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A
.Em test filter
is a string that is used to match test cases or test programs in a test suite.
Filters have the following form:
.Bd -literal -offset indent
test_program_name[:test_case_name]
.Ed
.Pp
Where
.Sq test_program_name
is the name of a test program or a subdirectory in the test suite, and
.Sq test_case_name
is the name of a test case.
