt/issues/31996
+        realm.evaluate("globalThis.self = globalThis; undefined;");
+
+        realm.evaluate(`
+            globalThis.self.GLOBAL = {
+                isWindow: function() { return false; },
+                isWorker: function() { return false; },
+                isShadowRealm: function() { return true; },
+            }; undefined;
+        `);
+        const specs = await Promise.all(srcs.concat(deps).map(spec => {
+            return fetch_text("/interfaces/" + spec + ".idl");
+        }));
+        const idls = JSON.stringify(specs);
+        await new Promise(
+            realm.evaluate(`(resolve,reject) => {
+                (async () => {
+                    await import("/resources/testharness.js");
+                    await import("/resources/WebIDLParser.js");
+                    await import("/resources/idlharness.js");
+                    const idls = ${idls};
+                    const idl_array = new IdlArray();
+                    for (let i = 0; i < ${srcs.length}; i++) {
+                        idl_array.add_idls(idls[i]);
+                    }
+                    for (let i = ${srcs.length}; i < ${srcs.length + deps.length}; i++) {
+                        idl_array.add_dependency_idls(idls[i]);
+                    }
+                    idl_array.test();
+                })().then(resolve, (e) => reject(e.toString()));
+            }`)
+        );
+        await fetch_tests_from_shadow_realm(realm);
+    });
+}
+// vim: set expandtab shiftwidth=4 tabstop=4 foldmarker=@{,@} foldmethod=marker: