[PATCH v4 1/8] t3416: tighten two tests

["Phillip Wood via GitGitGadget" <gitgitgadget@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Add a check for the correct error message to the tests that check we
require a single merge base so we can be sure the rebase failed for
the correct reason. Also rename the tests to reflect what they are
testing.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 t/t3416-rebase-onto-threedots.sh | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/t/t3416-rebase-onto-threedots.sh b/t/t3416-rebase-onto-threedots.sh
index 3e04802cb00..dc67d2308f3 100755
--- a/t/t3416-rebase-onto-threedots.sh
+++ b/t/t3416-rebase-onto-threedots.sh
@@ -97,13 +97,14 @@ test_expect_success 'rebase -i --onto main...' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase -i --onto main...side' '
+test_expect_success 'rebase --onto main...side requires a single merge-base' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
 	set_fake_editor &&
-	test_must_fail git rebase -i --onto main...side J
+	test_must_fail git rebase -i --onto main...side J 2>err &&
+	grep "need exactly one merge base" err
 '
 
 test_expect_success 'rebase --keep-base --onto incompatible' '
@@ -182,13 +183,14 @@ test_expect_success 'rebase -i --keep-base main topic from main' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase -i --keep-base main from side' '
+test_expect_success 'rebase --keep-base requires a single merge base' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
 	set_fake_editor &&
-	test_must_fail git rebase -i --keep-base main
+	test_must_fail git rebase -i --keep-base main 2>err &&
+	grep "need exactly one merge base with branch" err
 '
 
 test_done
-- 
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