Add CSIT tests for VES event-listener endpoint

Issue-ID: DCAEGEN2-1981
Change-Id: I6f71ec8a23dd0835540869dcac445834ebee2342
Signed-off-by: Aleksandra Maciaga <aleksandra.maciaga@nokia.com>
diff --git a/tests/dcaegen2/testcases/assets/certs/outdated.crt b/tests/dcaegen2/testcases/assets/certs/outdated.crt
new file mode 100644
index 0000000..8768cff
--- /dev/null
+++ b/tests/dcaegen2/testcases/assets/certs/outdated.crt
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----