Simple ruby stubbing

Opens up Object to add instance and class methods called instance_stub.

Stubbing all instances of a class

To stub a method universally (probably a bad idea to actually use):

String.instance_stub :to_s, "Bananas"
"Apples".to_s # "Bananas"

You can also stub a method locally to a block:

String.instance_stub :to_s, "Bananas" do
  "Apples".to_s # Bananas
end
"Apples".to_s # "Apples"

Stubbing a method for just one instance of an object

x = "Apples"
y = "Pears"

x.instance_stub :to_s, "Bananas"

x.to_s # Bananas
y.to_s # Pears

Development

Tests are done via minitest. Should be this simple:

bundle install
bundle exec rake test