What errors can occur when organizing parallel auto-test runs?

When organizing parallel execution of automated tests, the following mistakes are often made:

• Shared access to resources without synchronization: tests may conflict when accessing databases, files, or external services simultaneously.
• Lack of isolation of test data: if tests use the same data, they can affect each other, causing instability.
• Incorrect environment setup: parallel tests may require separate environments or containers; otherwise, conflicts are possible.
• Ignoring infrastructure limitations: too many parallel runs can overload the system and slow down tests.
• Poor logging and debugging: with parallel execution, it is harder to understand which test failed and why without proper log separation.

To avoid these mistakes, ensure test isolation, use unique data, properly configure the environment, and control the load.