'
+test_expect_success 'prune: prune nonsense parameters' '
+
+ test_must_fail git prune garbage &&
+ test_must_fail git prune --- &&
+ test_must_fail git prune --no-such-option
+
+'
+
+test_expect_success 'prune: prune unreachable heads' '
+
+ git config core.logAllRefUpdates false &&
+ mv .git/logs .git/logs.old &&
+ : > file2 &&
+ git add file2 &&
+ git commit -m temporary &&
+ tmp_head=$(git rev-list -1 HEAD) &&
+ git reset HEAD^ &&
+ git prune &&
+ test_must_fail git reset $tmp_head --
+
+'
+
+test_expect_success 'prune: do not prune heads listed as an argument' '
+
+ : > file2 &&
+ git add file2 &&
+ git commit -m temporary &&
+ tmp_head=$(git rev-list -1 HEAD) &&
+ git reset HEAD^ &&
+ git prune -- $tmp_head &&
+ git reset $tmp_head --
+
+'
+
test_done