BELOW IS A COMPLETE LIST OF THE TESTS TO CHECK FOR COMPLETENESS
NIEDUUI-248:
* SurveyController
* should be defined
* findSurveys
* should return a survey given the id
* should return multiple surveys given the ids
* getSurveyResult
* should return the public answers of a survey given the Id
* getOpenSurveys
* should return the list of open (not jet participated) surveys
* getCreatedSurveys
* should return the list of surveys that the user created
* getAnsweredSurveys
* should return the list of surveys the user has participated (answered) already
* getAllSurveys
* should return the full list of surveys
* getCommittedSurveyAnswers
* should return the commited answer for a survey from user document
* updateOrCreateSurvey
* should update a survey if it exists already
* should create a survey if it does not exists already
* should throw an error if the survey update fails
* deleteSurvey
* should remove a survey
* should remove multiple surveys
* should throw an error if the survey was not found
* should throw an error if the survey removal fails
* answerSurvey
* should add an answer to a survey
* should throw an error if adding an answer fails
* in order to add an public answer it has to update the survey (first)
* in order to add an public answer it has to update the survey (second)
* addPublicAnswer
* throw an error if the survey with the surveyId was not found
* throw an error if a user adds an answer that is not marked as participating user
* throw an error if a user adds an answer that already has participated and the survey does not accept multiple answers
* should throw an error if the survey update fails
* SurveyService
* should be defined
* findAllSurveys
* should return all surveys
* findSurvey
* should return a single survey by ID
* findSurveys
* should return multiple surveys by ID
* updateSurvey
* should update a survey
* should throw an error if the survey update fails
* createSurvey
* should create a survey
* should throw an error if the survey creation fails
* addPublicAnswer
* throw an error if the survey with the surveyId was not found
* throw an error if a user adds an answer that is not marked as participating user
* throw an error if a user adds an answer that already has participated and the survey does not accept multiple answers
* in order to add an public answer it has to update the survey
* UsersSurveysService
* should be defined
* getExistingUser
* should return a user
* should throw an error if the user is not found
* updateUser
* should update a user
* getOpenSurveyIds
* should return open survey ids
* getCreatedSurveyIds
* should return created survey ids
* getAnsweredSurveyIds
* should return answered survey ids
* onRemoveSurvey
* should remove survey from list of openSurveys if survey gets deleted and is open
* should remove survey from list of createdSurveys if survey gets deleted and is in the created list
* should remove survey from list of answeredSurveys if survey gets deleted was already answered
* should remove survey from list of open-, created-, and answeredSurveys list if survey gets deleted and is included in all 3 (somehow)
* should not remove any surveyId if the deleted id is not included in any of the lists
* should throw an error if the user is not found
* addToCreatedSurveys
* should add a survey to the list of created surveys
* should throw an error if the user is not found
* addAnswer
* should remove the survey from open surveys and move it to answered together with the answer
* addToOpenSurveys
* should add a survey to open surveys
* should throw an error if the user is not found
* populateSurvey
* should populate survey to first participant
* should populate survey to second participant
* getCommitedAnswer
* should return the previously commited answer for the survey with props.surveyId from user with props.username
JIRA: https://schulz-informatik.atlassian.net/browse/NIEDUUI-248
BELOW IS A COMPLETE LIST OF THE TESTS TO CHECK FOR COMPLETENESS