What is the best way to introduce testing into a finished project?

Question

PHP

The company has a ready-made project without testing, the task was to introduce testing for the product to detect bugs at an early stage in the previously completed functionality, but I don’t quite understand what types of tests need to be implemented for a more optimal solution to the problem?

Answer 1

You write End-to-End, integration tests -> you pass by hand -> you automate -> PROFIT

Answer 2

In a ready-made, the early stage will not work. Most likely, first of all, you want regression, requirements testing, unit and integration testing.
Next, you need to decide whether automation is manual or hybrid. Depends on the product and team.
The main thing is to be prepared that the introduction of testing will shake the current processes)