ert: Mocks and Stubs

 
 6.1 Other Tools for Emacs Lisp
 ==============================
 
 Stubbing out functions or using so-called _mocks_ can make it easier to
 write tests.  See <http://en.wikipedia.org/wiki/Mock_object> for an
 explanation of the corresponding concepts in object-oriented languages.
 
    ERT does not have built-in support for mocks or stubs.  The package
 ‘el-mock’ (see <http://www.emacswiki.org/emacs/el-mock.el>) offers mocks
 for Emacs Lisp and can be used in conjunction with ERT.