Add yield* tests

test/language/expressions/async-generator/yield-star-getiter-async-return-method-is-null.js

@@ -0,0 +1,55 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-generator-function-definitions-runtime-semantics-evaluation
+description: >
+  If iterator's "return" method is `null`,
+  received completion is forwarded to the runtime.
+info: |
+  YieldExpression : yield * AssignmentExpression
+
+  [...]
+  7. Repeat,
+    [...]
+    c. Else,
+      i. Assert: received.[[Type]] is return.
+      ii. Let return be ? GetMethod(iterator, "return").
+      iii. If return is undefined, then
+        [...]
+        2. Return Completion(received).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [Symbol.asyncIterator, async-iteration]
+flags: [async]
+---*/
+
+var returnGets = 0;
+var asyncIterable = {
+  [Symbol.asyncIterator]: function() {
+    return this;
+  },
+  next: function() {
+    return {value: 1, done: false};
+  },
+  get return() {
+    returnGets += 1;
+    return null;
+  },
+};
+
+async function* asyncGenerator() {
+  yield* asyncIterable;
+}
+
+var asyncIterator = asyncGenerator();
+asyncIterator.next().then(function() {
+  asyncIterator.return(2).then(function(result) {
+    assert.sameValue(result.value, 2);
+    assert.sameValue(result.done, true);
+    assert.sameValue(returnGets, 1);
+  }).then($DONE, $DONE);
+}).catch($DONE);

test/language/expressions/async-generator/yield-star-getiter-async-throw-method-is-null.js

@@ -0,0 +1,75 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-generator-function-definitions-runtime-semantics-evaluation
+description: >
+  If iterator's "throw" method is `null`,
+  AsyncIteratorClose is called before rising TypeError.
+info: |
+  YieldExpression : yield * AssignmentExpression
+
+  [...]
+  7. Repeat,
+    [...]
+    b. Else if received.[[Type]] is throw, then
+      i. Let throw be ? GetMethod(iterator, "throw").
+      ii. If throw is not undefined, then
+        [...]
+      iii. Else,
+        [...]
+        3. If generatorKind is async, perform ? AsyncIteratorClose(iteratorRecord, closeCompletion).
+        [...]
+        6. Throw a TypeError exception.
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+
+  AsyncIteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal, then
+    a. Let return be innerResult.[[Value]].
+    b. If return is undefined, return Completion(completion).
+features: [Symbol.asyncIterator, async-iteration]
+flags: [async]
+---*/
+
+var throwGets = 0;
+var returnGets = 0;
+var asyncIterable = {
+  [Symbol.asyncIterator]: function() {
+    return this;
+  },
+  next: function() {
+    return {value: 1, done: false};
+  },
+  get throw() {
+    throwGets += 1;
+    return null;
+  },
+  get return() {
+    returnGets += 1;
+  },
+};
+
+async function* asyncGenerator() {
+  yield* asyncIterable;
+}
+
+var asyncIterator = asyncGenerator();
+asyncIterator.next().then(function() {
+  asyncIterator.throw().then(
+    function(result) {
+      throw new Test262Error("Promise should be rejected, got: " + result.value);
+    },
+    function(err) {
+      assert.sameValue(err.constructor, TypeError);
+      assert.sameValue(throwGets, 1);
+      assert.sameValue(returnGets, 1);
+    },
+  ).then($DONE, $DONE);
+}).catch($DONE);

test/language/expressions/yield/star-return-is-null.js

@@ -0,0 +1,55 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-generator-function-definitions-runtime-semantics-evaluation
+description: >
+  If iterator's "return" method is `null`,
+  received completion is forwarded to the runtime.
+info: |
+  YieldExpression : yield * AssignmentExpression
+
+  [...]
+  7. Repeat,
+    [...]
+    c. Else,
+      i. Assert: received.[[Type]] is return.
+      ii. Let return be ? GetMethod(iterator, "return").
+      iii. If return is undefined, then
+        [...]
+        2. Return Completion(received).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [generators, Symbol.iterator]
+---*/
+
+var returnGets = 0;
+var iterable = {
+  next: function() {
+    return {value: 1, done: false};
+  },
+  get return() {
+    returnGets += 1;
+    return null;
+  },
+};
+
+iterable[Symbol.iterator] = function() {
+  return iterable;
+};
+
+function* generator() {
+  yield* iterable;
+}
+
+var iterator = generator();
+iterator.next();
+
+var result = iterator.return(2);
+assert.sameValue(result.value, 2);
+assert.sameValue(result.done, true);
+
+assert.sameValue(returnGets, 1);

test/language/expressions/yield/star-throw-is-null.js

@@ -0,0 +1,71 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-generator-function-definitions-runtime-semantics-evaluation
+description: >
+  If iterator's "throw" method is `null`,
+  IteratorClose is called before rising TypeError.
+info: |
+  YieldExpression : yield * AssignmentExpression
+
+  [...]
+  7. Repeat,
+    [...]
+    b. Else if received.[[Type]] is throw, then
+      i. Let throw be ? GetMethod(iterator, "throw").
+      ii. If throw is not undefined, then
+        [...]
+      iii. Else,
+        [...]
+        4. Else, perform ? IteratorClose(iteratorRecord, closeCompletion).
+        [...]
+        6. Throw a TypeError exception.
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+
+  IteratorClose ( iteratorRecord, completion )
+
+  [...]
+  4. Let innerResult be GetMethod(iterator, "return").
+  5. If innerResult.[[Type]] is normal, then
+    a. Let return be innerResult.[[Value]].
+    b. If return is undefined, return Completion(completion).
+features: [generators, Symbol.iterator]
+---*/
+
+var throwGets = 0;
+var returnGets = 0;
+var iterable = {
+  next: function() {
+    return {value: 1, done: false};
+  },
+  get throw() {
+    throwGets += 1;
+    return null;
+  },
+  get return() {
+    returnGets += 1;
+  },
+};
+
+iterable[Symbol.iterator] = function() {
+  return iterable;
+};
+
+function* generator() {
+  yield* iterable;
+}
+
+var iterator = generator();
+iterator.next();
+
+assert.throws(TypeError, function() {
+  iterator.throw();
+});
+
+assert.sameValue(throwGets, 1);
+assert.sameValue(returnGets, 1);