Test grep --and/--or/--not

diff --git a/t/t2000-checkout-cache-clash.sh b/t/t2000-checkout-cache-clash.sh
index 5141fab7cf567fc5d16a8e9a296d2aff5f6c67e6..f7e1a735ec8699616280a086f59dc50c078bfaa7 100755 (executable)
--- a/t/t2000-checkout-cache-clash.sh
+++ b/t/t2000-checkout-cache-clash.sh
@@ -38,7 +38,7 @@ date >path1
 
 test_expect_success \
     'git checkout-index without -f should fail on conflicting work tree.' \
-    '! git checkout-index -a'
+    'test_must_fail git checkout-index -a'
 
 test_expect_success \
     'git checkout-index with -f should succeed.' \