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This will check out the files and place them in the "my_testdir" subdirectory. Within this there should be a directory with raw data, a "redux" directory containing only a mock Magellan observing catalog file, and a brief observing "log" indicating which raw files are which exposure types. With these files and the cookbook instructions you should be able to reduce a single spectrum from start to finish.
NEW: Also included in the distribution is a set of prism-mode data (courtesy of Adam Burgasser) that may be used for testing in this mode. The code may be found in the LowDisp subdirectory of my_testdir. If you already have the echelle test data and would like to download just the longslit data package, cd into my_testdir or whatever you named your directory) and type svn update.