How deeply does The Art of Unit Testing 3e cover regression?

Defines regression plainly and explains its testing consequences, while deferring how rapid detection is implemented.

Regression

As explained in The Art of Unit Testing 3e

A previously working software behavior that becomes broken after a change.

A regression is functionality that used to work but is now broken after a change. It can affect a single unit of work or several previously working behaviors. section 1.8

Regressions are easy to miss when shared code or data changes over time. They often appear near a sprint or release deadline, when a fix for one bug accidentally introduces another. section 1.8

Use runnable tests as a safety net:

Run tests for earlier features after making a change, rather than assuming they still work. section 1.8
Make tests accessible so teammates can check whether a change broke code they depend on. section 1.8
Treat reliable test results as confidence to change unfamiliar or legacy code. section 1.8

How The Art of Unit Testing 3e covers it

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Also explained in

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Machine Learning System DesignA software defect in which a change causes previously working behavior to fail or deteriorate.
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Unit Testing Principles, Practices, and PatternsA regression is a defect in which a feature that previously worked stops working as intended after a change or other event.
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Designing Deep Learning Systems: A guide for software engineersA deterioration in a model's measured performance relative to an earlier version or evaluation.
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Secrets of the JavaScript Ninja, Second EditionA failure of previously working software behavior following a change.

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Related concepts

fine-tuningproduced by · Fine-tuning is adapting a pretrained machine-learning model by training it further on targeted data or objectives for a task, domain, or behavior.
data driftcontrasts with · Data drift is a change over time in the statistical distribution or characteristics of data relative to a reference distribution or set of characteristics.
testaddressed by · A test is a procedure or check that evaluates behavior using specified inputs or evidence against expected results or criteria.
refactoringproduced by · Refactoring is the restructuring of existing software or code to change its internal organization and improve its design, typically while preserving externally observable behavior.
linear regressionincludes · Linear regression is a statistical modeling method that estimates a continuous response as a linear combination of predictor variables and fitted coefficients.

This explainer was generated by Manning's knowledge graph from the text of The Art of Unit Testing 3e. The section links point to the parts of the book it draws on.