Test the BlobEvent constructor (web-platform-tests#3749)

This is for the new BlobEvent("type", { data: null }) test, which fails in Chromium, see https://crbug.com/647693
ASagaidak · Oct 6, 2016 · 355aa7b · 355aa7b
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diff --git a/mediacapture-record/BlobEvent-constructor.html b/mediacapture-record/BlobEvent-constructor.html
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+<!doctype html>
+<title>BlobEvent constructor</title>
+<link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#blob-event">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function() {
+  assert_equals(BlobEvent.length, 2);
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type");
+  });
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type", null);
+  });
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type", undefined);
+  });
+}, "The BlobEventInit dictionary is required");
+
+test(function() {
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type", {});
+  });
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type", { data: null });
+  });
+  assert_throws(new TypeError, function() {
+    new BlobEvent("type", { data: undefined });
+  });
+}, "The BlobEventInit dictionary's data member is required.");
+
+test(function() {
+  var blob = new Blob();
+  var event = new BlobEvent("type", { data: blob });
+  assert_equals(event.type, "type");
+  assert_equals(event.data, blob);
+}, "The BlobEvent instance's data attribute is set.");
+</script>
diff --git a/mediacapture-record/OWNERS b/mediacapture-record/OWNERS
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+@miguelao