[RFC PATCH v2 1/2] t3404: demonstrate that --edit-todo does not check for dropped commits

[Alban Gruin <alban.gruin@gmail.com>]

When set to "warn" or "error", `rebase.missingCommitCheck' would make
rebase -i warn if the user removed commits from the todo list to prevent
mistakes.  Unfortunately, rebase --edit-todo don't take it into account.

This adds three tests to t3404 to demonstrate this.  The first one is
not broken, as when `rebase.missingCommitsCheck' is not set, nothing in
particular must be done towards dropped commits.  The two others are
broken, demonstrating the problem.

The tests for `rebase.missingCommitsCheck = warn' and
`rebase.missingCommitsCheck = error' have a similar structure.  First,
we start a rebase with an incorrect command on the first line.  Then, we
edit the todo list, removing the first and the last lines.  This
demonstrates that `--edit-todo' notices dropped commits, but not when
the command is incorrect.  Then, we restore the original todo list, and
edit it to remove the last line.  This demonstrates that if we add a
commit after the initial edit, then remove it, `--edit-todo' will notice
that it has been dropped.  Then, the actual rebase takes place.

Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
---
 t/t3404-rebase-interactive.sh | 75 +++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index d2dfbe46b9..be8badf7b3 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -1353,6 +1353,81 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = error' '
 	test B = $(git cat-file commit HEAD^ | sed -ne \$p)
 '
 
+test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = ignore' '
+	test_config rebase.missingCommitsCheck ignore &&
+	rebase_setup_and_clean missing-commit &&
+	set_fake_editor &&
+	FAKE_LINES="break 1 2 3 4 5" git rebase -i --root &&
+	FAKE_LINES="1 2 3 4" git rebase --edit-todo 2>actual &&
+	git rebase --continue 2>actual &&
+	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
+	test_i18ngrep \
+		"Successfully rebased and updated refs/heads/missing-commit" \
+		actual
+'
+
+test_expect_failure 'rebase --edit-todo respects rebase.missingCommitsCheck = warn' '
+	cat >expect <<-EOF &&
+	error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	Warning: some commits may have been dropped accidentally.
+	Dropped commits (newer to older):
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
+	To avoid this message, use "drop" to explicitly remove a commit.
+	EOF
+	tail -n4 expect >expect.2 &&
+	test_config rebase.missingCommitsCheck warn &&
+	rebase_setup_and_clean missing-commit &&
+	set_fake_editor &&
+	test_must_fail env FAKE_LINES="bad 1 2 3 4 5" \
+		git rebase -i --root &&
+	cp .git/rebase-merge/git-rebase-todo.backup orig &&
+	FAKE_LINES="2 3 4" git rebase --edit-todo 2>actual.2 &&
+	head -n5 actual.2 >actual &&
+	test_i18ncmp expect actual &&
+	cp orig .git/rebase-merge/git-rebase-todo &&
+	FAKE_LINES="1 2 3 4" git rebase --edit-todo 2>actual.2 &&
+	head -n4 actual.2 >actual &&
+	test_i18ncmp expect.2 actual &&
+	git rebase --continue 2>actual &&
+	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
+	test_i18ngrep \
+		"Successfully rebased and updated refs/heads/missing-commit" \
+		actual
+'
+
+test_expect_failure 'rebase --edit-todo respects rebase.missingCommitsCheck = error' '
+	cat >expect <<-EOF &&
+	error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	Warning: some commits may have been dropped accidentally.
+	Dropped commits (newer to older):
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
+	To avoid this message, use "drop" to explicitly remove a commit.
+	EOF
+	tail -n4 expect >expect.2 &&
+	test_config rebase.missingCommitsCheck error &&
+	rebase_setup_and_clean missing-commit &&
+	set_fake_editor &&
+	test_must_fail env FAKE_LINES="bad 1 2 3 4 5" \
+		git rebase -i --root &&
+	cp .git/rebase-merge/git-rebase-todo.backup orig &&
+	test_must_fail env FAKE_LINES="2 3 4" \
+		git rebase --edit-todo 2>actual.2 &&
+	head -n5 actual.2 >actual &&
+	test_i18ncmp expect actual &&
+	cp orig .git/rebase-merge/git-rebase-todo &&
+	test_must_fail env FAKE_LINES="1 2 3 4" \
+		git rebase --edit-todo 2>actual.2 &&
+	head -n4 actual.2 >actual &&
+	test_i18ncmp expect.2 actual &&
+	cp orig .git/rebase-merge/git-rebase-todo &&
+	FAKE_LINES="1 2 3 4 drop 5" git rebase --edit-todo &&
+	git rebase --continue 2>actual &&
+	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
+	test_i18ngrep \
+		"Successfully rebased and updated refs/heads/missing-commit" \
+		actual
+'
+
 test_expect_success 'respects rebase.abbreviateCommands with fixup, squash and exec' '
 	rebase_setup_and_clean abbrevcmd &&
 	test_commit "first" file1.txt "first line" first &&
-- 
2.24.0.2.ga4a700ce8b