diff --git a/.gitignore b/.gitignore
index 9eebbdd1..65a624e2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -112,9 +112,11 @@ venv.bak/
 
 .idea/*
 
-# Generated X.509 certificates, private keys, and PKCS12 container files
+# Generated X.509 certificates, private keys, and PKCS12 container files,
+# except sample certs used in tests
 *.pem
 *.der
+!tests/sample_certs/*.der
 *.key
 *.p12
 iso15118/shared/pki/iso15118_2
diff --git a/tests/sample_certs/contractLeafCert.der b/tests/sample_certs/contractLeafCert.der
new file mode 100644
index 00000000..0de0b566
Binary files /dev/null and b/tests/sample_certs/contractLeafCert.der differ
diff --git a/tests/sample_certs/moRootCACert.der b/tests/sample_certs/moRootCACert.der
new file mode 100644
index 00000000..3ddc1c03
Binary files /dev/null and b/tests/sample_certs/moRootCACert.der differ
diff --git a/tests/sample_certs/moSubCA1Cert.der b/tests/sample_certs/moSubCA1Cert.der
new file mode 100644
index 00000000..28589748
Binary files /dev/null and b/tests/sample_certs/moSubCA1Cert.der differ
diff --git a/tests/sample_certs/moSubCA2Cert.der b/tests/sample_certs/moSubCA2Cert.der
new file mode 100644
index 00000000..4b2e4656
Binary files /dev/null and b/tests/sample_certs/moSubCA2Cert.der differ