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require 'spec_helper'
module RSpec
module Mocks
describe "a double _not_ acting as a null object" do
before(:each) do
@double = Spy.double('non-null object')
end
it "says it does not respond to messages it doesn't understand" do
expect(@double).not_to respond_to(:foo)
end
it "says it responds to messages it does understand" do
Spy.on(@double, :foo)
expect(@double).to respond_to(:foo)
end
it "raises an error when interpolated in a string as an integer" do
expect { "%i" % @double }.to raise_error(TypeError)
end
end
describe "a double acting as a null object" do
before(:each) do
@double = Spy.double('null object').as_null_object
end
it "says it responds to everything" do
expect(@double).to respond_to(:any_message_it_gets)
end
it "allows explicit stubs" do
Spy.on(@double, :foo) { "bar" }
expect(@double.foo).to eq("bar")
end
it "allows explicit expectation" do
spy = Spy.on(@double, :something)
@double.something
expect(spy).to have_been_called
end
it 'continues to return self from an explicit expectation' do
spy = Spy.on(@double, :bar)
expect(@double.foo.bar).to be(@double)
expect(spy).to have_been_called
end
it 'returns an explicitly stubbed value from an expectation with no implementation' do
spy = Spy.on(@double, :foo => "bar")
expect(@double.foo).to eq("bar")
expect(spy).to have_been_called
end
it "can be interpolated in a string as an integer" do
# This form of string interpolation calls
# @double.to_int.to_int.to_int...etc until it gets an integer,
# and thus gets stuck in an infinite loop unless our double
# returns an int value from #to_int.
expect(("%i" % @double)).to eq("0")
end
end
describe "#as_null_object" do
it "sets the object to null_object" do
obj = Spy.double('anything').as_null_object
expect(obj).to be_null_object
end
end
describe "#null_object?" do
it "defaults to false" do
obj = Spy.double('anything')
expect(obj).not_to be_null_object
end
end
end
end
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