Test Doubles Taxonomy for R: Dummy, Stub, Spy, Mock, Fake

· Jakub Sobolewski · June 12, 2026, 12:31 p.m.
R programming Software Testing test doubles software development
Summary
This post clarifies the distinctions between various types of test doubles in R programming: Dummy, Stub, Spy, Mock, and Fake. It discusses their specific uses and the potential pitfalls of confusing them.
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