EDITOR=./editor git commit --amend
'
+test_expect_success 'set up editor' '
+ cat >editor <<-\EOF &&
+ #!/bin/sh
+ sed -e "s/unamended/amended/g" <"$1" >"$1-"
+ mv "$1-" "$1"
+ EOF
+ chmod 755 editor
+'
+
+test_expect_success 'amend without launching editor' '
+ echo unamended >expect &&
+ git commit --allow-empty -m "unamended" &&
+ echo needs more bongo >file &&
+ git add file &&
+ EDITOR=./editor git commit --no-edit --amend &&
+ git diff --exit-code HEAD -- file &&
+ git diff-tree -s --format=%s HEAD >msg &&
+ test_cmp expect msg
+'
+
+test_expect_success '--amend --edit' '
+ echo amended >expect &&
+ git commit --allow-empty -m "unamended" &&
+ echo bongo again >file &&
+ git add file &&
+ EDITOR=./editor git commit --edit --amend &&
+ git diff-tree -s --format=%s HEAD >msg &&
+ test_cmp expect msg
+'
+
+test_expect_success '-m --edit' '
+ echo amended >expect &&
+ git commit --allow-empty -m buffer &&
+ echo bongo bongo >file &&
+ git add file &&
+ EDITOR=./editor git commit -m unamended --edit &&
+ git diff-tree -s --format=%s HEAD >msg &&
+ test_cmp expect msg
+'
+
test_expect_success '-m and -F do not mix' '
echo enough with the bongos >file &&
test_must_fail git commit -F msg -m amending .