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RSpec.describe "and_wrap_original" do
context "on a partial double" do
let(:klass) do
Class.new do
def results
(1..100).to_a
end
end
end
let(:instance) { klass.new }
shared_examples "using and_wrap_original" do
it "allows us to modify the results of the original method" do
expect {
allow_it.to receive(:results).and_wrap_original do |m|
m.call.first(10)
end
}.to change { instance.results.size }.from(100).to(10)
end
it "raises a name error if the method does not exist" do
expect {
allow_it.to receive(:no_results).and_wrap_original { |m| m.call }
instance.no_results
}.to raise_error NameError
end
it "passes along the original method" do
passed_method = nil
original_method = instance.method(:results)
allow_it.to receive(:results).and_wrap_original { |m| passed_method = m }
instance.results
expect(passed_method.call).to eq(original_method.call)
end
it "passes along the message arguments" do
values = nil
allow_it.to receive(:results).and_wrap_original { |_, *args| values = args }
instance.results(1, 2, 3)
expect(values).to eq [1, 2, 3]
end
it "passes along any supplied block" do
value = nil
allow_it.to receive(:results).and_wrap_original { |&b| value = b }
instance.results(&(block = proc {}))
expect(value).to eq block
end
it "ignores previous stubs" do
allow_it.to receive(:results) { "results" }
allow_it.to receive(:results).and_wrap_original { |m| m.call }
expect(instance.results).to_not eq "results"
end
it "can be constrained by specific arguments" do
allow_it.to receive(:results) { :all }
allow_it.to receive(:results).with(5).and_wrap_original { |m, n| m.call.first(n) }
expect(instance.results 5).to eq [1, 2, 3, 4, 5]
expect(instance.results).to eq :all
end
end
describe "allow(...).to receive(...).and_wrap_original" do
it_behaves_like "using and_wrap_original" do
let(:allow_it) { allow(instance) }
end
end
describe "allow_any_instance_of(...).to receive(...).and_wrap_original" do
it_behaves_like "using and_wrap_original" do
let(:allow_it) { allow_any_instance_of(klass) }
end
end
end
context "on a pure test double" do
let(:instance) { double :my_method => :my_value }
it 'raises an error' do
mock_expectation = allow(instance).to receive(:my_method)
expect {
mock_expectation.and_wrap_original
}.to raise_error(/pure test double.*and_wrap_original.*partial double/i)
end
it 'raises an error even if the double object responds to the message' do
mock_expectation = allow(instance).to receive(:inspect)
expect {
mock_expectation.and_wrap_original
}.to raise_error(/pure test double.*and_wrap_original.*partial double/i)
end
end
end
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