1 files changed, 66 insertions, 0 deletions
diff --git a/testing/web-platform/tests/user-timing/structured-serialize-detail.any.js b/testing/web-platform/tests/user-timing/structured-serialize-detail.any.js
new file mode 100644
index 0000000000..dcceffde27
--- /dev/null
+++ b/testing/web-platform/tests/user-timing/structured-serialize-detail.any.js
@@ -0,0 +1,66 @@
+test(function() {
+  performance.clearMarks();
+  const detail = { randomInfo: 123 }
+  const markEntry = new PerformanceMark("A", { detail });
+  assert_equals(markEntry.detail.randomInfo, detail.randomInfo);
+  assert_not_equals(markEntry.detail, detail);
+}, "The detail property in the mark constructor should be structured-clone.");
+
+test(function() {
+  performance.clearMarks();
+  const detail = { randomInfo: 123 }
+  const markEntry = performance.mark("A", { detail });
+  assert_equals(markEntry.detail.randomInfo, detail.randomInfo);
+  assert_not_equals(markEntry.detail, detail);
+}, "The detail property in the mark method should be structured-clone.");
+
+test(function() {
+  performance.clearMarks();
+  const markEntry = performance.mark("A");
+  assert_equals(markEntry.detail, null);
+}, "When accessing detail from a mark entry and the detail is not provided, just return a null value.");
+
+test(function() {
+  performance.clearMarks();
+  const detail = { unserializable: Symbol() };
+  assert_throws_dom("DataCloneError", ()=>{
+    new PerformanceMark("A", { detail });
+  }, "Trying to structured-serialize a Symbol.");
+}, "Mark: Throw an exception when the detail property cannot be structured-serialized.");
+
+test(function() {
+  performance.clearMeasures();
+  const detail = { randomInfo: 123 }
+  const measureEntry = performance.measure("A", { start: 0, detail });
+  assert_equals(measureEntry.detail.randomInfo, detail.randomInfo);
+  assert_not_equals(measureEntry.detail, detail);
+}, "The detail property in the measure method should be structured-clone.");
+
+test(function() {
+  performance.clearMeasures();
+  const detail = { randomInfo: 123 }
+  const measureEntry = performance.measure("A", { start: 0, detail });
+  assert_equals(measureEntry.detail, measureEntry.detail);
+}, "The detail property in the measure method should be the same reference.");
+
+test(function() {
+  performance.clearMeasures();
+  const measureEntry = performance.measure("A");
+  assert_equals(measureEntry.detail, null);
+}, "When accessing detail from a measure entry and the detail is not provided, just return a null value.");
+
+test(function() {
+  performance.clearMeasures();
+  const detail = { unserializable: Symbol() };
+  assert_throws_dom("DataCloneError", ()=>{
+    performance.measure("A", { start: 0, detail });
+  }, "Trying to structured-serialize a Symbol.");
+}, "Measure: Throw an exception when the detail property cannot be structured-serialized.");
+
+test(function() {
+  const bar = { 1: 2 };
+  const detail = { foo: 1, bar };
+  const mark = performance.mark("m", { detail });
+  detail.foo = 2;
+  assert_equals(mark.detail.foo, 1);
+}, "The detail object is cloned when passed to mark API.");