1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/editing/dnd/resources/test-helper.js b/testing/web-platform/tests/html/editing/dnd/resources/test-helper.js
new file mode 100644
index 0000000000..fa9ec20c62
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+++ b/testing/web-platform/tests/html/editing/dnd/resources/test-helper.js
@@ -0,0 +1,50 @@
+'use strict';
+
+// Moves the pointer to the center of `element`. If `element` is contained within an `iframe`, use
+// the `iframe` parameter to indicate which `iframe` contains `element`. This function
+// returns a promise that will resolve once the pointer has been moved.
+
+const mouseMoveToCenter = (element, iframe = undefined) => {
+  let clientRect = element.getBoundingClientRect();
+  let centerX = (clientRect.left + clientRect.right) / 2;
+  let centerY = (clientRect.top + clientRect.bottom) / 2;
+  if(iframe != undefined) {
+    clientRect = iframe.getBoundingClientRect();
+    centerX += clientRect.left;
+    centerY += clientRect.top;
+  }
+  return new test_driver.Actions()
+  .pointerMove(Math.ceil(centerX), Math.ceil(centerY))
+  .send();
+};
+
+// The dragDropTest function can be used for tests which require the drag and drop movement.
+// `dragElement` takes the element that needs to be dragged and `dropElement` is the element which
+// you want to drop the `dragElement` on. `onDropCallback` is called on the onDrop handler and the
+// test will only pass if this functions returns true. Also, if the `dropElement` is inside an
+// iframe, use the optional `iframe` parameter to specify an iframe element that contains the
+// `dropElement` to ensure that tests with an iframe pass.
+
+function dragDropTest(dragElement, dropElement, onDropCallBack, testDescription, iframe = undefined) {
+  promise_test((t) => new Promise(async (resolve, reject) => {
+    dropElement.addEventListener('drop', t.step_func((event) => {
+      if (onDropCallBack(event) == true) {
+        resolve();
+      } else {
+        reject();
+      }
+    }));
+    try {
+      await mouseMoveToCenter(dragElement);
+      await new test_driver.Actions()
+      .pointerDown()
+      .send();
+      await mouseMoveToCenter(dropElement, iframe);
+      await new test_driver.Actions()
+      .pointerUp()
+      .send();
+    } catch (e) {
+      reject(e);
+    }
+  }, testDescription));
+}