Migrated several tests from blink to V8 repository.

test/webkit/toString-elision-trailing-comma.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  Redistributions in binary form must reproduce the above copyright
+//     notice, this list of conditions and the following disclaimer in the
+//     documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+description(
+"This test checks that toString() round-trip on a function that has a array with elision does not remove a comma."
+);
+
+function f1() {
+    return [,];
+}
+
+function f2() {
+    return [1];
+}
+
+function f3() {
+    return [1,];
+}
+
+// this is the first testcase that proves that trailing
+// elision comma is not removed
+function f4() {
+    return [1,,];
+}
+
+function f5() {
+    return [1,,,];
+}
+function f6() {
+    return [1,,,4];
+}
+
+function f7() {
+    return [,2,];
+}
+
+function f8() {
+    return [,2,,];
+}
+
+function f9() {
+    return [,2,,,5];
+}
+
+function f10() {
+    return [,,3,,,];
+}
+
+function f11() {
+    return [,,3,,,6];
+}
+
+function f12() {
+    return [,undefined];
+}
+
+function f13() {
+    return [,undefined,];
+}
+
+function f14() {
+    return [,undefined,,];
+}
+
+function f15() {
+    return [,,];
+}
+
+function f16() {
+    return [,,,];
+}
+
+shouldBe("typeof undefined", "'undefined'");
+
+unevalf = function(x) { return '(' + x.toString() + ')'; };
+
+function testToStringAndLength(fn, length, lastElement)
+{
+    // check that array length is correct
+    shouldBe(""+ fn +"().length", "" + length);
+
+    // check that last element is what it is supposed to be
+    shouldBe(""+ fn +"()[" + length +"-1]", "" + lastElement);
+
+    // check that toString result evaluates to code that can be evaluated
+    // and that toString doesn't remove the trailing elision comma.
+    shouldBe("unevalf(eval(unevalf("+fn+")))", "unevalf(" + fn + ")");
+
+    // check that toString()ed functions should retain semantics
+
+    shouldBe("eval(unevalf("+fn+"))().length", ""+length);
+    shouldBe("eval(unevalf("+fn+"))()[" + length +"-1]", ""+lastElement);
+}
+
+
+testToStringAndLength("f1", 1);
+testToStringAndLength("f2", 1, 1);
+testToStringAndLength("f3", 1,1);
+testToStringAndLength("f4", 2);
+testToStringAndLength("f5", 3);
+testToStringAndLength("f6", 4, 4);
+testToStringAndLength("f7", 2, 2);
+testToStringAndLength("f8", 3);
+testToStringAndLength("f9", 5, 5);
+testToStringAndLength("f10", 5);
+testToStringAndLength("f11", 6, 6);
+testToStringAndLength("f12", 2);
+testToStringAndLength("f13", 2);
+testToStringAndLength("f14", 3);
+testToStringAndLength("f15", 2);
+testToStringAndLength("f16", 3);