test: add example lambda tests

functions/example-lambda/handler.ts

@@ -17,15 +17,14 @@ import { httpErrorHandlerConfigured } from "../../shared/middleware/http-error-h
 import { createFindManyOptions, makePaginationResult } from "../../shared/pagination-utils/pagination-utils";
 import { Like } from "typeorm";
 
-const connectToDb = dataSource.initialize();
 const config = createConfig(process.env);
 const userRepository = dataSource.getRepository(ExampleModel);
 
-const lambdaHandler = async (event: ExampleLambdaPayload) => {
+export const lambdaHandler = async (event: ExampleLambdaPayload) => {
   const queryParams = event.queryStringParameters;
   winstonLogger.info(`Hello from ${config.appName}. Example param is: ${queryParams.exampleParam}`);
 
-  await connectToDb;
+  await dataSource.initialize();
 
   const findOptions = createFindManyOptions(userRepository, queryParams);
 

functions/example-lambda/tests/handler.spec.ts

@@ -1,19 +1,90 @@
-import request from "supertest";
+import sinon from "sinon";
+import { DataSource, Repository } from "typeorm";
+import { lambdaHandler } from "../handler";
+import assert from "assert";
+import { StatusCodes } from "http-status-codes";
 
 describe("test endpoint", () => {
-  const server = request("http://localhost:1337/");
+  let sandbox: sinon.SinonSandbox;
+  let userRepositoryStub: sinon.SinonStub;
+  let dataSourceStub: sinon.SinonStub;
+  let metadataStub: sinon.SinonStub;
 
-  describe("Test obligatory query parameter", () => {
-    it("GET `dev/?exampleParam=test` returns 200", () => {
-      return server.get("dev/users").query("exampleParam=test").expect(200);
-    });
+  const data = [
+    {
+      id: "50ece88a-61ac-4435-8457-051693716276",
+      firstName: "John",
+      lastName: "Doe",
+      email: "[email protected]",
+    },
+    {
+      id: "8eb91b5f-63ef-4ca8-9db4-3fa6f173f1ae",
+      firstName: "Mark",
+      lastName: "Smith",
+      email: "[email protected]",
+    }
+  ];
+
+  const pagination = {
+    page: 1,
+    limit: 3,
+    total: 2,
+    totalPages: 1
+  };
+
+  const params = {
+      exampleParam: "example",
+      page: "1",
+      limit: "3",
+  };
 
-    it("GET `dev` returns bad request", () => {
-      return server.get("dev/users").expect(400);
+  beforeEach(() => {  
+    sandbox = sinon.createSandbox();
+    userRepositoryStub = sandbox.stub(Repository.prototype, "findAndCount").resolves([data, 2]);
+    dataSourceStub = sandbox.stub(DataSource.prototype, "initialize").resolves();
+    metadataStub = sandbox.stub(Repository.prototype, "metadata");
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  describe("GET dev/users", () => {
+    it("should return users", async () => {
+      metadataStub.value({
+        columns: [{ propertyName: "email", }, { propertyName: "firstName" }]
+      });
+      const filters  = {
+        sort: {  email: "ASC" },
+        filter: { firstName: "John" },
+        search: "Doe",
+      };
+
+      const response = await lambdaHandler({ 
+        queryStringParameters: { ...params,  ...filters }
+      });
+
+      const parshedResponse = JSON.parse(response.body);
+      assert.equal(response.statusCode, StatusCodes.OK);
+      assert.deepEqual(parshedResponse, { meta: { pagination, ...filters }, data });
     });
 
-    it("GET 'any' returns not found", () => {
-      return server.get("any").expect(404);
+    it("shouldn't return filters if they are not available", async () => {
+      metadataStub.value({
+        columns: [{ propertyName: "id", }, { propertyName: "lastName" }]
+      });
+
+      const response = await lambdaHandler({
+        queryStringParameters: { 
+          ...params, 
+          sort: { email: "ASC", id: "ASC" },
+          filter: { firstName: "John", lastName: "Doe" },
+        }
+      });
+
+      const parshedResponse = JSON.parse(response.body);
+      assert.equal(response.statusCode, StatusCodes.OK);
+      assert.deepEqual(parshedResponse, { meta: { pagination, sort: { id: "ASC" }, filter: { lastName: "Doe" }}, data });
     });
   });
 });

package.json

@@ -44,6 +44,7 @@
     "dotenv": "^16.3.1",
     "http-status-codes": "^2.3.0",
     "pg": "^8.11.3",
+    "sinon": "^17.0.1",
     "ts-pipe-compose": "^0.2.1",
     "typeorm": "^0.3.17",
     "winston": "^3.11.0",
@@ -57,6 +58,7 @@
     "@types/aws-lambda": "^8.10.124",
     "@types/mocha": "^10.0.2",
     "@types/node": "^20.11.17",
+    "@types/sinon": "^17.0.3",
     "@types/supertest": "^2.0.14",
     "@typescript-eslint/eslint-plugin": "^6.7.4",
     "@typescript-eslint/parser": "^6.7.4",