A Test Oracle is a source used to determine expected results during software testing. It provides a reference point against which actual results can be compared to assess correctness.
Key Aspects:
- Definition: Identifying what constitutes expected behaviour or output.
- Sources: Can include specifications, documentation, or previous versions of software.
- Comparison Basis: Used to validate actual results against expected outcomes.
Types of Test Oracles:
- Specification-Based Oracles: Derived from requirements documents.
- Historical Oracles: Based on previous versions or known good outputs.
- Heuristic Oracles: Informed by expert knowledge or experience in similar systems.
Using effective test oracles enhances the reliability of testing by providing accurate benchmarks for evaluation.