diff --git a/letsencrypt-auto-source/tests/signing.key b/letsencrypt-auto-source/tests/signing.key
new file mode 100644
index 000000000..b9964d00c
--- /dev/null
+++ b/letsencrypt-auto-source/tests/signing.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----