[WebIDL] Add tests for iterator objects and prototypes (#8796)

web-platform-tests · Feb 23, 2018 · 73f03e3 · 73f03e3
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diff --git a/WebIDL/ecmascript-binding/default-iterator-object.html b/WebIDL/ecmascript-binding/default-iterator-object.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Default iterator objects</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(() => {
+  const iterator1 = new URLSearchParams()[Symbol.iterator]();
+  const iterator2 = new URLSearchParams().keys();
+  const iterator3 = new URLSearchParams().values();
+  const iterator4 = new URLSearchParams().entries();
+  assert_equals(Object.getPrototypeOf(iterator1), Object.getPrototypeOf(iterator2));
+  assert_equals(Object.getPrototypeOf(iterator1), Object.getPrototypeOf(iterator3));
+  assert_equals(Object.getPrototypeOf(iterator1), Object.getPrototypeOf(iterator4));
+}, "Default iterator objects for an interface have the same prototype");
+
+test(() => {
+  const iterator = new URLSearchParams().entries();
+  assert_equals(Object.prototype.toString.call(iterator), "[object URLSearchParams Iterator]");
+}, "Object.prototype.toString returns correct value");
+
+test(() => {
+  const iterator = new URLSearchParams().entries();
+  assert_equals(iterator[Symbol.toStringTag], "URLSearchParams Iterator");
+  assert_equals(Object.getOwnPropertyDescriptor(iterator, Symbol.toStringTag), undefined);
+}, "@@toStringTag has correct value from prototype");
+</script>
diff --git a/WebIDL/ecmascript-binding/iterator-prototype-object.html b/WebIDL/ecmascript-binding/iterator-prototype-object.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Iterator prototype objects</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(() => {
+  const esIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()));
+  const iteratorProto = Object.getPrototypeOf(new URLSearchParams().entries());
+  assert_equals(Object.getPrototypeOf(iteratorProto), esIteratorPrototype);
+}, "Has %IteratorPrototype% as prototype");
+
+test(() => {
+  const iteratorProto = Object.getPrototypeOf(new URLSearchParams().entries());
+  const desc = Object.getOwnPropertyDescriptor(iteratorProto, "next");
+  assert_equals(typeof desc.value, "function");
+  assert_equals(desc.writable, true);
+  assert_equals(desc.enumerable, true);
+  assert_equals(desc.configurable, true);
+}, "next() exists and is writable, enumerable, and configurable");
+
+test(() => {
+  const usp = new URLSearchParams();
+  const iteratorProto = Object.getPrototypeOf(usp.entries());
+
+  assert_throws(new TypeError(), () => {
+    iteratorProto.next();
+  });
+  assert_throws(new TypeError(), () => {
+    iteratorProto.next.call(undefined);
+  });
+  assert_throws(new TypeError(), () => {
+    iteratorProto.next.call(42);
+  });
+  assert_throws(new TypeError(), () => {
+    iteratorProto.next.call(new Headers().entries());
+  });
+}, "next() throws TypeError when called on ineligible receiver");
+
+test(() => {
+  const iteratorProto = Object.getPrototypeOf(new URLSearchParams().entries());
+  assert_equals(Object.prototype.toString.call(iteratorProto), "[object URLSearchParams Iterator]");
+}, "Object.prototype.toString returns correct value");
+
+test(() => {
+  const iteratorProto = Object.getPrototypeOf(new URLSearchParams().entries());
+  assert_equals(Object.getOwnPropertyDescriptor(iteratorProto, Symbol.toStringTag).value, "URLSearchParams Iterator");
+  // Property attributes have not yet been fully spec'd.
+}, "@@toStringTag has correct value");
+
+test(() => {
+  const iteratorProto1 = Object.getPrototypeOf(new URLSearchParams().entries());
+  const iteratorProto2 = Object.getPrototypeOf(new Headers().entries());
+  assert_not_equals(iteratorProto1, iteratorProto2);
+}, "Is specific to an interface");
+</script>