trailer: add tests for commands in config file

And add a few other tests for some special cases.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7513-interpret-trailers.sh

@@ -735,4 +735,129 @@ test_expect_success 'default "where" is now "after"' '
 	test_cmp expected actual
 '
 
+test_expect_success 'with simple command' '
+	git config trailer.sign.key "Signed-off-by: " &&
+	git config trailer.sign.where "after" &&
+	git config trailer.sign.ifExists "addIfDifferentNeighbor" &&
+	git config trailer.sign.command "echo \"A U Thor <author@example.com>\"" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Fixes: Z
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=22" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'with command using commiter information' '
+	git config trailer.sign.ifExists "addIfDifferent" &&
+	git config trailer.sign.command "echo \"\$GIT_COMMITTER_NAME <\$GIT_COMMITTER_EMAIL>\"" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Fixes: Z
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: C O Mitter <committer@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=22" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'with command using author information' '
+	git config trailer.sign.key "Signed-off-by: " &&
+	git config trailer.sign.where "after" &&
+	git config trailer.sign.ifExists "addIfDifferentNeighbor" &&
+	git config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Fixes: Z
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=22" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'setup a commit' '
+	echo "Content of the first commit." > a.txt &&
+	git add a.txt &&
+	git commit -m "Add file a.txt"
+'
+
+test_expect_success 'with command using $ARG' '
+	git config trailer.fix.ifExists "replace" &&
+	git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" --abbrev-commit --abbrev=14 \$ARG" &&
+	FIXED=$(git log -1 --oneline --format="%h (%s)" --abbrev-commit --abbrev=14 HEAD) &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-EOF &&
+		Fixes: $FIXED
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=HEAD" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'with failing command using $ARG' '
+	git config trailer.fix.ifExists "replace" &&
+	git config trailer.fix.command "false \$ARG" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-EOF &&
+		Fixes: Z
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=HEAD" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'with empty tokens' '
+	git config --unset trailer.fix.command &&
+	cat >expected <<-EOF &&
+
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer ":" --trailer ":test" >actual <<-EOF &&
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'with command but no key' '
+	git config --unset trailer.sign.key &&
+	cat >expected <<-EOF &&
+
+		sign: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers >actual <<-EOF &&
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'with no command and no key' '
+	git config --unset trailer.review.key &&
+	cat >expected <<-EOF &&
+
+		review: Junio
+		sign: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:Junio" >actual <<-EOF &&
+	EOF
+	test_cmp expected actual
+'
+
 test_done