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module RSpec
module Mocks
RSpec.describe InstanceMethodStasher do
class ExampleClass
def hello
:hello_defined_on_class
end
end
def singleton_class_for(obj)
class << obj; self; end
end
def stasher_for(obj, method_name)
InstanceMethodStasher.new(obj, method_name)
end
it "stashes the current implementation of an instance method so it can be temporarily replaced" do
obj = Object.new
def obj.hello; :hello_defined_on_singleton_class; end;
stashed_method = stasher_for(obj, :hello)
stashed_method.stash
with_isolated_stderr { def obj.hello; :overridden_hello; end }
expect(obj.hello).to eql :overridden_hello
stashed_method.restore
expect(obj.hello).to eql :hello_defined_on_singleton_class
end
it "stashes private instance methods" do
obj = Object.new
def obj.hello; :hello_defined_on_singleton_class; end;
singleton_class_for(obj).__send__(:private, :hello)
stashed_method = stasher_for(obj, :hello)
stashed_method.stash
with_isolated_stderr { def obj.hello; :overridden_hello; end }
stashed_method.restore
expect(obj.send(:hello)).to eql :hello_defined_on_singleton_class
end
it "only stashes methods directly defined on the given class, not its ancestors" do
obj = ExampleClass.new
stashed_method = stasher_for(obj, :hello)
stashed_method.stash
def obj.hello; :overridden_hello; end;
expect(obj.hello).to eql :overridden_hello
stashed_method.restore
expect(obj.hello).to eql :overridden_hello
end
it "does not unnecessarily create obfuscated aliased methods", :if => (RUBY_VERSION.to_f > 1.8) do
obj = Object.new
def obj.hello; :hello_defined_on_singleton_class; end;
stashed_method = stasher_for(obj, :hello)
stashed_method.stash
expect(obj.methods.grep(/rspec/)).to eq([])
end
it "undefines the original method", :if => (RUBY_VERSION.to_f > 1.8) do
obj = Object.new
def obj.hello; :hello_defined_on_singleton_class; end;
stashed_method = stasher_for(obj, :hello)
stashed_method.stash
expect(obj.methods).not_to include(:hello)
expect(obj).not_to respond_to(:hello)
end
end
end
end
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