Jakob Wennberg
112 lines
3.1 KiB
TypeScript
112 lines
3.1 KiB
TypeScript
import { describe, it, expect, beforeEach, vi } from 'vitest'
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import { eventBus } from '../bus'
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import type { JournalEntry } from '@/types'
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const fakeEntry = { id: 'e1' } as JournalEntry
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beforeEach(() => {
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eventBus.clear()
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})
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describe('EventBus', () => {
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it('on() subscribes a handler and returns an unsubscribe function', () => {
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const handler = vi.fn()
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const unsub = eventBus.on('journal_entry.drafted', handler)
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expect(typeof unsub).toBe('function')
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})
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it('emit() calls all handlers for that event type', async () => {
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const handler1 = vi.fn()
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const handler2 = vi.fn()
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eventBus.on('journal_entry.committed', handler1)
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eventBus.on('journal_entry.committed', handler2)
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await eventBus.emit({
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type: 'journal_entry.committed',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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expect(handler1).toHaveBeenCalledWith({ entry: fakeEntry, userId: 'u1' })
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expect(handler2).toHaveBeenCalledWith({ entry: fakeEntry, userId: 'u1' })
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})
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it('emit() uses Promise.allSettled — a failing handler does not crash others', async () => {
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const failingHandler = vi.fn().mockRejectedValue(new Error('boom'))
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const goodHandler = vi.fn()
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eventBus.on('journal_entry.committed', failingHandler)
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eventBus.on('journal_entry.committed', goodHandler)
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// Should not throw
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await eventBus.emit({
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type: 'journal_entry.committed',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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expect(failingHandler).toHaveBeenCalled()
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expect(goodHandler).toHaveBeenCalled()
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})
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it('emit() with no handlers is a no-op', async () => {
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// Should not throw
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await eventBus.emit({
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type: 'journal_entry.drafted',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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})
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it('unsubscribe removes the handler, future emits do not call it', async () => {
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const handler = vi.fn()
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const unsub = eventBus.on('journal_entry.committed', handler)
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unsub()
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await eventBus.emit({
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type: 'journal_entry.committed',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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expect(handler).not.toHaveBeenCalled()
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})
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it('clear() removes all handlers', async () => {
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const handler1 = vi.fn()
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const handler2 = vi.fn()
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eventBus.on('journal_entry.committed', handler1)
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eventBus.on('journal_entry.drafted', handler2)
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eventBus.clear()
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await eventBus.emit({
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type: 'journal_entry.committed',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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await eventBus.emit({
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type: 'journal_entry.drafted',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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expect(handler1).not.toHaveBeenCalled()
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expect(handler2).not.toHaveBeenCalled()
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})
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it('handlers for different event types do not interfere', async () => {
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const committedHandler = vi.fn()
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const draftedHandler = vi.fn()
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eventBus.on('journal_entry.committed', committedHandler)
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eventBus.on('journal_entry.drafted', draftedHandler)
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await eventBus.emit({
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type: 'journal_entry.committed',
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payload: { entry: fakeEntry, userId: 'u1' },
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})
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expect(committedHandler).toHaveBeenCalledOnce()
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expect(draftedHandler).not.toHaveBeenCalled()
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})
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})
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