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require "spec_helper"
RSpec.describe "the spy family of methods" do
describe "spy" do
it "responds to arbitrary methods" do
expect(spy.respond_to?(:foo)).to be true
end
it "takes a name" do
expect(spy(:bacon_bits).inspect).to include("bacon_bits")
end
it "records called methods" do
expect(spy.tap { |s| s.foo }).to have_received(:foo)
end
it "takes a hash of method names and return values" do
expect(spy(:foo => :bar).foo).to eq(:bar)
end
it "takes a name and a hash of method names and return values" do
expect(spy(:bacon_bits, :foo => :bar).foo).to eq(:bar)
end
end
shared_examples_for "a verifying spy with a foo method" do
it "responds to methods on the verified object" do
expect(subject.respond_to?(:foo)).to be true
end
it "does not respond to methods that are not on the verified object" do
expect(subject.respond_to?(:other_method)).to be false
end
it "records called methods" do
expect(subject.tap { |s| s.foo }).to have_received(:foo)
end
it 'fails fast when `have_received` is passed an undefined method name' do
expect {
expect(subject).to have_received(:bar)
}.to fail_including("does not implement")
end
it 'fails fast when negative `have_received` is passed an undefined method name' do
expect {
expect(subject).to_not have_received(:bar)
}.to fail_including("does not implement")
end
end
describe "instance_spy" do
context "when passing a class object" do
let(:the_class) do
Class.new do
def foo
3
end
end
end
subject { instance_spy(the_class) }
it_behaves_like "a verifying spy with a foo method"
it "takes a class and a hash of method names and return values" do
expect(instance_spy(the_class, :foo => :bar).foo).to eq(:bar)
end
end
context "passing a class by string reference" do
DummyClass = Class.new do
def foo
3
end
end
let(:the_class) { "DummyClass" }
subject { instance_spy(the_class) }
it_behaves_like "a verifying spy with a foo method"
it "takes a class name string and a hash of method names and return values" do
expect(instance_spy(the_class, :foo => :bar).foo).to eq(:bar)
end
end
end
describe "object_spy" do
let(:the_class) do
Class.new do
def foo
3
end
end
end
let(:the_instance) { the_class.new }
subject { object_spy(the_instance) }
it_behaves_like "a verifying spy with a foo method"
it "takes an instance and a hash of method names and return values" do
expect(object_spy(the_instance, :foo => :bar).foo).to eq(:bar)
end
end
describe "class_spy" do
let(:the_class) do
Class.new do
def self.foo
3
end
end
end
subject { class_spy(the_class) }
it_behaves_like "a verifying spy with a foo method"
it "takes a class and a hash of method names and return values" do
expect(class_spy(the_class, :foo => :bar).foo).to eq(:bar)
end
end
end
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