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23
24description("Test to ensure correct behaviour of prototype caching with dictionary prototypes");
25
26function protoTest(o) {
27    return o.protoProp;
28}
29
30var proto = {protoProp: "PASS", propToRemove: "foo"};
31var o = { __proto__: proto };
32
33delete proto.propToRemove;
34
35// Prototype lookup caching will attempt to convert proto back to an ordinary structure
36protoTest(o);
37protoTest(o);
38protoTest(o);
39shouldBe("protoTest(o)", "'PASS'");
40delete proto.protoProp;
41proto.fakeProtoProp = "FAIL";
42shouldBeUndefined("protoTest(o)");
43
44function protoTest2(o) {
45    return o.b;
46}
47
48var proto = {a:1, b:"meh", c:2};
49var o = { __proto__: proto };
50
51delete proto.b;
52proto.d = 3;
53protoTest2(o);
54protoTest2(o);
55protoTest2(o);
56var protoKeys = [];
57for (var i in proto)
58    protoKeys.push(proto[i]);
59
60shouldBe("protoKeys", "[1,2,3]");
61
62function protoTest3(o) {
63    return o.b;
64}
65
66var proto = {a:1, b:"meh", c:2};
67var o = { __proto__: proto };
68
69delete proto.b;
70protoTest2(o);
71protoTest2(o);
72protoTest2(o);
73proto.d = 3;
74var protoKeys = [];
75for (var i in proto)
76    protoKeys.push(proto[i]);
77
78shouldBe("protoKeys", "[1,2,3]");
79
80function testFunction(o) {
81    return o.test;
82}
83
84var proto = { test: true };
85var subclass1 = { __proto__: proto };
86var subclass2 = { __proto__: proto };
87for (var i = 0; i < 500; i++)
88    subclass2["a"+i]="a"+i;
89
90testFunction(subclass1);
91shouldBeTrue("testFunction(subclass1)");
92shouldBeTrue("testFunction(subclass2)");
93proto.test = false
94subclass2.test = true;
95shouldBeTrue("testFunction(subclass2)");
96