diff --git a/src/async-generators/yield-star-expr-abrupt.case b/src/async-generators/yield-star-expr-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..905b88b0c5e2337ab5473cc74001b363511efbbb
--- /dev/null
+++ b/src/async-generators/yield-star-expr-abrupt.case
@@ -0,0 +1,36 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while getting yield* operand
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    ...
+flags: [async]
+---*/
+
+//- setup
+var obj = {};
+var abrupt = function() {
+  throw obj;
+};
+
+//- body
+  yield* abrupt();
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, obj, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-get-abrupt.case b/src/async-generators/yield-star-getiter-async-get-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..d1e711717343400393d50d97777a79aa21af4535
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-get-abrupt.case
@@ -0,0 +1,59 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while getting [Symbol.asyncIterator]
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  get [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case b/src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..305d7f26cd2a654b16015e1d1c1283b1ba10a9f5
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.asyncIterator] (boolean)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    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.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: false
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-not-callable-number-throw.case b/src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..f228a1526e68e0af3060b6d6dd117c662814b00e
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.asyncIterator] (number)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    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.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: 0
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-not-callable-object-throw.case b/src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..b968bc9f1588346db73abdbf04b83b7c06c41871
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.asyncIterator] (object)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    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.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: {}
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-not-callable-string-throw.case b/src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..f2a05a682c476715fae98c9d919839a27af42846
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.asyncIterator] (string)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    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.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: ''
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case b/src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..67bdece9a1f05b5c1c217987d860e2669eb31e69
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.asyncIterator] (symbol)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    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.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: Symbol.asyncIterator
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case b/src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..66e9c850bd8676df2c0dc2a3ac70d44d3315fd22
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
@@ -0,0 +1,64 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while getting @@iterator after null @@asyncIterator
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return null;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-abrupt.case b/src/async-generators/yield-star-getiter-async-returns-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..cb12840d80650d74b5e3a53b21fd98d75f2c0336
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-abrupt.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while calling [Symbol.asyncIterator]
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-boolean-throw.case b/src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..3a80b2347bd02cedf7b39d43d5333aaefb9995c3
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - boolean
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return true;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-null-throw.case b/src/async-generators/yield-star-getiter-async-returns-null-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..4609d9a8d1ba40213581f748101988800639d67c
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-null-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - null
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return null;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-number-throw.case b/src/async-generators/yield-star-getiter-async-returns-number-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..fea570eddd29494edf95f31c81f0b52114322dd0
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-number-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - number
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return 42;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-string-throw.case b/src/async-generators/yield-star-getiter-async-returns-string-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..b28633e67e05d83722a6528c345c65fee253b875
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-string-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - string
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return '42';
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-symbol-throw.case b/src/async-generators/yield-star-getiter-async-returns-symbol-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..ce720f70ccf220b682fac17a82b2c8706f6fce85
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-symbol-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - symbol
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return Symbol.asyncIterator;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-returns-undefined-throw.case b/src/async-generators/yield-star-getiter-async-returns-undefined-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..97f9c57294807a6c7527ecdd69156992211e0a18
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-returns-undefined-throw.case
@@ -0,0 +1,54 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.asyncIterator]() - undefined
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return undefined;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case b/src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..2812dcdd5c8768bbd77a37f259e11aaf7c6fc729
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
@@ -0,0 +1,64 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while getting @@iterator after undefined @@asyncIterator
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return undefined;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-get-abrupt.case b/src/async-generators/yield-star-getiter-sync-get-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..968d4d3075586ee82c55635359109bd4f5e894ff
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-get-abrupt.case
@@ -0,0 +1,58 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while getting [Symbol.iterator]
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case b/src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..2c0575d9610ccd8a1a17e4cb1d230cb4003ee1be
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case
@@ -0,0 +1,56 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.iterator] (boolean)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]: false
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case b/src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..6146b9ced16312b101c050003def784ba74a6703
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case
@@ -0,0 +1,56 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.iterator] (number)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]: 0
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case b/src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..80a72246af77a248853194ba03af18836029750f
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case
@@ -0,0 +1,56 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.iterator] (object)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]: {}
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case b/src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..357ed9987249d9ed7840086a177d1b190a520cb5
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case
@@ -0,0 +1,56 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.iterator] (string)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]: ''
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case b/src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..f8ac1218fe273381d44e12aa43bff99d4532d6b9
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case
@@ -0,0 +1,57 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Throws a TypeError on a non-callable [Symbol.iterator] (symbol)
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]: Symbol.iterator
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-abrupt.case b/src/async-generators/yield-star-getiter-sync-returns-abrupt.case
new file mode 100644
index 0000000000000000000000000000000000000000..3ae44f9d82aef07db6ef64d65ade293548113343
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-abrupt.case
@@ -0,0 +1,51 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Abrupt completion while calling [Symbol.iterator]
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+    ...
+
+features: [Symbol.asyncIterator]
+flags: [async]
+---*/
+
+//- setup
+var reason = {};
+var obj = {
+  [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case b/src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..ddc7a0fdde2425236dcad8932e8b909c902c1534
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - boolean
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return true;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-null-throw.case b/src/async-generators/yield-star-getiter-sync-returns-null-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..d3ba975ec02fb8f0a0a1b76119270b0010b4c6f3
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-null-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - null
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return null;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-number-throw.case b/src/async-generators/yield-star-getiter-sync-returns-number-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..f41db30cf35211a4f2f8efc15f2f5b85113fa146
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-number-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - number
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return 0;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-string-throw.case b/src/async-generators/yield-star-getiter-sync-returns-string-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..bf26f22c715a9f692a7db905f2dcad07237b0298
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-string-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - string
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return '';
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case b/src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..466f456a980e1816ae9aaded65b4bc06884777d8
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - symbol
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return Symbol.iterator;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
diff --git a/src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case b/src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case
new file mode 100644
index 0000000000000000000000000000000000000000..320fd56a371d8398a8e7f6d0ccb6b55e46f4448f
--- /dev/null
+++ b/src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case
@@ -0,0 +1,55 @@
+// Copyright 2017 Tooru Fujisawa. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: default
+desc: Non object returned by [Symbol.iterator]() - undefined
+info: |
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+flags: [async]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.iterator]() {
+    return undefined;
+  }
+};
+
+//- body
+  yield* obj;
+  throw new Test262Error('abrupt completion closes iter');
+
+//- assertions
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);