Created first spec and made it pass. Takes a shift amount of 0 and an input phrase of one letter and outputs the input phrase unchanged. Fixed error in the spec-runner where the path to the scripts.js file was incorrect.
Adds second spec and rewords the it statement for the first spec for clarity. First test makes sure that a shift amount of 0 outputs the same phrase, and it only deals with a one-letter phrase. The second test also uses only a one-letter phrase but applies a shift amount of 1. Made both tests pass by implementing an array of alphabetical characters.
Adds and passes third spec which takes a 2 letter phrase and a shift amount of 0 and outputs the encoded multi-letter phrase. Implemented a loop to step through each character in the input phrase, encode it, and append it to an empty string variable to be returned.