+test_expect_success 'merge-msg with nothing to merge' '
+
+ git config --unset-all merge.log
+ git config --unset-all merge.summary
+ git config merge.summary yes &&
+
+ (
+ cd remote &&
+ git checkout -b unrelated &&
+ test_tick &&
+ git fetch origin &&
+ git fmt-merge-msg <.git/FETCH_HEAD >../actual
+ ) &&
+
+ test_cmp /dev/null actual
+'
+
+cat >expected <<\EOF
+Merge tag 'tag-r3'
+
+* tag 'tag-r3':
+ Right #3
+ Common #2
+ Common #1
+EOF
+
+test_expect_success 'merge-msg tag' '
+
+ git config --unset-all merge.log
+ git config --unset-all merge.summary
+ git config merge.summary yes &&
+
+ git checkout master &&
+ test_tick &&
+ git fetch . tag tag-r3 &&
+
+ git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+ test_cmp expected actual
+'
+
+cat >expected <<\EOF
+Merge tags 'tag-r3' and 'tag-l5'
+
+* tag 'tag-r3':
+ Right #3
+ Common #2
+ Common #1
+
+* tag 'tag-l5':
+ Left #5
+ Left #4
+ Left #3
+ Common #2
+ Common #1
+EOF
+
+test_expect_success 'merge-msg two tags' '
+
+ git config --unset-all merge.log
+ git config --unset-all merge.summary
+ git config merge.summary yes &&
+
+ git checkout master &&
+ test_tick &&
+ git fetch . tag tag-r3 tag tag-l5 &&
+
+ git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+ test_cmp expected actual
+'
+
+cat >expected <<\EOF
+Merge branch 'left', tag 'tag-r3'
+
+* tag 'tag-r3':
+ Right #3
+ Common #2
+ Common #1
+
+* left:
+ Left #5
+ Left #4
+ Left #3
+ Common #2
+ Common #1
+EOF
+
+test_expect_success 'merge-msg tag and branch' '
+
+ git config --unset-all merge.log
+ git config --unset-all merge.summary
+ git config merge.summary yes &&
+
+ git checkout master &&
+ test_tick &&
+ git fetch . tag tag-r3 left &&
+
+ git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+ test_cmp expected actual
+'
+
+cat >expected <<\EOF
+Merge branch 'long'
+
+* long: (35 commits)
+EOF
+
+test_expect_success 'merge-msg lots of commits' '
+
+ git checkout master &&
+ test_tick &&
+ git fetch . long &&
+
+ i=29 &&
+ while test $i -gt 9
+ do
+ echo " $i" &&
+ i=$(($i-1))
+ done >>expected &&
+ echo " ..." >>expected
+
+ git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+ test_cmp expected actual
+'
+