diff --git a/functions/postwomanTesting.js b/functions/postwomanTesting.js
new file mode 100644
index 000000000..096ee9d32
--- /dev/null
+++ b/functions/postwomanTesting.js
@@ -0,0 +1,31 @@
+export default function runTestScriptWitVariables(script, variables) {
+
+  let pw = {
+    assert
+    // globals that the script is allowed to have access to.
+  };
+  Object.assign(pw, variables);
+
+  // run pre-request script within this function so that it has access to the pw object.
+  let errors = null;
+  try {
+    new Function("pw", script)(pw);
+  }
+  catch (e) {
+    errors = e;
+  }
+  return errors;
+
+}
+
+function assert(expression) {
+  if (!expression) {
+    throw {name: "PostWomanTestError", message: "expression evaluated to false"}
+  }
+}
+
+class PostwomanTestFailure {
+  constructor(message) {
+    return {message}
+  }
+}