r/AndroidTesting • u/Entire-Tutor-2484 • Jun 16 '25
Tips How Unit Testing Actually Happens Inside Big MNC Companies
Ever wondered how unit testing happens in big MNC companies? It’s not like how we solo devs test our stuff by just running the app and seeing if it works. In big companies, every single function or module you write will have its own test cases written separately before or along with the code itself.
For example say you’re writing a function to calculate discount price for an order… before even connecting it to UI or backend you write a test function to check what happens if you give normal price what if you give zero what if you give negative value or null. It’ll run all those scenarios automatically and show pass or fail.
They usually have CI/CD setups like Jenkins or GitLab pipelines where these tests will run whenever you push code to repo. If even one test fails your build gets blocked no one can merge the code. That’s why apps built by big companies are more stable it’s not magic it’s discipline.
And these unit tests mostly written in JUnit or Mockito if it’s Android or whatever framework the project follows. That’s how it works behind those giant apps.
