v8/test/mjsunit/sum-0-plus-undefined-is-NaN.js

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// Flags: --allow-natives-syntax

/**
 * @fileoverview Test addition of 0 and undefined.
 */

function sum(a, b) {
  return a + b;
};
%PrepareFunctionForOptimization(sum);
function test(x, y, expectNaN) {
  %PrepareFunctionForOptimization(sum);
  for (var i = 0; i < 5; i++) {
    assertEquals(expectNaN, isNaN(sum(x, y)));
  }
  %OptimizeFunctionOnNextCall(sum);
  assertEquals(expectNaN, isNaN(sum(x, y)));
}

test(0, 1, false);
test(0, undefined, true);