This module contains hledger's unit tests. These are built in to hledger,
and can be run at any time by doing hledger test (or, with a few more
options, by doing make unittest in the hledger source tree.)
Other kinds of tests:
hledger's functional tests are a set of shell/command-line tests defined
by .test files in the tests/ subdirectory. These can be run by doing
make functest in the hledger source tree.
hledger's doctests are shell tests defined in literal blocks in haddock
documentation in the source, run by doing make doctest in the hledger
source tree. They are no longer used, but here is an example:
$ hledger -f sample.ledger balance o
$1 expenses:food
$-2 income
$-1 gifts
$-1 salary
--------------------
$-1
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