Harmony: implement Math.trunc.

test/mjsunit/harmony/math-trunc.js

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 // Flags: --harmony-maths
 
-assertEquals("Infinity", String(1/Math.sign(0)));
-assertEquals("-Infinity", String(1/Math.sign(-0)));
-assertEquals(1, Math.sign(100));
-assertEquals(-1, Math.sign(-199));
-assertEquals(1, Math.sign(100.1));
-assertTrue(isNaN(Math.sign("abc")));
-assertTrue(isNaN(Math.sign({})));
-assertEquals(0, Math.sign([]));
-assertEquals(1, Math.sign([1]));
-assertEquals(-1, Math.sign([-100.1]));
-assertTrue(isNaN(Math.sign([1, 1])));
-assertEquals(1, Math.sign({ toString: function() { return "100"; } }));
-assertEquals(1, Math.sign({ toString: function() { return 100; } }));
-assertEquals(-1, Math.sign({ valueOf: function() { return -1.1; } }));
-assertEquals(-1, Math.sign({ valueOf: function() { return "-1.1"; } }));
-assertEquals(-1, Math.sign(-Infinity));
-assertEquals(1, Math.sign(Infinity));
-assertEquals(-1, Math.sign("-Infinity"));
-assertEquals(1, Math.sign("Infinity"));
+assertEquals("Infinity", String(1/Math.trunc(0)));
+assertEquals("-Infinity", String(1/Math.trunc(-0)));
+assertEquals("Infinity", String(1/Math.trunc(Math.PI/4)));
+assertEquals("-Infinity", String(1/Math.trunc(-Math.sqrt(2)/2)));
+assertEquals(100, Math.trunc(100));
+assertEquals(-199, Math.trunc(-199));
+assertEquals(100, Math.trunc(100.1));
+assertTrue(isNaN(Math.trunc("abc")));
+assertTrue(isNaN(Math.trunc({})));
+assertEquals(0, Math.trunc([]));
+assertEquals(1, Math.trunc([1]));
+assertEquals(-100, Math.trunc([-100.1]));
+assertTrue(isNaN(Math.trunc([1, 1])));
+assertEquals(-100, Math.trunc({ toString: function() { return "-100.3"; } }));
+assertEquals(10, Math.trunc({ toString: function() { return 10.1; } }));
+assertEquals(-1, Math.trunc({ valueOf: function() { return -1.1; } }));
+assertEquals("-Infinity",
+             String(1/Math.trunc({ valueOf: function() { return "-0.1"; } })));
+assertEquals("-Infinity", String(Math.trunc(-Infinity)));
+assertEquals("Infinity", String(Math.trunc(Infinity)));
+assertEquals("-Infinity", String(Math.trunc("-Infinity")));
+assertEquals("Infinity", String(Math.trunc("Infinity")));