diff --git a/tests/data_files/cert_md2.csr b/tests/data_files/cert_md2.csr
new file mode 100644
index 0000000..a8c39bd
--- /dev/null
+++ b/tests/data_files/cert_md2.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/cert_md4.csr b/tests/data_files/cert_md4.csr
new file mode 100644
index 0000000..d8a3dbf
--- /dev/null
+++ b/tests/data_files/cert_md4.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/cert_md5.csr b/tests/data_files/cert_md5.csr
new file mode 100644
index 0000000..dc6792d
--- /dev/null
+++ b/tests/data_files/cert_md5.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----