On your desktop, create a folder called test. Inside the test folder, create a folder called tester. Now open a finder window and navigate to a random location, like home, but not one of these folders.
Now open the AppleScript Editor and paste the code below into the AppleScript Editor input window (the top pane).
tell application "Finder" to set the target of the front Finder window to folder "tester" of folder "test" of desktop
The finder will automatically open the tester folder in the foremost open window.
A complete tutorial here: