Add test for non ascii x509 subject name

Signed-off-by: Agathiyan Bragadeesh <agathiyan.bragadeesh2@arm.com>
diff --git a/tests/data_files/server1.asciichars.crt b/tests/data_files/server1.asciichars.crt
new file mode 100644
index 0000000..824e46e
--- /dev/null
+++ b/tests/data_files/server1.asciichars.crt
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----