Hello, I think I found a bug in (srfi srfi-64) module shipped with GNU Guile.
The specification says the following about the count argument to the test-begin form: > The optional count must match the number of test-cases executed by this > group. (Nested test groups count as a single test case for this count.) Thus I believe that following should *not* call on-bad-count-function. (use-modules (srfi srfi-64)) (let ((r (test-runner-null))) (test-runner-current r) (test-runner-on-bad-count! r (λ (runner actual-count expected-count) (pk (test-runner-group-stack runner)) (pk actual-count expected-count))) (test-begin "x" 1) (test-begin "y" 3) (test-assert #t) (test-assert #t) (test-assert #t) (test-end) (test-end)) However as we can see it does: ;;; (("x")) ;;; (3 1) Have a nice day Tomas Volf