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 make test HARNESS_OPTIONS=j8

Regression Test Options
-----------------------

The test case scripts are located in directory t/ under the root
build directory, in files named t/*.t .

When the tests are run, those that are not applicable in your OS or
with the build options that you selected will be skipped.

Running a subset of the tests
------------------------------

To run some of the tests, specify TEST_FILES as in the following
example:

 make test TEST_FILES="t/spamc.t t/spamc_l.t"

Wildcards can be used in shell file globbing syntax, as in