test: check pkparse with compressed ec

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/data_files/ec_bp256_prv.comp.pem b/tests/data_files/ec_bp256_prv.comp.pem
new file mode 100644
index 0000000..198d21d
--- /dev/null
+++ b/tests/data_files/ec_bp256_prv.comp.pem
@@ -0,0 +1,4 @@
+-----BEGIN EC PRIVATE KEY-----
+MFgCAQEEICFh1vLbdlJvpiwW81aoDwHzL3dnhLNqqZeZqLdmIID/oAsGCSskAwMC
+CAEBB6EkAyIAA3aMjK5KvKYwbbDtgbDEpiFcN4Bm7G1hbBRuE/HH34Cb
+-----END EC PRIVATE KEY-----