completion: consolidate test_completion*() tests

diff --git a/t/t4003-diff-rename-1.sh b/t/t4003-diff-rename-1.sh
index c6130c40198ad5ed5ec8a0342341a4ec5cc49d7d..bfa88356382ab9f37e6e510516bf1fc6a3811961 100755 (executable)
--- a/t/t4003-diff-rename-1.sh
+++ b/t/t4003-diff-rename-1.sh
@@ -29,7 +29,7 @@ test_expect_success \
 # copy-and-edit one, and rename-and-edit the other.  We do not say
 # anything about rezrov.
 
-GIT_DIFF_OPTS=--unified=0 git diff-index -M -p $tree >current
+GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current
 cat >expected <<\EOF
 diff --git a/COPYING b/COPYING.1
 copy from COPYING