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test-lib: introduce required prereq for test runs

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In certain environments or for specific test scenarios we might expect a
specific prerequisite check to succeed. Therefore we would like to abort
running our tests if this is not the case.

To remedy this we add the environment variable GIT_TEST_REQUIRE_PREREQ
which can be set to a space separated list of prereqs. If one of these
prereq tests fail then the whole test run will abort.

Signed-off-by: Fabian Stelzer <fs@gigacodes.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Fabian Stelzer 2021-11-20 16:04:00 +01:00 committed by Junio C Hamano
parent 49da404070
commit 5024ade1b1
2 changed files with 17 additions and 0 deletions
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6
t/README
View file

@ -466,6 +466,12 @@ explicitly providing repositories when accessing submodule objects is
complete or needs to be abandoned for whatever reason (in which case the
migrated codepaths still retain their performance benefits).
GIT_TEST_REQUIRE_PREREQ=<list> allows specifying a space speparated list of
prereqs that are required to succeed. If a prereq in this list is triggered by
a test and then fails then the whole test run will abort. This can help to make
sure the expected tests are executed and not silently skipped when their
dependency breaks or is simply not present in a new environment.
Naming Tests
------------

11
t/test-lib-functions.sh
View file

@ -680,6 +680,17 @@ test_have_prereq () {
# Keep a list of missing prerequisites; restore
# the negative marker if necessary.
prerequisite=${negative_prereq:+!}$prerequisite
# Abort if this prereq was marked as required
if test -n "$GIT_TEST_REQUIRE_PREREQ"
then
case " $GIT_TEST_REQUIRE_PREREQ " in
*" $prerequisite "*)
BAIL_OUT "required prereq $prerequisite failed"
;;
esac
fi
if test -z "$missing_prereq"
then
missing_prereq=$prerequisite