fix portability issues with $ in double quotes

diff --git a/t/t1100-commit-tree-options.sh b/t/t1100-commit-tree-options.sh
index 7f7fc36734d96de96801c59af41024db97dc614d..c4414ff576fc03b3234c532bfdcd0f2c8eca9c09 100755 (executable)
--- a/t/t1100-commit-tree-options.sh
+++ b/t/t1100-commit-tree-options.sh
@@ -40,6 +40,6 @@ test_expect_success \
 
 test_expect_success \
     'compare commit' \
-    'diff expected commit'
+    'test_cmp expected commit'
 
 test_done