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(function() {   // Function wrapper to keep the environment clean.

/*
 * poor man's JS test suite
 */
var testctx = {};

function initTestContext(name)
{
    testctx.nr = 1;
    testctx.name = name;
}

function verify(c)
{
    if (!c)
        throw testctx.name + ": verification #" + testctx.nr + " failed.";
    testctx.nr++;
}


/*
 * Tests for extensions of JavaScript builtin types.
 */

var a = ["one", "two", "three"];
initTestContext("Array.prototype.contains");
for (var k in a)
    verify(k !== "contains");
verify(a.contains("one"));
verify(a.contains("two"));
verify(a.contains("three"));
verify(!a.contains("four"));

})()            // END function wrapper