Add initial plugin implementation and development setup

dev/int.spec.ts

@@ -0,0 +1,52 @@
+import type { Payload } from 'payload'
+
+import config from '@payload-config'
+import { createPayloadRequest, getPayload } from 'payload'
+import { afterAll, beforeAll, describe, expect, test } from 'vitest'
+
+import { customEndpointHandler } from '../src/endpoints/customEndpointHandler.js'
+
+let payload: Payload
+
+afterAll(async () => {
+  await payload.destroy()
+})
+
+beforeAll(async () => {
+  payload = await getPayload({ config })
+})
+
+describe('Plugin integration tests', () => {
+  test('should query custom endpoint added by plugin', async () => {
+    const request = new Request('http://localhost:3000/api/my-plugin-endpoint', {
+      method: 'GET',
+    })
+
+    const payloadRequest = await createPayloadRequest({ config, request })
+    const response = await customEndpointHandler(payloadRequest)
+    expect(response.status).toBe(200)
+
+    const data = await response.json()
+    expect(data).toMatchObject({
+      message: 'Hello from custom endpoint',
+    })
+  })
+
+  test('can create post with custom text field added by plugin', async () => {
+    const post = await payload.create({
+      collection: 'posts',
+      data: {
+        addedByPlugin: 'added by plugin',
+      },
+    })
+    expect(post.addedByPlugin).toBe('added by plugin')
+  })
+
+  test('plugin creates and seeds plugin-collection', async () => {
+    expect(payload.collections['plugin-collection']).toBeDefined()
+
+    const { docs } = await payload.find({ collection: 'plugin-collection' })
+
+    expect(docs).toHaveLength(1)
+  })
+})