CI: Fetch object with part number

Linked: open-io/swift3#89
Jira: OS-572

tests/functional/s3-multipart.sh

@@ -98,6 +98,22 @@ if ${AWS} s3api get-object --bucket ${BUCKET} --key obj --if-match c9975699ef630
     false
 fi
 
+echo "Fetching object with part number"
+PART_FILE=$(mktemp -t part_XXXXXX.dat)
+dd if="${MULTI_FILE}" of="${PART_FILE}" count=5 bs=1M
+DATA=$(${AWS} s3api head-object --bucket ${BUCKET} --key obj --part-number 1)
+ETAG=$(echo $DATA | jq -r .ETag)
+[ "$ETAG" == '"c9975699ef630d1f3dfc7224b16d1a25-11"' ]
+CONTENT_LENGTH=$(jq -r ".ContentLength|tostring" <<< "$DATA")
+[ "$CONTENT_LENGTH" == '5242880' ]
+
+PART_META=$(${AWS} s3api get-object --bucket ${BUCKET} --key obj --if-match c9975699ef630d1f3dfc7224b16d1a25-11 --part-number 1 part)
+ETAG=$(jq -r ".ETag|tostring" <<< "$PART_META")
+[ "$ETAG" == '"c9975699ef630d1f3dfc7224b16d1a25-11"' ]
+CONTENT_LENGTH=$(jq -r ".ContentLength|tostring" <<< "$PART_META")
+[ "$CONTENT_LENGTH" == '5242880' ]
+diff "${PART_FILE}" part
+
 # Without swift3 etag properties
 openio --oio-ns "${OIO_NS}" --oio-account "${OIO_ACCOUNT}" object unset "${BUCKET}" obj --property x-object-sysmeta-swift3-etag --property x-object-sysmeta-container-update-override-etag
 DATA=$(${AWS} s3api head-object --bucket ${BUCKET} --key obj)