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/test-int-ca2.key b/tests/data_files/test-int-ca2.key
new file mode 100644
index 0000000..ef3798c
--- /dev/null
+++ b/tests/data_files/test-int-ca2.key
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MF8CAQEEGFgy1xMAKfxIVYM/GIkSort30RcWwJOv3aAKBggqhkjOPQMBAaE0AzIA
+BBfzcOFR/YLf1lDCbXSkbMrHpWOp4E6X8NVw7ZSzE9l3sAQgICBw0KHkJVSJMbHU
+Rg==
+-----END EC PRIVATE KEY-----