Add some more x509_verify tests
- trust chain of depth 0
- invalid signature
- trust chain of depth 2
- multiple trusted CA's
diff --git a/tests/data_files/server7_int-ca.crt b/tests/data_files/server7_int-ca.crt
new file mode 100644
index 0000000..75c9dc6
--- /dev/null
+++ b/tests/data_files/server7_int-ca.crt
@@ -0,0 +1,29 @@
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