1 files changed, 66 insertions, 0 deletions
diff --git a/testing/web-platform/tests/shape-detection/resources/single-detection-helpers.js b/testing/web-platform/tests/shape-detection/resources/single-detection-helpers.js
new file mode 100644
index 0000000000..bbd2bda96b
--- /dev/null
+++ b/testing/web-platform/tests/shape-detection/resources/single-detection-helpers.js
@@ -0,0 +1,66 @@
+function imageLoadedPromise(image) {
+    return new Promise(function(resolve, reject) {
+        if (image.complete)
+            resolve();
+        image.addEventListener("load", resolve, { once: true });
+    });
+}
+
+function videoLoadedPromise(video) {
+    return new Promise(function(resolve, reject) {
+        if (video.readyState == 4)
+            resolve();
+        else {
+            video.addEventListener("loadeddata", resolve, { once: true });
+            video.addEventListener("error", reject, { once: true });
+        }
+    });
+}
+
+function waitForNFrames(count) {
+    if (count <= 0)
+         return Promise.reject(new TypeError("count should be greater than 0!"));
+
+    return new Promise(resolve => {
+        function tick() {
+            (--count) ? requestAnimationFrame(tick) : resolve();
+        }
+        requestAnimationFrame(tick);
+    });
+}
+
+function seekTo(video, time) {
+    return new Promise(function(resolve, reject) {
+        video.addEventListener("seeked", async function() {
+            /* Work around flakiness in video players... */
+            await waitForNFrames(3);
+            resolve();
+        }, { once: true });
+        video.currentTime = time;
+    });
+}
+
+function checkBoundingBox(actual, expected, fuzziness) {
+    assert_equals(actual.constructor.name, "DOMRectReadOnly");
+    assert_approx_equals(actual.left, expected.left, fuzziness);
+    assert_approx_equals(actual.right, expected.right, fuzziness);
+    assert_approx_equals(actual.top, expected.top, fuzziness);
+    assert_approx_equals(actual.bottom, expected.bottom, fuzziness);
+}
+
+function checkPointsLieWithinBoundingBox(points, boundingBox) {
+    for (point of points) {
+        assert_between_inclusive(point.x, boundingBox.left, boundingBox.right);
+        assert_between_inclusive(point.y, boundingBox.top, boundingBox.bottom);
+    }
+}
+
+function checkPointIsNear(actual, expected, fuzzinessX, fuzzinessY) {
+    assert_approx_equals(actual.x, expected.x, fuzzinessX);
+    assert_approx_equals(actual.y, expected.y, fuzzinessY);
+}
+
+function checkPointsAreNear(actual, expected, fuzzinessX, fuzzinessY) {
+    for (point of actual)
+        checkPointIsNear(point, expected, fuzzinessX, fuzzinessY);
+}