ert: How to Run Tests

 
 2 How to Run Tests
 ******************
 
 You can run tests either in the Emacs you are working in, or on the
 command line in a separate Emacs process in batch mode (i.e., with no
 user interface).  The former mode is convenient during interactive
 development, the latter is useful to make sure that tests pass
 independently of your customizations; and it allows you to invoke tests
 from makefiles, and to write scripts that run tests in several different
 Emacs versions.
 

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