[PATCH v5 5/9] userdiff tests: explicitly test "default" pattern

Since 122aa6f9c0 (diff: introduce diff.<driver>.binary, 2008-10-05)
the internals of the userdiff.c code have understood a "default" name,
which is invoked as userdiff_find_by_name("default") and present in
the "builtin_drivers" struct. Let's test for this special case.

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 t/t4018-diff-funcname.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 9675bc17db..cefe329aea 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh

@@ -49,6 +49,7 @@ diffpatterns="
 	ruby
 	rust
 	tex
+	default
 	custom1
 	custom2
 	custom3

-- 
2.31.1.527.g9b8f7de2547