TDD with NestJS

Thiago Zilli Sarmento

2020 May

So why TDD test?

Just a few reasons (of many)...

• Find bugs early...

• Find regressions before someone else finds them...

• Supports easier implementation refactoring...

• Pseudo documentation in code...

• etc...

Just a few reasons (of many)...

• Tests must be part of Continuous Integration...

• Tests must be part of Continuous Deploy...

• Tests must be part of work flow... (sap)

• Database interactions...

• API endpoints (end-to-end)...

• Metrics...

• Test A and Test B behavior... and more

70% code coverage is required for basic metrics!

• Avoid having side effects in your functions

• Tests should NOT rely on testing order (run independently)

• Tests should be repeatable

• Bogus your inputs

Resorces

• https://nestjs.com/

• https://jestjs.io/

• https://github.com/visionmedia/supertest