Source code
Revision control
Copy as Markdown
Other Tools
Test Info: Warnings
- This test gets skipped with pattern: os == 'android'
- Manifest: devtools/shared/tests/xpcshell/xpcshell.toml
/* Any copyright is dedicated to the Public Domain.
"use strict";
const {
ConsoleAPIListener,
const {
on,
once,
off,
emit,
count,
handler,
const pass = message => ok(true, message);
const fail = message => ok(false, message);
/**
* Each method of this object is a test; tests can be synchronous or asynchronous:
*
* 1. Plain method are synchronous tests.
* 2. methods with `async` keyword are asynchronous tests.
* 3. methods with `done` as argument are asynchronous tests (`done` needs to be called to
* complete the test).
*/
const TESTS = {
testAddListener() {
const events = [{ name: "event#1" }, "event#2"];
const target = { name: "target" };
on(target, "message", function (message) {
equal(this, target, "this is a target object");
equal(message, events.shift(), "message is emitted event");
});
emit(target, "message", events[0]);
emit(target, "message", events[0]);
},
testListenerIsUniquePerType() {
const actual = [];
const target = {};
listener = () => actual.push(1);
on(target, "message", listener);
on(target, "message", listener);
on(target, "message", listener);
on(target, "foo", listener);
on(target, "foo", listener);
emit(target, "message");
deepEqual([1], actual, "only one message listener added");
emit(target, "foo");
deepEqual([1, 1], actual, "same listener added for other event");
},
testEventTypeMatters() {
const target = { name: "target" };
on(target, "message", () => fail("no event is expected"));
on(target, "done", () => pass("event is emitted"));
emit(target, "foo");
emit(target, "done");
},
testAllArgumentsArePassed() {
const foo = { name: "foo" },
bar = "bar";
const target = { name: "target" };
on(target, "message", (a, b) => {
equal(a, foo, "first argument passed");
equal(b, bar, "second argument passed");
});
emit(target, "message", foo, bar);
},
testNoSideEffectsInEmit() {
const target = { name: "target" };
on(target, "message", () => {
pass("first listener is called");
on(target, "message", () => fail("second listener is called"));
});
emit(target, "message");
},
testCanRemoveNextListener() {
const target = { name: "target" };
on(target, "data", () => {
pass("first listener called");
off(target, "data", fail);
});
on(target, "data", fail);
emit(target, "data", "Listener should be removed");
},
testOrderOfPropagation() {
const actual = [];
const target = { name: "target" };
on(target, "message", () => actual.push(1));
on(target, "message", () => actual.push(2));
on(target, "message", () => actual.push(3));
emit(target, "message");
deepEqual([1, 2, 3], actual, "called in order they were added");
},
testRemoveListener() {
const target = { name: "target" };
const actual = [];
on(target, "message", function listener() {
actual.push(1);
on(target, "message", () => {
off(target, "message", listener);
actual.push(2);
});
});
emit(target, "message");
deepEqual([1], actual, "first listener called");
emit(target, "message");
deepEqual([1, 1, 2], actual, "second listener called");
emit(target, "message");
deepEqual([1, 1, 2, 2, 2], actual, "first listener removed");
},
testRemoveAllListenersForType() {
const actual = [];
const target = { name: "target" };
on(target, "message", () => actual.push(1));
on(target, "message", () => actual.push(2));
on(target, "message", () => actual.push(3));
on(target, "bar", () => actual.push("b"));
off(target, "message");
emit(target, "message");
emit(target, "bar");
deepEqual(["b"], actual, "all message listeners were removed");
},
testRemoveAllListeners() {
const actual = [];
const target = { name: "target" };
on(target, "message", () => actual.push(1));
on(target, "message", () => actual.push(2));
on(target, "message", () => actual.push(3));
on(target, "bar", () => actual.push("b"));
off(target);
emit(target, "message");
emit(target, "bar");
deepEqual([], actual, "all listeners events were removed");
},
testFalsyArgumentsAreFine() {
let type, listener;
const target = { name: "target" },
actual = [];
on(target, "bar", () => actual.push(0));
