t6200-fmt-merge-msg: Exercise 'merge.log' to configure shortlog length

Add a test to exercise the 'merge.log' configuration option of 'git
fmt-merge-msg'. It controls the number of shortlog entries to display
in merge commit messages.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Thanks-to: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6200-fmt-merge-msg.sh b/t/t6200-fmt-merge-msg.sh
index 71f6cad3c2b8e8ed0b16d292f4922760901702ef..9b600a8717aaafca9fb8308c461e441af83e367b 100755 (executable)
--- a/t/t6200-fmt-merge-msg.sh
+++ b/t/t6200-fmt-merge-msg.sh
@@ -129,6 +129,54 @@ test_expect_success '[merge] summary/log configuration' '
        test_cmp expected actual2
 '
 
+test_expect_success 'setup: clear [merge] configuration' '
+       test_might_fail git config --unset-all merge.log &&
+       test_might_fail git config --unset-all merge.summary
+'
+
+test_expect_success 'setup FETCH_HEAD' '
+       git checkout master &&
+       test_tick &&
+       git fetch . left
+'
+
+test_expect_success 'merge.log=3 limits shortlog length' '
+       cat >expected <<-EOF &&
+       Merge branch ${apos}left${apos}
+
+       * left: (5 commits)
+         Left #5
+         Left #4
+         Left #3
+         ...
+       EOF
+
+       git -c merge.log=3 fmt-merge-msg <.git/FETCH_HEAD >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success 'merge.log=5 shows all 5 commits' '
+       cat >expected <<-EOF &&
+       Merge branch ${apos}left${apos}
+
+       * left:
+         Left #5
+         Left #4
+         Left #3
+         Common #2
+         Common #1
+       EOF
+
+       git -c merge.log=5 fmt-merge-msg <.git/FETCH_HEAD >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success 'merge.log=0 disables shortlog' '
+       echo "Merge branch ${apos}left${apos}" >expected
+       git -c merge.log=0 fmt-merge-msg <.git/FETCH_HEAD >actual &&
+       test_cmp expected actual
+'
+
 test_expect_success 'fmt-merge-msg -m' '
        echo "Sync with left" >expected &&
        cat >expected.log <<-EOF &&