1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/performance-timeline/performanceobservers.js b/testing/web-platform/tests/performance-timeline/performanceobservers.js
new file mode 100644
index 000000000..08587694e
--- /dev/null
+++ b/testing/web-platform/tests/performance-timeline/performanceobservers.js
@@ -0,0 +1,21 @@
+// Compares a performance entry to a predefined one
+// perfEntriesToCheck is an array of performance entries from the user agent
+// expectedEntries is an array of performance entries minted by the test
+function checkEntries(perfEntriesToCheck, expectedEntries) {
+  function findMatch(pe) {
+    // we match based on entryType and name
+    for (var i = expectedEntries.length - 1; i >= 0; i--) {
+      var ex = expectedEntries[i];
+      if (ex.entryType === pe.entryType && ex.name === pe.name) {
+        return ex;
+      }
+    }
+    return null;
+  }
+
+  assert_equals(perfEntriesToCheck.length, expectedEntries.length, "performance entries must match");
+
+  perfEntriesToCheck.forEach(function (pe1) {
+    assert_not_equals(findMatch(pe1), null, "Entry matches");
+  });
+}