Resolvers: Create tests for Mutations.js

[SiddheshKukade]

The Talawa-API code base needs to be 100% reliable. This means we need to have 100% test code coverage.

Tests need to be written for file lib/resolvers/post_query/mutation.js

• We will need the API to be refactored for all methods, classes, and/or functions found in this file for testing to be correctly executed.

• When complete, all methods, classes, and/or functions in the refactored file will need to be tested. These tests must be placed in a

  single file with the name tests/resolvers/mutations.spec.js. You may need to create the appropriate directory structure to do this.

IMPORTANT:

Please refer to the parent issue on how to implement these tests correctly:
#490

• PR Acceptance Criteria

• When complete this file must show 100% coverage when merged into the code base. This will be clearly visible when you submit your PR.

• The current code coverage for the file can be found here. If the file isn't found in this directory, or there is a 404 error, then tests have not been created.

• The PR will show a report for the code coverage for the file you have added. You can use that as a guide.

[SiddheshKukade]

• This issue is created to increase code coverage of my Pull Request [GSoC][Feature Request] : Plugin Architecture for Server #730 (I could not find exisiting issue for the file so I created a new one)

• the test/resolvers/post_query/mutation.js can be found here ff9749b

• Merging PR [GSoC][Feature Request] : Plugin Architecture for Server #730 Can close this issue

[SiddheshKukade]

@palisadoes The issue can be assigned to me