Remove a warning of "`&' interpreted as argument prefix" in test
Remove a warning of "instance variable @blah not initialized" in test

in context_test.rb
Remove a warning of "instance variable @blah not initialized" in test

in should_test.rb
Remove a warning of "instance variable @error not initialized" in test
Prevent a warning of "instance variable @error not initialized" in test
Remove a warning of "assigned but unused variable - child" in test