update unit test

__tests__/gitlab.unit.test.js

@@ -31,49 +31,31 @@ describe('GitLab API', () => {
   })
 */
 
-  it('returns an existing gitlab-userID by an email address', done => {
-    gitlab.getUserIdByEmail('rosanny.sihombing@hft-stuttgart.de', function(data){
-      try {
-        expect(data.error).toBeFalsy()
-        expect(data.data).not.toBeNull()
-        done()
-      } catch (error) {
-        done(error)
-      }
+  test('returns an existing gitlab user by an email address', async () => {
+    let user = await gitlab.getUserByEmail('putavaliduseremailaddress@here.com')
+    expect(user).not.toBeNull()
   })
+  test('returns an undefined user', async () => {
+    let user = await gitlab.getUserByEmail('johndoe@nowhere.com')
+    expect(user).toBeUndefined()
   })
 
-  it('returns an error due to the non-exist user', done => {
-    gitlab.getUserIdByEmail('test@hft-stuttgart.com', function (data) {
-      try {
-        expect(data.error).toBeTruthy()
-        done()
-      } catch (error) {
-        done(error)
-      }
+  test('returns users project', async () => {
+    let userProjects = await gitlab.getUserProjects('put a valid user id in integer here')
+    expect(userProjects).toBeDefined()
   })
+  test('returns undefined projects, due to non-existing gitlab user ID', async () => {
+    let userProjects = await gitlab.getUserProjects(0)
+    expect(userProjects).toBeUndefined()
   })
 
-  it('returns the projects of a particular userId', done => {
-    gitlab.getUserProjects(3, function (data) {
-      try {
-        expect(data.error).toBeFalsy()
-        expect(data.data).not.toBeNull()
-        done()
-      } catch (error) {
-        done(error)
-      }
+  test('returns a project by ID', async () => {
+    let project = await gitlab.getProjectById(13) // m4lab_landing_page
+    expect(project).toBeDefined()
   })
+  test('returns undefined, due to invalid project ID', async () => {
+    let project = await gitlab.getProjectById(0)
+    expect(project).toBeUndefined()
   })
 
-  it('returns an error due to the wrong userID', done => {  
-    gitlab.getUserProjects('abc', function (data) {
-      try {
-        expect(data.error).toBeTruthy()
-        done()
-      } catch (error) {
-        done(error)
-      }
-    })
-  })
 })
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