test: check pkparse with compressed ec

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/data_files/ec_bp512_prv.comp.pem b/tests/data_files/ec_bp512_prv.comp.pem
new file mode 100644
index 0000000..73b1c07
--- /dev/null
+++ b/tests/data_files/ec_bp512_prv.comp.pem
@@ -0,0 +1,6 @@
+-----BEGIN EC PRIVATE KEY-----
+MIGYAgEBBEA3LJd49p9ybLyj9KJo8WtNYX0QKA15pqApzVGHn+EBKTTf5TlUVTN9
+9pBtx9bS7qTbsgZcAij3Oz7XFkgOfXHSoAsGCSskAwMCCAEBDaFEA0IAAji37JK2
+HFxsf7wopOx1nUj81OLjdN79XElopU2+91EOUXiG+/w46jmqUpNZ1wpxVsNdPLrH
+zndr2yUd1kvOcSM=
+-----END EC PRIVATE KEY-----