Regression Testing Methodology

After modifications have been done to an existing application, you need confidence that those modifications have not negatively impacted other functionality. That’s where regression testing comes in.

Regression testing alone can encompass up to three-quarters of the total cost of testing.

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Maintaining Regression Test Inventory

  • Identify obsolete tests
  • Modify tests to reflect changes
  • Create new ones for new functionality

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Three Phases of Regression Testing

Phase 1

Focused Regression

Covers the specific functionality around the new or modified code.

Phase 2

Expanded Regression

Executed after all coding is complete and the code is frozen. If possible, it’s done using an automation tool

Phase 3

New Release Functional Regression

Select 30% of the newly added functional test cases as a mini-regression at the end of the cycle. This phase focuses only on the new enhancements, not existing functionality.

With this methodology, we know we can reduce regression testing costs by reducing the time it takes to test, and without sacrificing quality as a result.

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