test: add validation unit tests

Author: danieljtrowbridge

jest.config.js

@@ -0,0 +1,7 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+module.exports = {
+  testEnvironment: 'node',
+  transform: {
+    '^.+.tsx?$': ['ts-jest', {}],
+  },
+}

package.json

@@ -7,7 +7,7 @@
     "format": "prettier --write \"**/*.{js,json,ts,tsx}\"",
     "start": "yarn node dist/index.js",
     "test:types": "yarn tsc --noEmit",
-    "test": "yarn test:types"
+    "test": "yarn test:types && yarn jest"
   },
   "bin": "dist/start.js",
   "files": [
@@ -21,11 +21,14 @@
     "zod": "^3.24.1"
   },
   "devDependencies": {
+    "@jest/globals": "^29.7.0",
     "@types/cors": "^2.8.17",
     "@types/express": "^5.0.0",
     "@types/node": "^22.10.9",
     "eslint": "^9.18.0",
+    "jest": "^29.7.0",
     "prettier": "^3.4.2",
+    "ts-jest": "^29.2.5",
     "typescript": "^5.7.3"
   }
 }

src/handler.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, test } from '@jest/globals'
+
+import { parseRequestBody } from './handler'
+
+describe('parseRequestBody', () => {
+  test('correctly extracts expected fields', () => {
+    expect(
+      parseRequestBody({
+        url: 'url',
+        answer: 'answer',
+        response: 'response',
+        params: { param: 'param' },
+      }),
+    ).toStrictEqual({
+      url: 'url',
+      evaluationFunctionRequestData: {
+        answer: 'answer',
+        response: 'response',
+        params: { param: 'param' },
+      },
+    })
+  })
+
+  test('rejects requests with missing fields', () => {
+    expect(
+      parseRequestBody({
+        answer: 'answer',
+        response: 'response',
+        params: { param: 'param' },
+      }),
+    ).toBeNull()
+    expect(
+      parseRequestBody({
+        url: 'url',
+        response: 'response',
+        params: { param: 'param' },
+      }),
+    ).toBeNull()
+    expect(
+      parseRequestBody({
+        url: 'url',
+        answer: 'answer',
+        params: { param: 'param' },
+      }),
+    ).toBeNull()
+    expect(
+      parseRequestBody({
+        url: 'url',
+        answer: 'answer',
+        response: 'response',
+      }),
+    ).toBeNull()
+  })
+})

tsconfig.json

@@ -20,5 +20,6 @@
     "strict": true,
     "target": "es2016"
   },
-  "exclude": ["dist", "node_modules"]
+  "exclude": ["dist", "node_modules"],
+  "include": ["src"]
 }