What to do if regression testing is required but there is not enough time to perform it?

Adjust the scope of testing:

• Prioritization: Identify critical and high-risk areas based on importance, usage frequency, and defect history.
• Selective testing: Focus on testing changes, their direct impact on related functionalities, and key end-to-end scenarios.
• Use existing data: Reuse previously created test data and environments if possible to speed up the process.

Optimize the process:

• Parallel execution: Divide the test set among multiple QA engineers for simultaneous execution.
• Automation: Maximize the use of existing automated regression tests.
• Exploratory Testing with focus: Apply exploratory testing to the most risky areas, relying on experience and intuition.

Interaction with the team:

• Communication: Discuss with the manager, developers, and product owner the time constraints and risks of incomplete testing.
• Risk acceptance: Jointly decide on an acceptable level of risk, defining which areas can be tested less thoroughly.
• Deferred testing: Plan full regression testing for the next sprint or after release if risks allow.

Summary of actions:

1. Prioritize test cases.
2. Selective test execution.
3. Maximize automation.
4. Parallel test execution.
5. Clear communication about risks and scope.

This approach helps to manage testing within limited time while focusing on critical areas.