cp -r /home/server/folder/test /home/server/
To copy all files, including hidden files use:
cp -r /home/server/folder/test/. /home/server/
As I understand, you want to recursively copy test directory into /home/server/ path...
/home/server/
This can be done as:
-cp -rf /home/server/folder/test/* /home/server/
Hope this helps