test/nashorn/script/basic/JDK-8141407.js

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
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 * published by the Free Software Foundation.
 * 
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * 
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/**
 * JDK-8141407: Wrong evaluation of a != a when a = NaN
 *
 * @test
 * @run
 */

function expectNotEqualToSelf(a) {
    Assert.assertFalse(a == a);
    Assert.assertFalse(a === a);
    Assert.assertTrue(a != a);
    Assert.assertTrue(a !== a);
}

// In previous versions of Nashorn this failed only on the second assignment,
// because only then the property slot was widened to object.
var a = NaN;
expectNotEqualToSelf(a);
a = {};
a = NaN;
expectNotEqualToSelf(a);

// We do have to do value-based rather than reference-based comparison for
// java.lang.Double since that class is used to represent primitive numbers
// in JavaScript.
var b = new java.lang.Double(NaN);
expectNotEqualToSelf(b);
b = {};
b = new java.lang.Double(NaN);
expectNotEqualToSelf(b);

// Although float is not used internally by Nashorn, java.lang.Float
// is handled like a primitive number in most of Nashorn, so for consistency
// we treat it like java.lang.Double.
var c = new java.lang.Float(NaN);
expectNotEqualToSelf(c);
c = {};
c = new java.lang.Float(NaN);
expectNotEqualToSelf(c);