test: check pkparse with compressed ec

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/data_files/ec_256_prv.comp.pem b/tests/data_files/ec_256_prv.comp.pem
new file mode 100644
index 0000000..9ef8c97
--- /dev/null
+++ b/tests/data_files/ec_256_prv.comp.pem
@@ -0,0 +1,4 @@
+-----BEGIN EC PRIVATE KEY-----
+MFcCAQEEIEnJqMGMS4hWOMQxzx3xyZQTFgm1gNT9Q6DKsX2y8T7uoAoGCCqGSM49
+AwEHoSQDIgADd3Jlb4FLOZJ51eHxeB+sbwmaPFyhsONTUYNLCLZeC1c=
+-----END EC PRIVATE KEY-----