Overview

This reference is generated from the source docstrings and is grouped by the mixin that implements each assertion, mirroring the code layout.

The assertions actually available on a value are the union of the mixins for its type. For example, on a string (assert_that("x")) you can call everything on String assertions, Containment assertions, Core & objects, and File & path assertions. For a task-oriented view organized by value type instead, see the Type assertions guide.

• Entry points - the top-level functions such as assert_that, assert_warn, soft_assertions, and fail.
• Matchers - the match.* namespace of composable matchers.
• Core & objects - assertions available on every value (equality, identity, satisfies, ...).
• Type-specific pages - strings, numbers, collections, dicts, dates, files, bytes.
• Dynamic assertions - the has_<name>() family.
• Structured failures and Async & eventual assertions.

Signatures here are the runtime implementations. How the static return type narrows per value type (the typed overloads that drive editor autocomplete) is explained in Type safety.