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module RSpec
module Mocks
RSpec.describe 'and_invoke' do
let(:obj) { double('obj') }
context 'when a block is passed' do
it 'raises ArgumentError' do
expect {
allow(obj).to receive(:foo).and_invoke('bar') { 'baz' }
}.to raise_error(ArgumentError, /implementation block/i)
end
end
context 'when no argument is passed' do
it 'raises ArgumentError' do
expect { allow(obj).to receive(:foo).and_invoke }.to raise_error(ArgumentError)
end
end
context 'when a non-callable are passed in any position' do
let(:non_callable) { nil }
let(:callable) { lambda { nil } }
it 'raises ArgumentError' do
error = [ArgumentError, "Arguments to `and_invoke` must be callable."]
expect { allow(obj).to receive(:foo).and_invoke(non_callable) }.to raise_error(*error)
expect { allow(obj).to receive(:foo).and_invoke(callable, non_callable) }.to raise_error(*error)
end
end
context 'when calling passed callables' do
let(:dbl) { double }
it 'passes the arguments into the callable' do
expect(dbl).to receive(:square_then_cube).and_invoke(lambda { |i| i ** 2 },
lambda { |i| i ** 3 })
expect(dbl.square_then_cube(2)).to eq 4
expect(dbl.square_then_cube(2)).to eq 8
end
end
end
end
end
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