Add IteratorClose tests

test/language/statements/for-of/iterator-close-non-throw-get-method-abrupt.js

@@ -1,10 +1,25 @@
 // Copyright (C) 2015 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-es6id: 13.6.4.13
+esid: sec-iteratorclose
 description: >
-    If retrieving an iterator's `return` method generates an error while
+  If retrieving an iterator's `return` method generates an error while
-    closing the iterator, the error should be forwarded to the runtime.
+  closing the iterator with non-throw completion, the error should be
+  forwarded to the runtime.
+info: |
+  IteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal,
+    [...]
+  6. If completion.[[Type]] is throw, return Completion(completion).
+  7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
 features: [Symbol.iterator]
 ---*/
 

test/language/statements/for-of/iterator-close-non-throw-get-method-non-callable.js

@@ -0,0 +1,47 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-iteratorclose
+description: >
+  If retrieving an iterator's `return` method generates an error while
+  closing the iterator with non-throw completion, the error should be
+  forwarded to the runtime.
+info: |
+  IteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal,
+    [...]
+  6. If completion.[[Type]] is throw, return Completion(completion).
+  7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+  4. If IsCallable(func) is false, throw a TypeError exception.
+features: [Symbol.iterator]
+---*/
+
+var iterable = {};
+var iterationCount = 0;
+
+iterable[Symbol.iterator] = function() {
+  return {
+    next: function() {
+      return { done: false, value: null };
+    },
+    return: 1,
+  };
+};
+
+assert.throws(TypeError, function() {
+  for (var x of iterable) {
+    iterationCount += 1;
+    break;
+  }
+});
+
+assert.sameValue(iterationCount, 1, 'The loop body is evaluated');

test/language/statements/for-of/iterator-close-throw-get-method-abrupt.js

@@ -0,0 +1,46 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-iteratorclose
+description: >
+  If retrieving an iterator's `return` method generates an error while
+  closing the iterator with throw completion, this error should be suppressed.
+info: |
+  IteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal,
+    [...]
+  6. If completion.[[Type]] is throw, return Completion(completion).
+  7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+features: [Symbol.iterator]
+---*/
+
+var iterable = {};
+var iterationCount = 0;
+
+iterable[Symbol.iterator] = function() {
+  return {
+    next: function() {
+      return { done: false, value: null };
+    },
+    get return() {
+      throw { name: 'inner error' };
+    },
+  };
+};
+
+assert.throws(Test262Error, function() {
+  for (var x of iterable) {
+    iterationCount += 1;
+    throw new Test262Error('should not be overriden');
+  }
+});
+
+assert.sameValue(iterationCount, 1, 'The loop body is evaluated');

test/language/statements/for-of/iterator-close-throw-get-method-non-callable.js

@@ -0,0 +1,46 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-iteratorclose
+description: >
+  If retrieving an iterator's `return` method generates an error while
+  closing the iterator with throw completion, this error should be suppressed.
+info: |
+  IteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal,
+    [...]
+  6. If completion.[[Type]] is throw, return Completion(completion).
+  7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+  4. If IsCallable(func) is false, throw a TypeError exception.
+features: [Symbol.iterator]
+---*/
+
+var iterable = {};
+var iterationCount = 0;
+
+iterable[Symbol.iterator] = function() {
+  return {
+    next: function() {
+      return { done: false, value: null };
+    },
+    return: 'str',
+  };
+};
+
+assert.throws(Test262Error, function() {
+  for (var x of iterable) {
+    iterationCount += 1;
+    throw new Test262Error('should not be overriden');
+  }
+});
+
+assert.sameValue(iterationCount, 1, 'The loop body is evaluated');