Login middleware refactor and tests

[JasonChong96]

Problem

General lack of automated tests for the repository and high degrees of coupling.

Closes [#83]

Solution

• Refactor mail service and crypto service to be injected dependencies
• Add tests for login middleware

Improvements:

• Introduce coveralls integration for test coverage analysis
• (Backend) Statements test coverage is now >23%
• When OTP emails fail to send, an error is now logged.
• Add common jest setup file for reflect-metadata import and mock config setup. This reduces code repetition across test suites.

Tests

• Run npm run test

Deploy Notes

New dependencies:

• coveralls : Coveralls integration

[liangyuanruo]

code lgtm unless @yong-jie has any further suggestions. do resolve the merge conflicts.

[yong-jie]

lgtm!

Test