Re: ERT: should-error doesn't catch failed assertions

[Noam Postavsky]

Sean McAfee <eefacm <at> gmail.com> writes:

> 
> I've just begin trying to use ERT to write unit tests for my code.  I
> got hung up almost immediately when trying to confirm that a particular
> function call fails an assertion.  A simple example:
> 
> (should-error (cl-assert nil))

Seems to work with

  (should-error (let ((debug-on-error nil)) (cl-assert nil)))

When debug-on-error is non-nil, cl-assert doesn't actually throw an error,
it just calls the debugger directly (see cl--assertion-failed).  ert binds
debug-on-error to t, somewhere along the line.