Terry J. Reedy added the comment:

Replace existing description with

"This class attribute determines what happens when a custom failure message is 
passed as the msg argument to an assertXYY call that fails.  If True, the 
default, the custom message is appended to the end of the standard failure 
message.  If False, the custom message replaces the standard message.

The standard failure message for each *assert method* contains useful 
information about the objects involved.  For example the message from 
assertEqual shows the repr of the two unequal objects.  It is usually easier to 
augment rather than replace this message

The class setting can be overridden in individual test methods by assigning an 
instance attribute, self.longMessage, to True or False before calling the 
assert methods.

New in version 3.1."

----------
nosy: +terry.reedy
stage:  -> needs patch
type:  -> behavior
versions: +Python 3.5

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<http://bugs.python.org/issue26869>
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