Assertion Library
Noun · Development
Definitions
A testing library that provides expressive helpers for checking expected values, errors, object shapes, and other conditions in unit or integration tests. Assertion libraries improve readability by turning low-level comparisons into clear intent like 'contains', 'throws', or 'deep equals'.
In plain English: A testing library that makes it easier to state what a test expects.
Example: "The team adopted an assertion library with snapshot and partial-match helpers so the API contract tests were easier to read and maintain."