Remove trailing whitespace
Loosen constrains of development dependencies
expect { }.not_to raise_error(SpecificErrorClass) is deprecated
Replace "be_false" with "be false"
Replace "be_true" with "be true"
Ensure predicate method returns true or false
File.exists? is a deprecated name, use File.exist?
Remove unused variables
Fix warning: uninitialized instance variable
Fix warning: ambiguous first argument
Fix warning: URI.escape is obsolete