1 files changed, 52 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-animations/resources/timing-utils.js b/testing/web-platform/tests/web-animations/resources/timing-utils.js
new file mode 100644
index 0000000000..fba62a1f6d
--- /dev/null
+++ b/testing/web-platform/tests/web-animations/resources/timing-utils.js
@@ -0,0 +1,52 @@
+'use strict';
+
+// =======================================
+//
+// Utility functions for testing timing
+//
+// =======================================
+
+
+// ------------------------------
+//  Helper functions
+// ------------------------------
+
+// Utility function to check that a subset of timing properties have their
+// default values.
+function assert_default_timing_except(effect, propertiesToSkip) {
+  const defaults = {
+    delay: 0,
+    endDelay: 0,
+    fill: 'auto',
+    iterationStart: 0,
+    iterations: 1,
+    duration: 'auto',
+    direction: 'normal',
+    easing: 'linear',
+  };
+
+  for (const prop of Object.keys(defaults)) {
+    if (propertiesToSkip.includes(prop)) {
+      continue;
+    }
+
+    assert_equals(
+      effect.getTiming()[prop],
+      defaults[prop],
+      `${prop} parameter has default value:`
+    );
+  }
+}
+
+function waitForAnimationTime(animation, time) {
+  return new Promise((resolve) => {
+    function raf() {
+      if (animation.currentTime < time) {
+        requestAnimationFrame(raf);
+      } else {
+        resolve();
+      }
+    }
+    requestAnimationFrame(raf);
+  });
+}