1 files changed, 80 insertions, 0 deletions
diff --git a/testing/web-platform/tests/resources/test/nested-testharness.js b/testing/web-platform/tests/resources/test/nested-testharness.js
new file mode 100644
index 0000000000..d97c1568c7
--- /dev/null
+++ b/testing/web-platform/tests/resources/test/nested-testharness.js
@@ -0,0 +1,80 @@
+'use strict';
+
+/**
+ * Execute testharness.js and one or more scripts in an iframe. Report the
+ * results of the execution.
+ *
+ * @param {...function|...string} bodies - a function body. If specified as a
+ *                                         function object, it will be
+ *                                         serialized to a string using the
+ *                                         built-in
+ *                                         `Function.prototype.toString` prior
+ *                                         to inclusion in the generated
+ *                                         iframe.
+ *
+ * @returns {Promise} eventual value describing the result of the test
+ *                    execution; the summary object has two properties:
+ *                    `harness` (a string describing the harness status) and
+ *                    `tests` (an object whose "own" property names are the
+ *                    titles of the defined sub-tests and whose associated
+ *                    values are the subtest statuses).
+ */
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: getEnumProp(status, status.status),
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}