t5550: do not assume the "matching" push is the default

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 8889ba5104cd3f7c783a179d45816d3a82685ef0..22a4f8fb64a4e8084139fc148e8e7dd4aa73d684 100644 (file)
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -275,6 +275,15 @@ test_have_prereq () {
 
        for prerequisite
        do
+               case "$prerequisite" in
+               !*)
+                       negative_prereq=t
+                       prerequisite=${prerequisite#!}
+                       ;;
+               *)
+                       negative_prereq=
+               esac
+
                case " $lazily_tested_prereq " in
                *" $prerequisite "*)
                        ;;
@@ -294,10 +303,20 @@ test_have_prereq () {
                total_prereq=$(($total_prereq + 1))
                case "$satisfied_prereq" in
                *" $prerequisite "*)
+                       satisfied_this_prereq=t
+                       ;;
+               *)
+                       satisfied_this_prereq=
+               esac
+
+               case "$satisfied_this_prereq,$negative_prereq" in
+               t,|,t)
                        ok_prereq=$(($ok_prereq + 1))
                        ;;
                *)
-                       # Keep a list of missing prerequisites
+                       # Keep a list of missing prerequisites; restore
+                       # the negative marker if necessary.
+                       prerequisite=${negative_prereq:+!}$prerequisite
                        if test -z "$missing_prereq"
                        then
                                missing_prereq=$prerequisite