test/mjsunit/abs.js

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// Test Math.sin and Math.abs.

assertEquals(1, Math.abs(1));  // Positive SMI.
assertEquals(1, Math.abs(-1));  // Negative SMI.
assertEquals(0.5, Math.abs(0.5));  // Positive double.
assertEquals(0.5, Math.abs(-0.5));  // Negative double.
assertEquals('Infinity', Math.abs(Number('+Infinity').toString()));
assertEquals('Infinity', Math.abs(Number('-Infinity').toString()));
assertEquals('NaN', Math.abs(NaN).toString());
assertEquals('NaN', Math.abs(-NaN).toString());

var minusZero = 1 / (-1 / 0);
function isMinusZero(x) {
  return x === 0 && 1 / x < 0;
}

assertTrue(!isMinusZero(0));
assertTrue(isMinusZero(minusZero));
assertEquals(0, Math.abs(minusZero));
assertTrue(!isMinusZero(Math.abs(minusZero)));
assertTrue(!isMinusZero(Math.abs(0.0)));