__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()
-    })
-})
\ No newline at end of file

__test/integration.test.ts

+test('add 1+1', () => {
+    expect(1+1).toBe(2)
+})
\ No newline at end of file

__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()
-    })
-})
\ No newline at end of file

__test/unit.test.ts

+import helpers from '../utils/helpers'
+import gitlab from '../controller/gitlab'
+
+test('[/utils/helpers] convert string to array', () => {
+    expect(helpers.stringToArray('foo')).toStrictEqual(["foo"])
+    expect(helpers.stringToArray('foo,bar')).toStrictEqual(["foo","bar"])
+    expect(helpers.stringToArray('')).toBeNull
+    expect(helpers.stringToArray(String(null))).toBeNull
+});
+
+test('[/controller/gitlab] get projects from gitlab', async () => {
+    expect(await gitlab.getProjects(100, 0)).not.toBeNull
+})
+
+test('[/controller/gitlab] get latest pipeline status from gitlab', async () => {
+    expect(await gitlab.getLatestPipelineStatus(97)).toBe("success")
+    expect(await gitlab.getLatestPipelineStatus(0)).toBeUndefined
+})
\ No newline at end of file

utils/helpers.ts

 const helpers = {
   stringToArray: function (input: string) {
-    if (input != null) {
-      return input.split(',')
-    } else {
-      return null
-    }
+    if (!input) { return null }
+    return input.split(',')
   }
 }