react-event-test
Version:
Event-driven alternative to React Context
87 lines • 3.58 kB
JavaScript
import { messages, publish, subscribe } from "../Event.js";
describe("react-event", () => {
it("accepts type and payload", () => {
expect(() => publish("TEST_EVENT")).toThrow();
});
it("subscribes and publishes events", (done) => {
subscribe("TEST_EVENT", (result) => {
expect(result).toMatchObject({ number: 10, string: "blue" });
});
subscribe("TEST_EVENT", (result) => {
expect(result).toMatchObject({ number: 10, string: "blue" });
done();
});
publish("TEST_EVENT", { number: 10, string: "blue" });
});
it("publishes and subscribes events", (done) => {
publish("TEST_EVENT", { number: 10, string: "blue" });
subscribe("TEST_EVENT", (result) => {
expect(result).toMatchObject({ number: 10, string: "blue" });
done();
});
});
it("notifies all subscribers of an event", (done) => {
let receivedByFirstSubscriber = false;
let receivedBySecondSubscriber = false;
const checkDone = () => {
if (receivedByFirstSubscriber && receivedBySecondSubscriber) {
done();
}
};
subscribe("MULTI_SUB_EVENT", (result) => {
expect(result).toMatchObject({ data: "shared" });
receivedByFirstSubscriber = true;
checkDone();
});
subscribe("MULTI_SUB_EVENT", (result) => {
expect(result).toMatchObject({ data: "shared" });
receivedBySecondSubscriber = true;
checkDone();
});
publish("MULTI_SUB_EVENT", { data: "shared" });
});
it("handles events with no subscribers without errors", () => {
expect(() => publish("NO_SUBSCRIBER_EVENT", { data: "none" })).not.toThrow();
});
it("registers the last published event to map", () => {
publish("LAST_EVENT", { data: "test payload" });
const lastPublishedEvent = messages.get("LAST_EVENT");
expect(lastPublishedEvent).toEqual({ data: "test payload" });
});
it("returns registry in callback", (done) => {
publish("CALLBACK_REGISTRY_EVENT", { data: "test payload" });
subscribe("CALLBACK_REGISTRY_EVENT", (result, registry) => {
expect(result).toMatchObject({ data: "test payload" });
expect(registry).toMatchObject({
id: expect.any(String),
type: "CALLBACK_REGISTRY_EVENT",
callback: expect.any(Function),
unsubscribe: expect.any(Function),
});
registry.unsubscribe();
});
subscribe("CALLBACK_REGISTRY_EVENT_2", (result, registry) => {
expect(result).toMatchObject({ data: "test payload 2" });
expect(registry).toMatchObject({
id: expect.any(String),
type: "CALLBACK_REGISTRY_EVENT_2",
callback: expect.any(Function),
unsubscribe: expect.any(Function),
});
registry.unsubscribe();
done();
});
publish("CALLBACK_REGISTRY_EVENT_2", { data: "test payload 2" });
});
it("supports namespaced events", (done) => {
subscribe("NAMESPACE_1", "NAMESPACE_2", "TEST_EVENT", (result) => {
expect(result).toMatchObject({ number: 10, string: "blue" });
done();
});
publish("NAMESPACE_1", "NAMESPACE_2", "TEST_EVENT", {
number: 10,
string: "blue",
});
});
});
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