unit test, but is not working

federation/package.json

@@ -11,6 +11,7 @@
     "build": "tsc --build",
     "clean": "tsc --build --clean",
     "start": "cross-env TZ=UTC TS_NODE_BASEURL=./build node -r tsconfig-paths/register build/src/index.js",
+    "test": "cross-env TZ=UTC NODE_ENV=development jest --runInBand --coverage --forceExit --detectOpenHandles",
     "dev": "cross-env TZ=UTC nodemon -w src --ext ts --exec ts-node -r dotenv/config -r tsconfig-paths/register src/index.ts",
     "lint": "eslint --max-warnings=0 --ext .js,.ts ."
   },
@@ -31,10 +32,13 @@
     "type-graphql": "^1.1.1"
   },
   "devDependencies": {
-    "@typescript-eslint/eslint-plugin": "^4.28.0",
-    "@typescript-eslint/parser": "^4.28.0",
+    "@types/express": "4.17.12",
+    "@types/jest": "27.0.2",
     "@types/lodash.clonedeep": "^4.5.6",
     "@types/node": "^16.10.3",
+    "@typescript-eslint/eslint-plugin": "^4.28.0",
+    "@typescript-eslint/parser": "^4.28.0",
+    "apollo-server-testing": "2.25.2",
     "eslint": "^7.29.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-config-standard": "^16.0.3",
@@ -42,8 +46,9 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.4.0",
     "eslint-plugin-promise": "^5.1.0",
+    "jest": "27.2.4",
+    "nodemon": "^2.0.7",
     "prettier": "^2.3.1",
-    "typescript": "^4.3.4",
-    "nodemon": "^2.0.7"
+    "typescript": "^4.3.4"
   }
 }

federation/src/graphql/api/1_0/resolver/TestResolver.test.ts

@@ -0,0 +1,42 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
+import { createTestClient } from 'apollo-server-testing'
+import createServer from '@/server/createServer'
+
+jest.mock('@/config')
+
+let query: any
+
+// to do: We need a setup for the tests that closes the connection
+let con: any
+
+beforeAll(async () => {
+  const server = await createServer()
+  con = server.con
+  query = createTestClient(server.apollo).query
+})
+
+afterAll(async () => {
+  await con.close()
+})
+
+describe('TestResolver', () => {
+  const getTestQuery = `
+    query {
+      test {
+        api
+      }
+    }
+  `
+
+  describe('getTestApi', () => {
+    it('returns 1_0', async () => {
+      await expect(query({ query: getTestQuery })).resolves.toMatchObject({
+        data: {
+          api: '1_0',
+        },
+      })
+    })
+  })
+})