clean up

tests/helpers/git

@@ -8,6 +8,11 @@ if [ "${1:-}" = "push" ] && [ -n "${GIT_MOCK_FAIL_PUSH:-}" ]; then
   exit 1
 fi
 
+# Skip -c config arguments
+while [ "${1:-}" = "-c" ]; do
+  shift 2
+done
+
 case "$1" in
   clone)
     TARGET_DIR="${@: -1}"
@@ -17,6 +22,14 @@ case "$1" in
     ;;
   add|commit|push|config|init)
     ;;
+  diff)
+    # Default: exit 1 = has changes → proceed to commit
+    # GIT_MOCK_DIFF_NO_CHANGES=1 → exit 0 = no changes → "no change" path
+    if [ -n "${GIT_MOCK_DIFF_NO_CHANGES:-}" ]; then
+      exit 0
+    fi
+    exit 1
+    ;;
   rev-parse)
     echo "mock-sha-9876543210fedcba9876543210fedcba98765432"
     ;;