v8/test/mjsunit/math-round.js

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assertEquals(0, Math.round(0));
assertEquals(-0, Math.round(-0));
assertEquals(Infinity, Math.round(Infinity));
assertEquals(-Infinity, Math.round(-Infinity));
assertNaN(Math.round(NaN));

assertEquals(1, Math.round(0.5));
assertEquals(1, Math.round(0.7));
assertEquals(1, Math.round(1));
assertEquals(1, Math.round(1.1));
assertEquals(1, Math.round(1.49999));
assertEquals(1/-0, 1/Math.round(-0.5));  // Test for -0 result.
assertEquals(-1, Math.round(-0.5000000000000001));
assertEquals(-1, Math.round(-0.7));
assertEquals(-1, Math.round(-1));
assertEquals(-1, Math.round(-1.1));
assertEquals(-1, Math.round(-1.49999));
assertEquals(-1, Math.round(-1.5));

assertEquals(9007199254740990, Math.round(9007199254740990));
assertEquals(9007199254740991, Math.round(9007199254740991));
assertEquals(-9007199254740990, Math.round(-9007199254740990));
assertEquals(-9007199254740991, Math.round(-9007199254740991));
assertEquals(Number.MAX_VALUE, Math.round(Number.MAX_VALUE));
assertEquals(-Number.MAX_VALUE, Math.round(-Number.MAX_VALUE));

assertEquals(536870911, Math.round(536870910.5));
assertEquals(536870911, Math.round(536870911));
assertEquals(536870911, Math.round(536870911.4));
assertEquals(536870912, Math.round(536870911.5));
assertEquals(536870912, Math.round(536870912));
assertEquals(536870912, Math.round(536870912.4));
assertEquals(536870913, Math.round(536870912.5));
assertEquals(536870913, Math.round(536870913));
assertEquals(536870913, Math.round(536870913.4));
assertEquals(1073741823, Math.round(1073741822.5));
assertEquals(1073741823, Math.round(1073741823));
assertEquals(1073741823, Math.round(1073741823.4));
assertEquals(1073741824, Math.round(1073741823.5));
assertEquals(1073741824, Math.round(1073741824));
assertEquals(1073741824, Math.round(1073741824.4));
assertEquals(1073741825, Math.round(1073741824.5));
assertEquals(2147483647, Math.round(2147483646.5));
assertEquals(2147483647, Math.round(2147483647));
assertEquals(2147483647, Math.round(2147483647.4));
assertEquals(2147483648, Math.round(2147483647.5));
assertEquals(2147483648, Math.round(2147483648));
assertEquals(2147483648, Math.round(2147483648.4));
assertEquals(2147483649, Math.round(2147483648.5));

// Tests based on WebKit LayoutTests

assertEquals(0, Math.round(0.4));
assertEquals(-0, Math.round(-0.4));
assertEquals(-0, Math.round(-0.5));
assertEquals(1, Math.round(0.6));
assertEquals(-1, Math.round(-0.6));
assertEquals(2, Math.round(1.5));
assertEquals(2, Math.round(1.6));
assertEquals(-2, Math.round(-1.6));
assertEquals(8640000000000000, Math.round(8640000000000000));
assertEquals(8640000000000001, Math.round(8640000000000001));
assertEquals(8640000000000002, Math.round(8640000000000002));
assertEquals(9007199254740990, Math.round(9007199254740990));
assertEquals(9007199254740991, Math.round(9007199254740991));
assertEquals(1.7976931348623157e+308, Math.round(1.7976931348623157e+308));
assertEquals(-8640000000000000, Math.round(-8640000000000000));
assertEquals(-8640000000000001, Math.round(-8640000000000001));
assertEquals(-8640000000000002, Math.round(-8640000000000002));
assertEquals(-9007199254740990, Math.round(-9007199254740990));
assertEquals(-9007199254740991, Math.round(-9007199254740991));
assertEquals(-1.7976931348623157e+308, Math.round(-1.7976931348623157e+308));
assertEquals(Infinity, Math.round(Infinity));
assertEquals(-Infinity, Math.round(-Infinity));