GitLab

* lisp/calc/calc-units.el (math-units-in-expr-p)
(math-single-units-in-expr-p, math-find-compatible-unit-rec)
(math-extract-units): Handle the `neg' operator.  (Bug#19582)
* test/automated/calc-tests.el (calc-tests-equal, calc-tests-simple):
New functions.
(test-calc-remove-units, test-calc-extract-units)
(test-calc-convert-units): New tests.