tests: introduce test_unset_prereq, for debugging

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index b895366feef6027ac00bf47271b2530e8b7e7162..dfe99b080f676b85e01fc78da9a5769702be61d3 100644 (file)
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -278,8 +278,20 @@ write_script () {
 # The single parameter is the prerequisite tag (a simple word, in all
 # capital letters by convention).
 
+test_unset_prereq () {
+       ! test_have_prereq "$1" ||
+       satisfied_prereq="${satisfied_prereq% $1 *} ${satisfied_prereq#* $1 }"
+}
+
 test_set_prereq () {
-       satisfied_prereq="$satisfied_prereq$1 "
+       case "$1" in
+       !*)
+               test_unset_prereq "${1#!}"
+               ;;
+       *)
+               satisfied_prereq="$satisfied_prereq$1 "
+               ;;
+       esac
 }
 satisfied_prereq=" "
 lazily_testable_prereq= lazily_tested_prereq=