[PATCH v3 16/35] userdiff tests: do config teardown in test_diff_funcname()

Do a teardown of any custom "diff.<what>.x?funcname" config after a
test_diff_funcname() test runs. Nothing currently uses this, but a
follow-up commit will start setting custom config before certain
tests. Centralizing this teardown makes the tests simpler.

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 t/t4018-diff-funcname.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 7fc4291f4be..496313fc900 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh

@@ -123,6 +123,13 @@ test_diff_funcname () {
 		git diff -U1 "$what" >diff &&
 		last_diff_context_line diff >actual &&
 		test_cmp expected actual
+	' &&
+
+	test_expect_success "teardown: $desc" '
+		# In case any custom config was set immediately before
+		# the test itself in the test file
+		test_unconfig "diff.$what.funcname" &&
+		test_unconfig "diff.$what.xfuncname"
 	'
 }
 

-- 
2.30.0.284.gd98b1dd5eaa7