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     27 
     28 // Test the ToPrimitive internal function used by ToNumber/ToString.
     29 // Does it [[Get]] and [[Call]] the object's toString and valueOf properties
     30 // correctly. Specifically, does it call [[Get]] only once per property.
     31 
     32 var o1 = { toString: function() { return 42; },
     33            valueOf: function() { return "37"; } };
     34 var n1 = Number(o1);
     35 var s1 = String(o1);
     36 assertTrue(typeof n1 == "number");
     37 assertTrue(typeof s1 == "string");
     38 
     39 var trace = [];
     40 var valueOfValue = 42;
     41 var toStringValue = "foo";
     42 function traceValueOf () {
     43   trace.push("vo");
     44   return valueOfValue;
     45 };
     46 function traceToString() {
     47   trace.push("ts");
     48   return toStringValue;
     49 };
     50 var valueOfFunc = traceValueOf;
     51 var toStringFunc = traceToString;
     52 
     53 var ot = { get toString() { trace.push("gts");
     54                             return toStringFunc; },
     55            get valueOf() { trace.push("gvo");
     56                            return valueOfFunc; }
     57 };
     58 
     59 var nt = Number(ot);
     60 assertEquals(42, nt);
     61 assertEquals(["gvo","vo"], trace);
     62 
     63 trace = [];
     64 var st = String(ot);
     65 assertEquals("foo", st);
     66 assertEquals(["gts","ts"], trace);
     67 
     68 trace = [];
     69 valueOfValue = ["not primitive"];
     70 var nt = Number(ot);
     71 assertEquals(Number("foo"), nt);
     72 assertEquals(["gvo", "vo", "gts", "ts"], trace);
     73 
     74 trace = [];
     75 valueOfValue = 42;
     76 toStringValue = ["not primitive"];
     77 var st = String(ot);
     78 assertEquals(String(42), st);
     79 assertEquals(["gts", "ts", "gvo", "vo"], trace);
     80 
     81 trace = [];
     82 valueOfValue = ["not primitive"];
     83 assertThrows("Number(ot)", TypeError);
     84 assertEquals(["gvo", "vo", "gts", "ts"], trace);
     85 
     86 
     87 toStringFunc = "not callable";
     88 trace = [];
     89 valueOfValue = 42;
     90 var st = String(ot);
     91 assertEquals(String(42), st);
     92 assertEquals(["gts", "gvo", "vo"], trace);
     93 
     94 valueOfFunc = "not callable";
     95 trace = [];
     96 assertThrows("String(ot)", TypeError);
     97 assertEquals(["gts", "gvo"], trace);
     98 
     99 toStringFunc = traceToString;
    100 toStringValue = "87";
    101 trace = [];
    102 var nt = Number(ot);
    103 assertEquals(87, nt);
    104 assertEquals(["gvo", "gts", "ts"], trace);
    105