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index.unit.test.js
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index.unit.test.js
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const { MessageQueue } = require('.')
const SqsClient = require('./sqs-client')
jest.mock('./sqs-client')
beforeEach(() => {
// Clear all instances and calls to constructor and all methods:
SqsClient.mockClear();
});
describe('Publish', () => {
test('Publish is called once', async () => {
const messageQueue = new MessageQueue('sqs')
await messageQueue.publish('hello world', {})
expect(messageQueue.client.publish).toHaveBeenCalledTimes(1)
})
test('Payload is published', async () => {
const topicPrefix = 'core'
const messageQueue = new MessageQueue('sqs', { topicPrefix })
const payload = { x: 5, y: 'strawberries' }
await messageQueue.publish('eat', payload)
expect(messageQueue.client.publish.mock.calls[0][1]).toEqual(payload)
})
test('Topic prefix is configurable', async () => {
const topicPrefix = 'core'
const messageQueue = new MessageQueue('sqs', { topicPrefix })
const eventName = 'eat'
const payload = { x: 5, y: 'strawberries' }
await messageQueue.publish(eventName, payload)
expect(messageQueue.client.publish.mock.calls[0][0]).toBe(`${topicPrefix}-${eventName}`)
})
})
describe('Subscribe', () => {
test('Handler is called once', () => {
const messageQueue = new MessageQueue('sqs')
const messageHandler = jest.fn((message) => Promise.resolve(true))
messageQueue.client.subscribe = (queueName, handler) => {
handler({ x: 'Hello', y: 47 })
}
messageQueue.subscribe('hello', messageHandler)
expect(messageHandler).toHaveBeenCalledTimes(1)
})
})