WhatsApp/assert

This system is an Erlang assertion library that provides core testing utilities including pattern matching, value comparison, and diagnostic diffing. Recent development has focused on expanding the macro suite with new comparison and intermediate value capture features while refining error reporting and diagnostic clarity. The codebase has also undergone maintenance to enforce stricter type safety through tagged unions and to ensure compatibility with Erlang/OTP 27.

3 changes.

The period centered on the initial release of the assert library for Erlang, establishing core assertion, blame, and diff utilities alongside a foundational test suite. This development effort was complemented by structural updates to the project documentation, including reorganizing the README and configuring ex\_doc to properly include license and reference materials.

1 change.

The test suite data for \assertMatch\ has been updated to reflect changes in how assertion failures are reported. The implementation in \assert\_match.erl\ now directly invokes the error-raising logic within the expression evaluation, simplifying the control flow. Correspondingly, the expected output in \assert\_match.expected\ has been adjusted to show the new error structure, which includes the matched value and specific error info for the pattern, ensuring the tests accurately validate the current error reporting behavior.

1 change.

The library now requires Erlang/OTP 27 as the minimum version, dropping support for OTP 26. Additionally, the wa\_diff library's compute/2 function has been updated to return a tagged union ({eq, Value} or {diff, Left, Right}) instead of a map, providing stricter equality checks and a more explicit return structure for users comparing Erlang data types.

1 change.

The test suite now includes comprehensive tests for new assertion capabilities, specifically the \assertNotMatch\ macro, various comparison assertions (greater than, less than, in-range, with delta), and intermediate value capture for short-circuit expressions. Additionally, the \wa\_diff\ tests have been updated to reflect a change in the return type of \wa\_diff:compute\ from a map to a tagged union (\{eq, ...}\ or \{diff, ...}\), and the \assertion\ test case has been corrected to pass arguments in the proper order to \?assertEqual\.

4 changes.

This period focused on enhancing the debugging experience by improving assertion error reporting, including the addition of new macros and clearer diagnostic messages. The work also addressed minor code quality issues by fixing Dialyzer opaque warnings and correcting EDoc formatting in the source files.

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 71 → 72 (+0.9)
• Rubric changed (rubric-2026.09.12 → rubric-2026.09.18) — scores are not directly comparable.

• Code Health 96 → 96 (-0.0)
• Architecture 100 → 100 (+0.0)
• Maturity 59 → 59 (+0.0)
• Readiness 64 → 68 (+3.6)
• Security 100 → 100 (+0.0)

• Coverage not measured — no coverage collector is wired up
• Documentation: no installation or build instructions (README.md)
• Documentation: no licence statement (README.md)
• Documentation: no usage examples (README.md)

• Outdated: erlfmt

• 3 commits — 1 feature/other, 2 fixes

• .github/workflows — 2 commits
• test/wa_blame_SUITE.erl — 1 commit

• fix: Fix EDoc failure in wa_diff and check docs in CI
• fix: Test OTP 28 and 29 in CI and fix Dialyzer opaque warning (#6)
• change: wa_blame: give function_clause_multiple_args a real multi-argument body

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

WhatsApp/assert was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.