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Mini Shell
Mini Shell
// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
function assertMethodDescriptor(object, name) {
var descr = Object.getOwnPropertyDescriptor(object, name);
assertTrue(descr.configurable);
assertFalse(descr.enumerable);
assertTrue(descr.writable);
assertEquals('function', typeof descr.value);
assertFalse('prototype' in descr.value);
assertEquals(name, descr.value.name);
}
function assertAccessorDescriptor(object, name) {
var descr = Object.getOwnPropertyDescriptor(object, name);
assertTrue(descr.configurable);
assertFalse(descr.enumerable);
assertEquals('function', typeof descr.get);
assertEquals('function', typeof descr.set);
assertFalse('prototype' in descr.get);
assertFalse('prototype' in descr.set);
assertEquals("get " + name, descr.get.name);
assertEquals("set " + name, descr.set.name);
}
(function TestProto() {
class C {
__proto__() { return 1; }
}
assertMethodDescriptor(C.prototype, '__proto__');
assertEquals(1, new C().__proto__());
})();
(function TestProtoStatic() {
class C {
static __proto__() { return 1; }
}
assertMethodDescriptor(C, '__proto__');
assertEquals(1, C.__proto__());
})();
(function TestProtoAccessor() {
class C {
get __proto__() { return this._p; }
set __proto__(v) { this._p = v; }
}
assertAccessorDescriptor(C.prototype, '__proto__');
var c = new C();
c._p = 1;
assertEquals(1, c.__proto__);
c.__proto__ = 2;
assertEquals(2, c.__proto__);
})();
(function TestStaticProtoAccessor() {
class C {
static get __proto__() { return this._p; }
static set __proto__(v) { this._p = v; }
}
assertAccessorDescriptor(C, '__proto__');
C._p = 1;
assertEquals(1, C.__proto__);
C.__proto__ = 2;
assertEquals(2, C.__proto__);
})();
(function TestSettersOnProto() {
function Base() {}
Base.prototype = {
set constructor(_) {
assertUnreachable();
},
set m(_) {
assertUnreachable();
}
};
Object.defineProperty(Base, 'staticM', {
set: function() {
assertUnreachable();
}
});
class C extends Base {
m() {
return 1;
}
static staticM() {
return 2;
}
}
assertEquals(1, new C().m());
assertEquals(2, C.staticM());
})();
(function TestConstructableButNoPrototype() {
var Base = function() {}.bind();
assertThrows(function() {
class C extends Base {}
}, TypeError);
})();
(function TestPrototypeGetter() {
var calls = 0;
var Base = function() {}.bind();
Object.defineProperty(Base, 'prototype', {
get: function() {
calls++;
return null;
},
configurable: true
});
class C extends Base {}
assertEquals(1, calls);
calls = 0;
Object.defineProperty(Base, 'prototype', {
get: function() {
calls++;
return 42;
},
configurable: true
});
assertThrows(function() {
class C extends Base {}
}, TypeError);
assertEquals(1, calls);
})();
(function TestPrototypeSetter() {
var Base = function() {}.bind();
Object.defineProperty(Base, 'prototype', {
set: function() {
assertUnreachable();
}
});
assertThrows(function() {
class C extends Base {}
}, TypeError);
})();
Zerion Mini Shell 1.0