From 2bb0252ab48a97a72c33cef9cbe54e86563f15c9 Mon Sep 17 00:00:00 2001
From: janekptacijarabaci <janekptacijarabaci@seznam.cz>
Date: Sat, 24 Mar 2018 12:23:14 +0100
Subject: Bug 1147371: Implement IteratorClose for array destructuring

Issue #74
---
 .../ecma_6/Destructuring/array-iterator-close.js   | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 js/src/tests/ecma_6/Destructuring/array-iterator-close.js

(limited to 'js/src/tests')

diff --git a/js/src/tests/ecma_6/Destructuring/array-iterator-close.js b/js/src/tests/ecma_6/Destructuring/array-iterator-close.js
new file mode 100644
index 000000000..f7805540d
--- /dev/null
+++ b/js/src/tests/ecma_6/Destructuring/array-iterator-close.js
@@ -0,0 +1,77 @@
+// Tests that IteratorClose is called in array destructuring patterns.
+
+function test() {
+    var returnCalled = 0;
+    var returnCalledExpected = 0;
+    var iterable = {};
+
+    // empty [] calls IteratorClose regardless of "done" on the result.
+    iterable[Symbol.iterator] = makeIterator({
+        next: function() {
+            return { done: true };
+        },
+        ret: function() {
+            returnCalled++;
+            return {};
+        }
+    });
+    var [] = iterable;
+    assertEq(returnCalled, ++returnCalledExpected);
+
+    iterable[Symbol.iterator] = makeIterator({
+        ret: function() {
+            returnCalled++;
+            return {};
+        }
+    });
+    var [] = iterable;
+    assertEq(returnCalled, ++returnCalledExpected);
+
+    // Non-empty destructuring calls IteratorClose if iterator is not done by
+    // the end of destructuring.
+    var [a,b] = iterable;
+    assertEq(returnCalled, ++returnCalledExpected);
+    var [c,] = iterable;
+    assertEq(returnCalled, ++returnCalledExpected);
+
+    // throw in lhs ref calls IteratorClose
+    function throwlhs() {
+        throw "in lhs";
+    }
+    assertThrowsValue(function() {
+        0, [...{}[throwlhs()]] = iterable;
+    }, "in lhs");
+    assertEq(returnCalled, ++returnCalledExpected);
+
+    // throw in iter.next doesn't call IteratorClose
+    iterable[Symbol.iterator] = makeIterator({
+        next: function() {
+            throw "in next";
+        },
+        ret: function() {
+            returnCalled++;
+            return {};
+        }
+    });
+    assertThrowsValue(function() {
+        var [d] = iterable;
+    }, "in next");
+    assertEq(returnCalled, returnCalledExpected);
+
+    // "return" must return an Object.
+    iterable[Symbol.iterator] = makeIterator({
+        ret: function() {
+            returnCalled++;
+            return 42;
+        }
+    });
+    assertThrowsInstanceOf(function() {
+        var [] = iterable;
+    }, TypeError);
+    assertEq(returnCalled, ++returnCalledExpected);
+}
+
+test();
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
-- 
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