1 files changed, 74 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/resources/element-timing-helpers.js b/testing/web-platform/tests/element-timing/resources/element-timing-helpers.js
new file mode 100644
index 0000000000..cd0a023f04
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/resources/element-timing-helpers.js
@@ -0,0 +1,74 @@
+// Common checks between checkElement() and checkElementWithoutResourceTiming().
+function checkElementInternal(entry, expectedUrl, expectedIdentifier, expectedID, beforeRender,
+    expectedElement) {
+  assert_equals(entry.entryType, 'element', 'entryType does not match');
+  assert_equals(entry.url, expectedUrl, 'url does not match');
+  assert_equals(entry.identifier, expectedIdentifier, 'identifier does not match');
+  if (beforeRender != 0) {
+    // In this case, renderTime is not 0.
+    assert_greater_than(entry.renderTime, 0, 'renderTime should be nonzero');
+    assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime');
+  } else {
+    // In this case, renderTime is 0, so compare to loadTime.
+    assert_equals(entry.renderTime, 0, 'renderTime should be zero');
+    assert_equals(entry.startTime, entry.loadTime, 'startTime should equal loadTime');
+  }
+  assert_equals(entry.duration, 0, 'duration should be 0');
+  assert_equals(entry.id, expectedID, 'id does not match');
+  assert_greater_than_equal(entry.renderTime, beforeRender, 'renderTime greater than beforeRender');
+  assert_greater_than_equal(performance.now(), entry.renderTime, 'renderTime bounded by now()');
+  if (expectedElement !== null) {
+    assert_equals(entry.element, expectedElement, 'element does not match');
+    assert_equals(entry.identifier, expectedElement.elementTiming,
+        'identifier must be the elementtiming of the element');
+    assert_equals(entry.id, expectedElement.id, 'id must be the id of the element');
+  }
+}
+
+// Checks that this is an ElementTiming entry with url |expectedUrl|. It also
+// does a very basic check on |renderTime|: after |beforeRender| and before now().
+function checkElement(entry, expectedUrl, expectedIdentifier, expectedID, beforeRender,
+    expectedElement) {
+  checkElementInternal(entry, expectedUrl, expectedIdentifier, expectedID, beforeRender,
+      expectedElement);
+  assert_equals(entry.name, 'image-paint');
+  const rt_entries = performance.getEntriesByName(expectedUrl, 'resource');
+  assert_equals(rt_entries.length, 1);
+  assert_greater_than_equal(entry.loadTime, rt_entries[0].responseEnd,
+    'Image loadTime is after the resource responseEnd');
+}
+
+function checkElementWithoutResourceTiming(entry, expectedUrl, expectedIdentifier,
+    expectedID, beforeRender, expectedElement) {
+  checkElementInternal(entry, expectedUrl, expectedIdentifier, expectedID, beforeRender,
+      expectedElement);
+  assert_equals(entry.name, 'image-paint');
+  // No associated resource from ResourceTiming, so not much to compare loadTime with.
+  assert_greater_than(entry.loadTime, 0);
+}
+
+// Checks that the rect matches the desired values [left right top bottom].
+function checkRect(entry, expected, description="") {
+  assert_equals(entry.intersectionRect.left, expected[0],
+    'left of rect ' + description);
+  assert_equals(entry.intersectionRect.right, expected[1],
+    'right of rect ' + description);
+  assert_equals(entry.intersectionRect.top, expected[2],
+    'top of rect ' + description);
+  assert_equals(entry.intersectionRect.bottom, expected[3],
+    'bottom of rect ' + description);
+}
+
+// Checks that the intrinsic size matches the desired values.
+function checkNaturalSize(entry, width, height) {
+  assert_equals(entry.naturalWidth, width);
+  assert_equals(entry.naturalHeight, height);
+}
+
+function checkTextElement(entry, expectedIdentifier, expectedID, beforeRender,
+    expectedElement) {
+  checkElementInternal(entry, '', expectedIdentifier, expectedID, beforeRender,
+      expectedElement);
+  assert_equals(entry.name, 'text-paint');
+  assert_equals(entry.loadTime, 0);
+}