mozilla-central/dom/tests/mochitest/bugs/test_instanceof_error_message.html

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<!DOCTYPE HTML>
<html>
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<head>
<meta charset="utf-8">
<title>Test for Bug 1530413</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script type="application/javascript">
add_task(() => {
var Cu = SpecialPowers.Cu;
try {
// Test case 1
({} instanceof {});
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "({}) is not a function", "We should get a correct error message when calling instanceof");
}
// Test case 2
try {
({} instanceof document);
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "document is not a function", "We should get a correct error message when calling instanceof");
}
// Test case 3
try {
({} instanceof new Proxy(document, {}));
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "(new Proxy(...)) is not a function", "We should get a correct error message when calling instanceof");
}
// Test case 4 - Verify invoking instanceof on an object from a different compartment yields the same error
var sandbox = SpecialPowers.unwrap(Cu.Sandbox(this, { sameZoneAs: this, freshCompartment: true, wantXrays: false }));
sandbox.window = window;
sandbox.crossCompartmentObject = {}; // object created in the test compartment
try {
Cu.evalInSandbox("({} instanceof window);", sandbox);
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "window is not a function", "We should get a correct error message when calling instanceof");
}
// Test case 5 - Verify we get the same error when the LHS is an object created in a different compartment
try {
Cu.evalInSandbox("(crossCompartmentObject instanceof window);", sandbox);
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "window is not a function", "We should get a correct error message when calling instanceof");
}
// Test case 6 - Test that we are correctly wrapping the window into sandbox's compartment
window[Symbol.hasInstance] = function(instance) {
instance.window = this;
return true;
}
var x = Cu.evalInSandbox("(crossCompartmentObject instanceof window);", sandbox);
ok(x, "Symbol.hasInstance for window should return true");
is(sandbox.crossCompartmentObject.window, window, "We shouldn't leak the window");
delete window[Symbol.hasInstance];
Cu.nukeSandbox(sandbox);
// Test case 7 - Test instanceof with RHS being a same-origin Xray to a Window
sandbox = SpecialPowers.unwrap(Cu.Sandbox(this, { sameZoneAs: this, freshCompartment: true}));
sandbox.window = window;
sandbox.crossCompartmentObject = {};
window[Symbol.hasInstance] = function(instance) {
instance.window = this;
return true;
}
try {
Cu.evalInSandbox("(crossCompartmentObject instanceof window);", sandbox);
ok(false, "Should throw a type error");
} catch (e) {
is(e.message, "window is not a function",
"We should get a correct error thrown when the RHS of instanceof is an Xray to a Window.");
}
delete window[Symbol.hasInstance];
Cu.nukeSandbox(sandbox);
// Test case 8 - Test instanceof with RHS being a same-origin Xray waiver
sandbox = SpecialPowers.unwrap(Cu.Sandbox(this, { sameZoneAs: this, freshCompartment: true}));
sandbox.window = window;
sandbox.crossCompartmentObject = {};
sandbox.waiveXrays = SpecialPowers.wrapFor(Cu.waiveXrays, sandbox);
window[Symbol.hasInstance] = function(instance) {
instance.window = this;
return true;
}
Cu.evalInSandbox("(crossCompartmentObject instanceof waiveXrays(window));", sandbox);
ok(x, "Symbol.hasInstance for window should return true");
is(sandbox.crossCompartmentObject.window, window,
"The window pointed to by the crossCompartmentObject should be the same as the window in our compartment");
delete window[Symbol.hasInstance];
Cu.nukeSandbox(sandbox);
});
</script>
</head>
<body>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
</pre>
</body>
</html>