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test-lib: Infrastructure to test and check for prerequisites

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Some tests can be run only if a particular prerequisite is available. For
example, some tests require that an UTF-8 locale is available. Here we
introduce functions that are used in this way:

1. Insert code that checks whether the prerequisite is available. If it is,
   call test_set_prereq with an arbitrary tag name that subsequently can be
   used to check for the prerequisite:

      case $LANG in
      *.utf-8)
            test_set_prereq UTF8
            ;;
      esac

2. In the calls to test_expect_success pass the tag name:

      test_expect_success UTF8 '...description...' '...tests...'

3. There is an auxiliary predicate that can be used anywhere to test for
   a prerequisite explicitly:

      if test_have_prereq UTF8
      then
            ...code to be skipped if prerequisite is not available...
      fi

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
This commit is contained in:
Johannes Sixt
2009-03-01 21:04:46 +01:00
parent 64e61f2d17
commit a7bb394037
2 changed files with 54 additions and 5 deletions
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15
t/t0000-basic.sh
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@ -57,6 +57,21 @@ test_expect_failure 'pretend we have a known breakage' '
test_expect_failure 'pretend we have fixed a known breakage' '
:
'
test_set_prereq HAVEIT
haveit=no
test_expect_success HAVEIT 'test runs if prerequisite is satisfied' '
test_have_prereq HAVEIT &&
haveit=yes
'
donthaveit=yes
test_expect_success DONTHAVEIT 'unmet prerequisite causes test to be skipped' '
donthaveit=no
'
if test $haveit$donthaveit != yesyes
then
say "bug in test framework: prerequisite tags do not work reliably"
exit 1
fi
################################################################
# Basics of the basics