1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/hr-time/basic.any.js b/testing/web-platform/tests/hr-time/basic.any.js
new file mode 100644
index 0000000000..4cd6e42dfc
--- /dev/null
+++ b/testing/web-platform/tests/hr-time/basic.any.js
@@ -0,0 +1,37 @@
+test(function() {
+  assert_true((self.performance !== undefined), "self.performance exists");
+  assert_equals(typeof self.performance, "object", "self.performance is an object");
+  assert_equals((typeof self.performance.now), "function", "self.performance.now() is a function");
+  assert_equals(typeof self.performance.now(), "number", "self.performance.now() returns a number");
+}, "self.performance.now() is a function that returns a number");
+
+test(function() {
+  assert_true(self.performance.now() > 0);
+}, "self.performance.now() returns a positive number");
+
+test(function() {
+    var now1 = self.performance.now();
+    var now2 = self.performance.now();
+    assert_true((now2-now1) >= 0);
+  }, "self.performance.now() difference is not negative");
+
+async_test(function() {
+  // Check whether the performance.now() method is close to Date() within 30ms (due to inaccuracies)
+  var initial_hrt = self.performance.now();
+  var initial_date = Date.now();
+  this.step_timeout(function() {
+    var final_hrt = self.performance.now();
+    var final_date = Date.now();
+    assert_approx_equals(final_hrt - initial_hrt, final_date - initial_date, 30, 'High resolution time value increased by approximately the same amount as time from date object');
+    this.done();
+  }, 2000);
+}, 'High resolution time has approximately the right relative magnitude');
+
+test(function() {
+  var didHandle = false;
+  self.performance.addEventListener("testEvent", function() {
+    didHandle = true;
+  }, { once: true} );
+  self.performance.dispatchEvent(new Event("testEvent"));
+  assert_true(didHandle, "Performance extends EventTarget, so event dispatching should work.");
+}, "Performance interface extends EventTarget.");