Are there criteria when testing can be considered complete?

Test completion is a balance between product quality and the time and resources spent. The criteria for ending testing may include:

• Achieving planned test coverage: all critical and major functional scenarios are tested.
• Absence of critical and blocking defects: found bugs are fixed and verified.
• Product stability: after regression testing, no new serious errors are found.
• Meeting quality metrics: for example, the percentage of successful tests exceeds a certain threshold.
• Expiration of allocated time or budget: sometimes testing is concluded for organizational reasons.
• Satisfaction of customer or stakeholder requirements.

Ideally, the decision to end testing is made based on risk analysis and the product's readiness for release.