ECC-1742: Tests

Author: shahramn

gribapi/gribapi.py

@@ -1127,11 +1127,13 @@ def grib_clone(msgid_src, headers_only=False):
 
     Create a copy of a given message (\em msgid_src) resulting in a new
     message in memory (\em msgid_dest) identical to the original one.
+    If the headers_only option is enabled, the clone will not contain
+    the Bitmap and Data sections
 
     \b Examples: \ref grib_clone.py "grib_clone.py"
 
     @param msgid_src    id of message to be cloned
-    @param headers_only whether or not to load the message with the headers only
+    @param headers_only whether or not to clone the message with the headers only
     @return             id of clone
     @exception CodesInternalError
     """

tests/test_eccodes.py

@@ -356,6 +356,9 @@ def test_grib_clone_headers_only():
     with open(TEST_GRIB_ERA5_DATA, "rb") as f:
         msgid1 = eccodes.codes_grib_new_from_file(f)
         msgid2 = eccodes.codes_clone(msgid1, headers_only=True)
+        msg1_size = eccodes.codes_get_message_size(msgid1)
+        msg2_size = eccodes.codes_get_message_size(msgid2)
+        assert msg1_size > msg2_size
         assert eccodes.codes_get(msgid1, "totalLength") == 14752
         assert eccodes.codes_get(msgid2, "totalLength") == 112
         assert eccodes.codes_get(msgid1, "bitsPerValue") == 16