How do you synchronize developer tests with your tests? What percentage of tests are written on the service?

To synchronize tests between developers and QA, it is important to establish common standards and processes:

• Use a unified version control system where tests are stored alongside the code.
• Regular meetings or synchronization to discuss coverage and new scenarios.
• Automate test execution in CI/CD so everyone can see the results.
• Divide responsibilities: developers write unit and integration tests at the code level, QA — functional, end-to-end, and load tests.

The percentage of tests on the service depends on the project, but a good practice is to have at least 70-80% coverage with unit and integration tests, with QA supplementing with scenarios that are difficult to cover with code.

Example: if the service is responsible for processing chess moves, developers write tests for the correctness of move logic, and QA — scenarios with real games, checking UI and user interaction.