add unit test (jest)

(cherry picked from commit c8c8abc3)

__test/gitlab.test.ts

+const gitlab = require('../functions/gitlab')
+
+describe('GitLab API', () => {
+    test('get all projects', async () => {
+        let projects = await gitlab.getProjects(10, 0)
+        expect(projects).not.toBeNull()
+    })
+    test('get latest pipeline status of a project', async () => {
+        let status = await gitlab.getLatestPipelineStatus(81)
+        expect(status).not.toBeNull()
+    })
+})
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__test/methods.test.ts

+const methods = require('../functions/methods')
+
+describe('DB methods', () => {
+    test('all mailinglists', async () => {
+        let lists = await methods.getAllMailinglists(0)
+        expect(lists).not.toBeNull()
+    })
+    test('project overview', async () => {
+        let overview = await methods.getProjectOverviewById(81)
+        expect(overview).not.toBeNull()
+    })
+    test('project images', async () => {
+        let images = await methods.getProjectImagesById(81)
+        expect(images).not.toBeNull()
+    })
+})
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jest.config.js

+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};
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package.json

@@ -17,7 +17,7 @@
     "start": "nodemon app.ts",
     "build": "tsc -build",
     "clean": "tsc -build --clean",
-    "test": ""
+    "test": "jest"
   },
   "dependencies": {
     "async": "^3.2.0",
@@ -43,9 +43,12 @@
     "@types/express-fileupload": "^1.1.6",
     "@types/express-flash": "^0.0.2",
     "@types/express-session": "^1.17.3",
+    "@types/jest": "^26.0.24",
     "@types/morgan": "^1.9.2",
     "@types/passport": "^1.0.6",
+    "jest": "^27.0.6",
     "nodemon": "^2.0.9",
+    "ts-jest": "^27.0.3",
     "ts-node": "^10.0.0",
     "typescript": "^4.3.5"
   }

tsconfig.json

 {
+  "exclude": ["node_modules", "__test", "jest.config.js"],
   "compilerOptions": {
     "target": "es6",
     "module": "commonjs",
-    "rootDir": "./",
+    "strict": true,
     "outDir": "./built",
+    "rootDir": "./",
     "esModuleInterop": true,
-    "strict": true,
     "allowJs": true
   }
 }
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