What difficulties may an automation engineer face when running multiple tests simultaneously?

When running multiple tests simultaneously, the automation may encounter several issues:

• Resource access conflicts: if tests use the same files, databases, or external services, collisions and errors may occur.
• Test isolation problems: tests can affect each other if environment independence is not ensured.
• Increased system load: parallel execution can lead to slowdowns or unstable operation of the tested application.
• Debugging difficulties: when errors occur in parallel tests, it is harder to determine which test failed and why.
• Synchronization and timing issues: incorrect management of wait times can lead to false failures.

To address these problems, it is important to use isolated environments, mock external dependencies, apply tools for parallel execution with resource control, and carefully design tests.