class RSpec::Mocks::Configuration

isolated unit test will prevent you from being able to isolate it!
test suite, with all production code loaded. Setting this for an
constant. You probably only want to set this when running your entire
`instance_double` or `class_double` is given the name of an undefined
When this is set to true, an error will be raised when

def verify_doubled_constant_names=(val)
  @verify_doubled_constant_names = val
end