diff --git a/tests/data_files/test-int-ca3.key b/tests/data_files/test-int-ca3.key
new file mode 100644
index 0000000..1bcc711
--- /dev/null
+++ b/tests/data_files/test-int-ca3.key
@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIC9zTt8jgjBlbq+qCsGj6uclaKLYBqxYSmUiuBdM1KG9oAoGCCqGSM49
+AwEHoUQDQgAE732fWHLNPMPsP1U1ibXvb55erlEVMlpXBGsj+KYwVqU1XCmW9Z9h
+hP7X/5js/DX92J/utoHyjUtVpQOzdTrbsQ==
+-----END EC PRIVATE KEY-----