Automated testing node js and database

Question

I'm using jenkins to automate the testing of my node js application? How do I test the queries to the database? How does Jenkins know to build the mongo db database first? How does automated testing work with database?

Answer 1

I don't use Jenkins for CI, I tend to use TeamCity, but I think your questions can be answered independently of which CI technology you use.

There is no definite answer to your questions, it all depends:

If you are looking to implement full integration tests, including querying a real database, then I would suggest creating a separate database just for testing like - mydb-test. You would have to configure your tests to use this database via config etc. In case you want to isolate your tests from the data access layer, then you need to mock the data access. This can be done by using a mock library, this will be easier to use depending on how well architected is your application code, where dependency injection IMHO is really important on this matter.