The document discusses the self keyword in Ruby. It provides examples of how self refers to the enclosing class or module from within a class or module definition. It also shows how self refers to the instance of a class from within an instance method.
This document contains test code for integration and system tests. The integration test tests creating a new user and ensures it is redirected correctly. The system test tests creating a new app by filling in a form and clicking submit, asserting that the app count increases by one. Both test classes contain setup code that signs in a test user for the tests.
The document shows code that is counting the occurrences of spaces in a CSV file. It opens the file, reads each line, uses a regular expression to check for spaces, and increments a count for each unique space found. It then sorts and prints the final counts.
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