[PATCH v2 2/2] t3200: verify "branch --list" sanity when rebasing from detached HEAD

[Kaartic Sivaraam <kaartic.sivaraam@gmail.com>]

From: Eric Sunshine <sunshine@sunshineco.com>

"git branch --list" shows an in-progress rebase as:

  * (no branch, rebasing <branch>)
    master
    ...

However, if the rebase is started from a detached HEAD, then there is no
<branch>, and it would attempt to print a NULL pointer. The previous
commit fixed this problem, so add a test to verify that the output is
sane in this situation.

Note that the "detached HEAD" test case might actually fail in some cases
as the actual output of "git branch --list" might contain remote branch
names which is not considered by the test case as it is rare to happen
in the test environment.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
---
 t/t3200-branch.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 503a88d02..738b5eb22 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -6,6 +6,7 @@
 test_description='git branch assorted tests'
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-rebase.sh
 
 test_expect_success 'prepare a trivial repository' '
 	echo Hello >A &&
@@ -1246,6 +1247,29 @@ test_expect_success '--merged is incompatible with --no-merged' '
 	test_must_fail git branch --merged HEAD --no-merged HEAD
 '
 
+test_expect_success '--list during rebase' '
+	test_when_finished "reset_rebase" &&
+	git checkout master &&
+	FAKE_LINES="1 edit 2" &&
+	export FAKE_LINES &&
+	set_fake_editor &&
+	git rebase -i HEAD~2 &&
+	git branch --list >actual &&
+	test_i18ngrep "rebasing master" actual
+'
+
+test_expect_success '--list during rebase from detached HEAD' '
+	test_when_finished "reset_rebase && git checkout master" &&
+	git checkout HEAD^0 &&
+	oid=$(git rev-parse --short HEAD) &&
+	FAKE_LINES="1 edit 2" &&
+	export FAKE_LINES &&
+	set_fake_editor &&
+	git rebase -i HEAD~2 &&
+	git branch --list >actual &&
+	test_i18ngrep "rebasing detached HEAD $oid" actual
+'
+
 test_expect_success 'tracking with unexpected .fetch refspec' '
 	rm -rf a b c d &&
 	git init a &&
-- 
2.17.0.rc0.231.g781580f06