function-call.js - mozsearch

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

 * Contributor:

 *   Jeff Walden <jwalden+code@mit.edu>

*/

//-----------------------------------------------------------------------------

var BUGNUMBER = 575535;

var summary = 'Function.prototype.call';

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

function expectTypeError(fun, msg)

try

    fun();

    assertEq(true, false, "should have thrown a TypeError");

  catch (e)

    assertEq(e instanceof TypeError, true, msg + "; instead threw " + e);

function fun() { }

var global = this;

assertEq(Function.prototype.call.length, 1);

/* Step 1. */

var nonfuns = [null, 1, -1, 2.5, "[[Call]]", undefined, true, false, {}];

for (var i = 0, sz = nonfuns.length; i < sz; i++)

  var f = function()

    Function.prototype.call.apply(nonfuns[i]);

};

  var msg =

    "expected TypeError calling Function.prototype.call with uncallable this";

  expectTypeError(f, msg);

/* Steps 2-4. */

function none()

  assertEq(this, global, "bad this");

  assertEq(arguments.length, 0, "wrong arguments");

none.call();

none.call(undefined);

none.call(null);

var seenThis;

function strictNone()

  "use strict";

  assertEq(this, seenThis, "bad this");

  assertEq(arguments.length, 0, "wrong arguments");

seenThis = undefined;

strictNone.call();

strictNone.call(undefined);

seenThis = null;

strictNone.call(null);

seenThis = 17;

strictNone.call(17);

var seenThisBox, args;

function some()

  assertEq(this instanceof seenThisBox, true,

           "this not instanceof " + seenThisBox);

  assertEq(this.valueOf(), seenThis,

           "wrong this valueOf()");

  assertEq(arguments.length, args.length, "wrong arguments count");

  for (var i = 0; i < args.length; i++)

    assertEq(arguments[i], args[i], "wrong argument " + i);

seenThis = false;

seenThisBox = Boolean;

args = [8, 6, 7, NaN, undefined, 0.3];

some.call(false, 8, 6, 7, NaN, undefined, 0.3);

var obj = {};

seenThis = "foo";

seenThisBox = String;

args = [obj];

some.call("foo", obj);

seenThis = obj;

seenThisBox = Object;

some.call(obj, obj);

function strictSome()

  "use strict";

  assertEq(this, seenThis, "wrong this");

  assertEq(arguments.length, args.length, "wrong arguments count");

  for (var i = 0; i < args.length; i++)

    assertEq(arguments[i], args[i], "wrong argument " + i);

seenThis = NaN;

args = [8, 6, 7, NaN, undefined, 0.3];

strictSome.call(NaN, 8, 6, 7, NaN, undefined, 0.3);

seenThis = "foo";

args = [obj];

strictSome.call("foo", obj);

seenThis = obj;

strictSome.call(obj, obj);

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");