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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.