async-iteration: yield Promise.reject(value) is treated as throw value (rejects)

- http://tc39.github.io/tc39-notes/2017-05_may-25.html#15iva-revisiting-async-generator-yield-behavior
- http://tc39.github.io/tc39-notes/2017-05_may-25.html#conclusionresolution-12

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

6 files changed, 180 insertions, 0 deletions

diff --git a/src/async-generators/yield-promise-reject-next-catch.case b/src/async-generators/yield-promise-reject-next-catch.case
new file mode 100644
index 000000000..bc0568133
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next-catch.case
@@ -0,0 +1,27 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield Promise.reject(value) is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+//- body
+yield Promise.reject(error);
+yield "unreachable";
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}).catch(rejectValue => {
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+});
diff --git a/src/async-generators/yield-promise-reject-next-for-await-of-async-iterator.case b/src/async-generators/yield-promise-reject-next-for-await-of-async-iterator.case
new file mode 100644
index 000000000..bca3550a4
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next-for-await-of-async-iterator.case
@@ -0,0 +1,33 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield * [Promise.reject(value)] is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+async function * readFile() {
+  yield Promise.reject(error);
+  yield "unreachable";
+}
+//- body
+for await (let line of readFile()) {
+  yield line;
+}
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}, rejectValue => {
+
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-promise-reject-next-for-await-of-sync-iterator.case b/src/async-generators/yield-promise-reject-next-for-await-of-sync-iterator.case
new file mode 100644
index 000000000..19774b094
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next-for-await-of-sync-iterator.case
@@ -0,0 +1,32 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield Promise.reject(value) in for-await-of is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+let iterable = [
+  Promise.reject(error),
+  "unreachable"
+];
+//- body
+for await (let value of iterable) {
+  yield value;
+}
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}, rejectValue => {
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-promise-reject-next-yield-star-async-iterator.case b/src/async-generators/yield-promise-reject-next-yield-star-async-iterator.case
new file mode 100644
index 000000000..5239f6068
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next-yield-star-async-iterator.case
@@ -0,0 +1,31 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield * (async iterator) is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+async function * readFile() {
+  yield Promise.reject(error);
+  yield "unreachable";
+}
+//- body
+yield * readFile();
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}, rejectValue => {
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+}).then($DONE, $DONE);
diff --git a/src/async-generators/yield-promise-reject-next-yield-star-sync-iterator.case b/src/async-generators/yield-promise-reject-next-yield-star-sync-iterator.case
new file mode 100644
index 000000000..36fb4da67
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next-yield-star-sync-iterator.case
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield * (async iterator) is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+let iterable = [
+  Promise.reject(error),
+  "unreachable"
+];
+//- body
+yield * iterable;
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}, rejectValue => {
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-promise-reject-next.case b/src/async-generators/yield-promise-reject-next.case
new file mode 100644
index 000000000..09a1eba75
--- /dev/null
+++ b/src/async-generators/yield-promise-reject-next.case
@@ -0,0 +1,27 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: yield Promise.reject(value) is treated as throw value
+template: default
+flags: [async]
+---*/
+
+//- setup
+let error = new Error();
+//- body
+yield Promise.reject(error);
+yield "unreachable";
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error("Promise incorrectly resolved.");
+}, rejectValue => {
+  // yield Promise.reject(error);
+  assert.sameValue(rejectValue, error);
+
+  iter.next().then(({done, value}) => {
+    // iter is closed now.
+    assert.sameValue(done, true, "The value of IteratorResult.done is `true`");
+    assert.sameValue(value, undefined, "The value of IteratorResult.value is `undefined`");
+  }).then($DONE, $DONE);
+}).catch($DONE);