off(target, "bar", listener);
emit(target, "bar");
deepEqual([0], actual, "3rd bad arg will keep listener");
off(target, type);
emit(target, "bar");
deepEqual([0, 0], actual, "2nd bad arg will keep listener");
off(target, type, listener);
emit(target, "bar");
deepEqual([0, 0, 0], actual, "2nd & 3rd bad args will keep listener");
},
testUnhandledExceptions(done) {
const listener = new ConsoleAPIListener(null, message => {
equal(message.level, "error", "Got the first exception");
equal(
message.arguments[0].message,
"Boom!",
"unhandled exception is logged"
);
listener.destroy();
done();
});
listener.init();
const target = {};
on(target, "message", () => {
throw Error("Boom!");
});
emit(target, "message");
},
testCount() {
const target = { name: "target" };
equal(count(target, "foo"), 0, "no listeners for 'foo' events");
on(target, "foo", () => {});
equal(count(target, "foo"), 1, "listener registered");
on(target, "foo", () => {});
equal(count(target, "foo"), 2, "another listener registered");
off(target);
equal(count(target, "foo"), 0, "listeners unregistered");
},
async testOnce() {
const target = { name: "target" };
const called = false;
const pFoo = once(target, "foo", function (value) {
ok(!called, "listener called only once");
equal(value, "bar", "correct argument was passed");
equal(this, target, "the contextual object is correct");
});
const pDone = once(target, "done");
emit(target, "foo", "bar");
emit(target, "foo", "baz");
emit(target, "done", "");
await Promise.all([pFoo, pDone]);
},
testRemovingOnce(done) {
const target = { name: "target" };
once(target, "foo", fail);
once(target, "done", done);
off(target, "foo", fail);
emit(target, "foo", "listener was called");
emit(target, "done", "");
},
testAddListenerWithHandlerMethod() {
const target = { name: "target" };
const actual = [];
const listener = function (...args) {
equal(
this,
target,
"the contextual object is correct for function listener"
);
deepEqual(args, [10, 20, 30], "arguments are properly passed");
};
const object = {
name: "target",
[handler](type, ...rest) {
actual.push(type);
equal(
this,
object,
"the contextual object is correct for object listener"
);
deepEqual(rest, [10, 20, 30], "arguments are properly passed");
},
};
on(target, "foo", listener);
on(target, "bar", object);
on(target, "baz", object);
emit(target, "foo", 10, 20, 30);
emit(target, "bar", 10, 20, 30);
emit(target, "baz", 10, 20, 30);
deepEqual(
actual,
["bar", "baz"],
"object's listener called in the expected order"
);
},
testRemoveListenerWithHandlerMethod() {
const target = {};
const actual = [];
const object = {
[handler]() {
actual.push(1);
on(target, "message", () => {
off(target, "message", object);
actual.push(2);
});
},
};
on(target, "message", object);
emit(target, "message");
deepEqual([1], actual, "first listener called");
emit(target, "message");
deepEqual([1, 1, 2], actual, "second listener called");
emit(target, "message");
deepEqual([1, 1, 2, 2, 2], actual, "first listener removed");
},
async testOnceListenerWithHandlerMethod() {
const target = { name: "target" };
const called = false;
const object = {
[handler](type, value) {
ok(!called, "listener called only once");
equal(type, "foo", "event type is properly passed");
equal(value, "bar", "correct argument was passed");
equal(
this,
object,
"the contextual object is correct for object listener"
);
},
};
const pFoo = once(target, "foo", object);
const pDone = once(target, "done");
emit(target, "foo", "bar");
emit(target, "foo", "baz");
emit(target, "done", "");
await Promise.all([pFoo, pDone]);
},
testCallingOffWithMoreThan3Args() {
const target = { name: "target" };
on(target, "data", fail);
off(target, "data", fail, undefined);
emit(target, "data", "Listener should be removed");
},
};
/**
* Create a runnable tests based on the tests descriptor given.
*
* @param {Object} tests
* The tests descriptor object, contains the tests to run.
*/
const runnable = tests =>
async function () {
for (const name of Object.keys(tests)) {
info(name);
if (tests[name].length === 1) {
await new Promise(resolve => tests[name](resolve));
} else {
await tests[name]();
}
}
};
add_task(runnable(TESTS));