1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/workers/Worker-structure-message.html b/testing/web-platform/tests/workers/Worker-structure-message.html
new file mode 100644
index 0000000000..9eb12dc6c5
--- /dev/null
+++ b/testing/web-platform/tests/workers/Worker-structure-message.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Test that pages and workers can send Structure Message to one another.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(t => {
+  let worker;
+
+  return new Promise(resolve => {
+    worker = new Worker("support/Worker-structure-message.js");
+    worker.onmessage = resolve;
+    worker.postMessage({
+      operation: 'find-edges',
+      input: new ArrayBuffer(20),
+      threshold: 0.6
+    });
+  }).then(evt => {
+    assert_false(evt.data.startsWith('FAIL'));
+    return new Promise(resolve => worker.onmessage = resolve);
+  }).then(evt => {
+    assert_equals(evt.data.operation, 'find-edges');
+    assert_true(ArrayBuffer.prototype.isPrototypeOf(evt.data.input));
+    assert_equals(evt.data.input.byteLength, 20);
+    assert_equals(evt.data.threshold, 0.6);
+  });
+}, 'Tests sending structure message to/from worker.');
+</script>