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comparison: js/src/tests/ecma_6/Generators/runtime.js

js/src/tests/ecma_6/Generators/runtime.js

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1 // This file was written by Andy Wingo <wingo@igalia.com> and originally
2 // contributed to V8 as generators-runtime.js, available here:
3 //
4 // http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-runtime.js
5
6 // Test aspects of the generator runtime.
7
8 // See http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.19.3.
9
10 function assertSyntaxError(str) {
11 assertThrowsInstanceOf(Function(str), SyntaxError);
12 }
13
14
15 function f() { }
16 function* g() { yield 1; }
17 var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
18 var GeneratorFunction = GeneratorFunctionPrototype.constructor;
19 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
20 // FIXME: This should be a symbol.
21 var std_iterator = "@@iterator";
22
23
24 // A generator function should have the same set of properties as any
25 // other function.
26 function TestGeneratorFunctionInstance() {
27 var f_own_property_names = Object.getOwnPropertyNames(f);
28 var g_own_property_names = Object.getOwnPropertyNames(g);
29
30 f_own_property_names.sort();
31 g_own_property_names.sort();
32
33 assertDeepEq(f_own_property_names, g_own_property_names);
34 var i;
35 for (i = 0; i < f_own_property_names.length; i++) {
36 var prop = f_own_property_names[i];
37 var f_desc = Object.getOwnPropertyDescriptor(f, prop);
38 var g_desc = Object.getOwnPropertyDescriptor(g, prop);
39 assertEq(f_desc.configurable, g_desc.configurable, prop);
40 assertEq(f_desc.writable, g_desc.writable, prop);
41 assertEq(f_desc.enumerable, g_desc.enumerable, prop);
42 }
43 }
44 TestGeneratorFunctionInstance();
45
46
47 // Generators have an additional object interposed in the chain between
48 // themselves and Function.prototype.
49 function TestGeneratorFunctionPrototype() {
50 // Sanity check.
51 assertEq(Object.getPrototypeOf(f), Function.prototype);
52 assertNotEq(GeneratorFunctionPrototype, Function.prototype);
53 assertEq(Object.getPrototypeOf(GeneratorFunctionPrototype),
54 Function.prototype);
55 assertEq(Object.getPrototypeOf(function* () {}),
56 GeneratorFunctionPrototype);
57 }
58 TestGeneratorFunctionPrototype();
59
60
61 // Functions that we associate with generator objects are actually defined by
62 // a common prototype.
63 function TestGeneratorObjectPrototype() {
64 assertEq(Object.getPrototypeOf(GeneratorObjectPrototype),
65 Object.prototype);
66 assertEq(Object.getPrototypeOf((function*(){yield 1}).prototype),
67 GeneratorObjectPrototype);
68
69 var expected_property_names = ["next", "throw", "constructor", std_iterator];
70 var found_property_names =
71 Object.getOwnPropertyNames(GeneratorObjectPrototype);
72
73 expected_property_names.sort();
74 found_property_names.sort();
75
76 assertDeepEq(found_property_names, expected_property_names);
77 }
78 TestGeneratorObjectPrototype();
79
80
81 // This tests the object that would be called "GeneratorFunction", if it were
82 // like "Function".
83 function TestGeneratorFunction() {
84 assertEq(GeneratorFunctionPrototype, GeneratorFunction.prototype);
85 assertTrue(g instanceof GeneratorFunction);
86
87 assertEq(Function, Object.getPrototypeOf(GeneratorFunction));
88 assertTrue(g instanceof Function);
89
90 assertEq("function* g() { yield 1; }", g.toString());
91
92 // Not all functions are generators.
93 assertTrue(f instanceof Function); // Sanity check.
94 assertFalse(f instanceof GeneratorFunction);
95
96 assertTrue((new GeneratorFunction()) instanceof GeneratorFunction);
97 assertTrue(GeneratorFunction() instanceof GeneratorFunction);
98
99 assertTrue(GeneratorFunction('yield 1') instanceof GeneratorFunction);
100 assertTrue(GeneratorFunction('return 1') instanceof GeneratorFunction);
101 assertTrue(GeneratorFunction('a', 'yield a') instanceof GeneratorFunction);
102 assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
103 assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
104 assertSyntaxError("GeneratorFunction('yield', 'return yield')");
105 assertTrue(GeneratorFunction('with (x) return foo;') instanceof GeneratorFunction);
106 assertSyntaxError("GeneratorFunction('\"use strict\"; with (x) return foo;')");
107
108 // Doesn't matter particularly what string gets serialized, as long
109 // as it contains "function*" and "yield 10".
110 assertEq(GeneratorFunction('yield 10').toString(),
111 "function* anonymous() {\nyield 10\n}");
112 }
113 TestGeneratorFunction();
114
115
116 function TestPerGeneratorPrototype() {
117 assertNotEq((function*(){}).prototype, (function*(){}).prototype);
118 assertNotEq((function*(){}).prototype, g.prototype);
119 assertEq(typeof GeneratorFunctionPrototype, "object");
120 assertEq(g.prototype.__proto__.constructor, GeneratorFunctionPrototype, "object");
121 assertEq(Object.getPrototypeOf(g.prototype), GeneratorObjectPrototype);
122 assertFalse(g.prototype instanceof Function);
123 assertEq(typeof (g.prototype), "object");
124
125 assertDeepEq(Object.getOwnPropertyNames(g.prototype), []);
126 }
127 TestPerGeneratorPrototype();
128
129
130 if (typeof reportCompare == "function")
131 reportCompare(true, true);

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