Persistent Predecessor

Efficient Testing with Virtual Machines: Unleashing the Potential of Persistent Predecessors

A persistent predecessor is a virtual machine or testing environment that is intentionally maintained in a specific, predefined state and does not start from a clean or default state for testing purposes. This state, often referred to as a “golden image” or “baseline,” is carefully configured to represent a known and stable starting point for testing software applications or systems. By using a persistent predecessor, testers can repeatedly conduct tests and experiments in a controlled environment, ensuring consistent conditions and results for testing and validation purposes. This approach simplifies testing processes, accelerates testing cycles, and enhances the reproducibility of test results.

In essence, a persistent predecessor provides a stable and reliable foundation for testing by preserving a predetermined state, which is particularly valuable for regression testing and ensuring consistent test conditions across test runs.

Key Aspects

Stable State

The persistent predecessor is intentionally maintained in a stable state, often referred to as a "golden image" or "baseline." This state represents a known and well-configured starting point for testing.


By using a persistent predecessor, testers can reproduce the same testing environment for each test run, ensuring consistent conditions and results. This is essential for achieving reproducible test outcomes.


Testing with a persistent predecessor can be more efficient than starting from a clean state for each test cycle. It eliminates the need to set up the entire environment from scratch, saving time and resources.

Regression Testing

Persistent predecessors are particularly valuable for regression testing, as they allow testers to quickly retest software after code changes while maintaining the same baseline environment.


The consistent environment provided by a persistent predecessor reduces the likelihood of environmental factors affecting test results. It helps identify true software issues rather than issues caused by variations in the testing environment.


Testers can isolate the software being tested from external influences, ensuring that the testing environment remains controlled and unaffected by external changes.

Resource Optimization

It allows for efficient use of resources, as only the necessary components or aspects of the environment are modified or updated for each test cycle.


The use of persistent predecessors can scale to accommodate testing in various environments, such as different operating systems or configurations.

Version Control

Persistent predecessors are version-controlled, ensuring that the environment corresponds to the specific version of the software being tested.


The persistent predecessor can be customized to match specific test scenarios or configurations, providing flexibility for different testing needs.

Cost Reduction

While there may be initial setup costs, the use of persistent predecessors can ultimately reduce testing costs by streamlining processes and improving efficiency.

The key aspects of a persistent predecessor in software testing revolve around stability, reproducibility, efficiency, and consistency. This approach simplifies testing processes, reduces the risk of environmental issues affecting results, and facilitates thorough and controlled testing of software applications or systems.


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