Revert "Remove unused test data files"

This reverts commit ef24980e667debd0cb8f1f26218c452bacbbe084.
diff --git a/tests/data_files/server5-ss-forgeca.crt b/tests/data_files/server5-ss-forgeca.crt
new file mode 100644
index 0000000..bfd7b70
--- /dev/null
+++ b/tests/data_files/server5-ss-forgeca.crt
@@ -0,0 +1,11 @@
+-----BEGIN CERTIFICATE-----
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+gZyyk/wZpswb53ZaIP2XsJiJ/CPMCCVq
+-----END CERTIFICATE-----