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diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
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+#!/bin/sh
+
+test_description='.mailmap configurations'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+ echo one >one &&
+ git add one &&
+ test_tick &&
+ git commit -m initial &&
+ echo two >>one &&
+ git add one &&
+ git commit --author "nick1 <bugs@company.xx>" -m second
+'
+
+cat >expect <<\EOF
+A U Thor (1):
+ initial
+
+nick1 (1):
+ second
+
+EOF
+
+test_expect_success 'No mailmap' '
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+cat >expect <<\EOF
+Repo Guy (1):
+ initial
+
+nick1 (1):
+ second
+
+EOF
+
+test_expect_success 'default .mailmap' '
+ echo "Repo Guy <author@example.com>" > .mailmap &&
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+# Using a mailmap file in a subdirectory of the repo here, but
+# could just as well have been a file outside of the repository
+cat >expect <<\EOF
+Internal Guy (1):
+ second
+
+Repo Guy (1):
+ initial
+
+EOF
+test_expect_success 'mailmap.file set' '
+ mkdir internal_mailmap &&
+ echo "Internal Guy <bugs@company.xx>" > internal_mailmap/.mailmap &&
+ git config mailmap.file internal_mailmap/.mailmap &&
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+cat >expect <<\EOF
+External Guy (1):
+ initial
+
+Internal Guy (1):
+ second
+
+EOF
+test_expect_success 'mailmap.file override' '
+ echo "External Guy <author@example.com>" >> internal_mailmap/.mailmap &&
+ git config mailmap.file internal_mailmap/.mailmap &&
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+cat >expect <<\EOF
+Repo Guy (1):
+ initial
+
+nick1 (1):
+ second
+
+EOF
+
+test_expect_success 'mailmap.file non-existant' '
+ rm internal_mailmap/.mailmap &&
+ rmdir internal_mailmap &&
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+cat >expect <<\EOF
+A U Thor (1):
+ initial
+
+nick1 (1):
+ second
+
+EOF
+test_expect_success 'No mailmap files, but configured' '
+ rm .mailmap &&
+ git shortlog HEAD >actual &&
+ test_cmp expect actual
+'
+
+# Extended mailmap configurations should give us the following output for shortlog
+cat >expect <<\EOF
+A U Thor <author@example.com> (1):
+ initial
+
+CTO <cto@company.xx> (1):
+ seventh
+
+Other Author <other@author.xx> (2):
+ third
+ fourth
+
+Santa Claus <santa.claus@northpole.xx> (2):
+ fifth
+ sixth
+
+Some Dude <some@dude.xx> (1):
+ second
+
+EOF
+
+test_expect_success 'Shortlog output (complex mapping)' '
+ echo three >>one &&
+ git add one &&
+ test_tick &&
+ git commit --author "nick2 <bugs@company.xx>" -m third &&
+
+ echo four >>one &&
+ git add one &&
+ test_tick &&
+ git commit --author "nick2 <nick2@company.xx>" -m fourth &&
+
+ echo five >>one &&
+ git add one &&
+ test_tick &&
+ git commit --author "santa <me@company.xx>" -m fifth &&
+
+ echo six >>one &&
+ git add one &&
+ test_tick &&
+ git commit --author "claus <me@company.xx>" -m sixth &&
+
+ echo seven >>one &&
+ git add one &&
+ test_tick &&
+ git commit --author "CTO <cto@coompany.xx>" -m seventh &&
+
+ mkdir internal_mailmap &&
+ echo "Committed <committer@example.com>" > internal_mailmap/.mailmap &&
+ echo "<cto@company.xx> <cto@coompany.xx>" >> internal_mailmap/.mailmap &&
+ echo "Some Dude <some@dude.xx> nick1 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
+ echo "Other Author <other@author.xx> nick2 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
+ echo "Other Author <other@author.xx> <nick2@company.xx>" >> internal_mailmap/.mailmap &&
+ echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
+ echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
+
+ git shortlog -e HEAD >actual &&
+ test_cmp expect actual
+
+'
+
+# git log with --pretty format which uses the name and email mailmap placemarkers
+cat >expect <<\EOF
+Author CTO <cto@coompany.xx> maps to CTO <cto@company.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author claus <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author santa <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick2 <nick2@company.xx> maps to Other Author <other@author.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick2 <bugs@company.xx> maps to Other Author <other@author.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick1 <bugs@company.xx> maps to Some Dude <some@dude.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author A U Thor <author@example.com> maps to A U Thor <author@example.com>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+EOF
+
+test_expect_success 'Log output (complex mapping)' '
+ git log --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+ test_cmp expect actual
+'
+
+# git blame
+cat >expect <<\EOF
+^3a2fdcb (A U Thor 2005-04-07 15:13:13 -0700 1) one
+7de6f99b (Some Dude 2005-04-07 15:13:13 -0700 2) two
+5815879d (Other Author 2005-04-07 15:14:13 -0700 3) three
+ff859d96 (Other Author 2005-04-07 15:15:13 -0700 4) four
+5ab6d4fa (Santa Claus 2005-04-07 15:16:13 -0700 5) five
+38a42d8b (Santa Claus 2005-04-07 15:17:13 -0700 6) six
+8ddc0386 (CTO 2005-04-07 15:18:13 -0700 7) seven
+EOF
+
+test_expect_success 'Blame output (complex mapping)' '
+ git blame one >actual &&
+ test_cmp expect actual
+'
+
+test_done