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.
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.
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