feat: add automatic tests

Author: JoseRFelix

jest.config.js

@@ -0,0 +1,7 @@
+module.exports = {
+  roots: ['<rootDir>/src'],
+  testMatch: ['**/__tests__/**/*.+(ts|tsx|js)', '**/?(*.)+(spec|test).+(ts|tsx|js)'],
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest',
+  },
+}

package.json

@@ -30,18 +30,23 @@
     "dev:test-app": "cd test-app && yarn dev",
     "dev": "yarn watch & yarn dev:test-app",
     "build": "rimraf ./dist && tsc",
-    "stable": "dripip stable"
+    "stable": "dripip stable",
+    "test": "jest",
+    "test:watch": "jest --watch"
   },
   "dependencies": {},
   "devDependencies": {
     "@prisma-labs/prettier-config": "0.1.0",
+    "@types/jest": "^26.0.15",
     "@types/webpack": "4.41.22",
     "dripip": "0.10.0",
     "eslint": "7.10.0",
     "eslint-config-prettier": "6.12.0",
+    "jest": "^26.6.0",
     "prettier": "2.1.2",
     "prettier-eslint": "11.0.0",
     "rimraf": "^3.0.2",
+    "ts-jest": "^26.4.1",
     "typescript": "4.0.3",
     "webpack": "4.44.2"
   },

src/__tests__/index.test.ts

@@ -0,0 +1,24 @@
+import withPrismaPlugin from '../index'
+
+describe('withPrismaPlugin', () => {
+  it('should keep nextConfig object properties in other phases', () => {
+    const nextConfig = { foo: 'bar' }
+
+    const newConfig = withPrismaPlugin(nextConfig)('NO_PHASE', {})
+    expect(newConfig).toEqual(nextConfig)
+  })
+
+  it('should call nextConfig function in other phases', () => {
+    const nextConfig = () => ({ foo: 'bar' })
+
+    const newConfig = withPrismaPlugin(nextConfig)('NO_PHASE', {})
+    expect(newConfig).toEqual(nextConfig())
+  })
+
+  it('should add webpack property', () => {
+    const nextConfig = { foo: 'bar' }
+
+    const newConfig = withPrismaPlugin(nextConfig)('phase-development-server', {})
+    expect(newConfig).toHaveProperty('webpack')
+  })
+})