Create end to end functional tests for the API

[krashish8]

• Create end to end functional tests similar to https://github.com/Georepublic/pg_scheduleserv/blob/main/e2e_test/project_test.go
  • Data can be loaded directly into PostgreSQL from an SQL file using some script. The tests will check whether Get/Create/Update/Delete give a correct result.
• Add unit tests for any code that involves logic (such as utility functions) e.g. https://github.com/Georepublic/pg_scheduleserv/blob/main/internal/util/conversion_test.go
  • For other files that don't involve much logic, unit tests can be added later on or entirely avoided.
  • Unit tests involve testing each function independently and the main logic of this application lies in the vrprouting extension, so a complete end-to-end test is more beneficial.
• Check the code coverage
• Fix any bugs detected from the tests.

[krashish8]

Almost all the end-to-end functional tests are done. Maybe I'll add the vroom doc example tests too.