Mirrors/webamp
1
0
Fork 0
mirror of https://github.com/captbaritone/webamp.git synced 2026-07-20 01:54:01 +00:00
Code Issues Projects Releases Wiki Activity

Test emitter

Browse source
This commit is contained in:
Jordan Eldredge 2018-04-03 06:55:18 -07:00
parent da792c16b9
commit 3d5aeac35b
1 changed files with 53 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

53
js/emitter.test.js Normal file
View file

@ -0,0 +1,53 @@
import Emitter from "./emitter";
describe("Emitter", () => {
it("calls a callback", () => {
const mock = jest.fn();
const emitter = new Emitter();
emitter.on("some-event", mock);
emitter.trigger("some-event");
expect(mock).toHaveBeenCalled();
});
it("calls multiple callbacks", () => {
const mock1 = jest.fn();
const mock2 = jest.fn();
const emitter = new Emitter();
emitter.on("some-event", mock1);
emitter.on("some-event", mock2);
emitter.trigger("some-event");
expect(mock1).toHaveBeenCalled();
expect(mock2).toHaveBeenCalled();
});
it("returns an unsubscribe function", () => {
const mock = jest.fn();
const emitter = new Emitter();
const unsubscribe = emitter.on("some-event", mock);
emitter.trigger("some-event");
unsubscribe();
emitter.trigger("some-event");
emitter.trigger("some-event");
emitter.trigger("some-event");
emitter.trigger("some-event");
emitter.trigger("some-event");
expect(mock).toHaveBeenCalledTimes(1);
});
it("subscriptions do not take effent until the next event", () => {
const mock = jest.fn();
const emitter = new Emitter();
emitter.on("some-event", () => {
emitter.on("some-event", mock);
});
emitter.trigger("some-event");
expect(mock).not.toHaveBeenCalled();
});
it("unsubscribe does not take effect until the next event", () => {
const mock = jest.fn();
const emitter = new Emitter();
emitter.on("some-event", () => {
unsubscribe(); // eslint-disable-line no-use-before-define
});
const unsubscribe = emitter.on("some-event", mock);
emitter.trigger("some-event");
expect(mock).toHaveBeenCalled();
});
});