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require("../common");
var events = require('events');
var callbacks_called = [ ];
var e = new events.EventEmitter();
function callback1() {
callbacks_called.push("callback1");
e.addListener("foo", callback2);
e.addListener("foo", callback3);
e.removeListener("foo", callback1);
}
function callback2() {
callbacks_called.push("callback2");
e.removeListener("foo", callback2);
}
function callback3() {
callbacks_called.push("callback3");
e.removeListener("foo", callback3);
}
e.addListener("foo", callback1);
assert.equal(1, e.listeners("foo").length);
e.emit("foo");
assert.equal(2, e.listeners("foo").length);
assert.deepEqual(["callback1"], callbacks_called);
e.emit("foo");
assert.equal(0, e.listeners("foo").length);
assert.deepEqual(["callback1", "callback2", "callback3"], callbacks_called);
e.emit("foo");
assert.equal(0, e.listeners("foo").length);
assert.deepEqual(["callback1", "callback2", "callback3"], callbacks_called);
e.addListener("foo", callback1);
e.addListener("foo", callback2);
assert.equal(2, e.listeners("foo").length)
e.removeAllListeners("foo")
assert.equal(0, e.listeners("foo").length)
// Verify that removing callbacks while in emit allows emits to propagate to
// all listeners
callbacks_called = [ ];
e.addListener("foo", callback2);
e.addListener("foo", callback3);
assert.equal(2, e.listeners("foo").length)
e.emit("foo");
assert.deepEqual(["callback2", "callback3"], callbacks_called);
assert.equal(0, e.listeners("foo").length)
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