git diff --exit-code
'
+test_expect_success 'allow-empty --only ignores staged contents' '
+ echo changed-again >file &&
+ git add file &&
+ git commit --allow-empty --only -m "empty" &&
+ git cat-file blob HEAD:file >file.actual &&
+ test_cmp file.expect file.actual &&
+ git diff --exit-code
+'
+
test_expect_success 'set up editor' '
cat >editor <<-\EOF &&
#!/bin/sh