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Contents
Feature: Wrapping the original implementation
Use `and_wrap_original` to modify a partial double's original response. This can be useful
when you want to utilise an external object but mutate its response. For example if an
API returns a large amount of data and for test purposes you'd like to trim it down. You can
also use it to configure the default response for most arguments, and then override that for
specific arguments using `with`.
Note: `and_wrap_original` is only supported on partial doubles, as normal test doubles do
not have an original implementation.
Background:
Given a file named "lib/api.rb" with:
"""ruby
class API
def self.solve_for(x)
(1..x).to_a
end
end
"""
Scenario: `and_wrap_original` wraps the original partial double response
Given a file named "spec/and_wrap_original_spec.rb" with:
"""ruby
require 'api'
RSpec.describe "and_wrap_original" do
it "responds as it normally would, modified by the block" do
expect(API).to receive(:solve_for).and_wrap_original { |m, *args| m.call(*args).first(5) }
expect(API.solve_for(100)).to eq [1,2,3,4,5]
end
end
"""
When I run `rspec spec/and_wrap_original_spec.rb`
Then the examples should all pass
Scenario: `and_wrap_original` can configure a default response that can be overridden for specific args
Given a file named "spec/and_wrap_original_spec.rb" with:
"""ruby
require 'api'
RSpec.describe "and_wrap_original" do
it "can be overridden for specific arguments using #with" do
allow(API).to receive(:solve_for).and_wrap_original { |m, *args| m.call(*args).first(5) }
allow(API).to receive(:solve_for).with(2).and_return([3])
expect(API.solve_for(20)).to eq [1,2,3,4,5]
expect(API.solve_for(2)).to eq [3]
end
end
"""
When I run `rspec spec/and_wrap_original_spec.rb`
Then the examples should all pass
Version data entries
5 entries across 5 versions & 1 rubygems