make config --add behave correctly for empty and NULL values

diff --git a/t/t1303-wacky-config.sh b/t/t1303-wacky-config.sh
index 3a2c81968cf7d539410358de1c8af6cf1d2500c9..3b92083e19d09bad951519201f9605a17b168c1a 100755 (executable)
--- a/t/t1303-wacky-config.sh
+++ b/t/t1303-wacky-config.sh
@@ -111,4 +111,24 @@ test_expect_success 'unset many entries' '
        test_must_fail git config section.key
 '
 
+test_expect_success '--add appends new value after existing empty value' '
+       cat >expect <<-\EOF &&
+
+
+       fool
+       roll
+       EOF
+       cp .git/config .git/config.old &&
+       test_when_finished "mv .git/config.old .git/config" &&
+       cat >.git/config <<-\EOF &&
+       [foo]
+               baz
+               baz =
+               baz = fool
+       EOF
+       git config --add foo.baz roll &&
+       git config --get-all foo.baz >output &&
+       test_cmp expect output
+'
+
 test_done