diff --git a/utils/testrunner/utils.js b/utils/testrunner/utils.js
new file mode 100644
index 0000000000..43e655646f
--- /dev/null
+++ b/utils/testrunner/utils.js
@@ -0,0 +1,32 @@
+const path = require('path');
+
+module.exports = {
+  getLocation: function(filename) {
+    const error = new Error();
+    const stackFrames = error.stack.split('\n').slice(1);
+    // Find first stackframe that doesn't point to this file.
+    for (let frame of stackFrames) {
+      frame = frame.trim();
+      if (!frame.startsWith('at '))
+        return null;
+      if (frame.endsWith(')')) {
+        const from = frame.indexOf('(');
+        frame = frame.substring(from + 1, frame.length - 1);
+      } else {
+        frame = frame.substring('at '.length);
+      }
+
+      const match = frame.match(/^(.*):(\d+):(\d+)$/);
+      if (!match)
+        return null;
+      const filePath = match[1];
+      const lineNumber = parseInt(match[2], 10);
+      const columnNumber = parseInt(match[3], 10);
+      if (filePath === __filename || filePath === filename)
+        continue;
+      const fileName = filePath.split(path.sep).pop();
+      return { fileName, filePath, lineNumber, columnNumber };
+    }
+    return null;
+  },
+};