Straightforward verification

Expect Hash to call to_a. This test is successful.

 require 'spec_helper' describe do it do expect_any_instance_of(Hash).to receive(:to_a) { name: 'John' }.to_a end end

Unable to validate method chain

But what if you want to validate your method chain?

For example, Hash.to_a.to_s you write Hash.to_a.to_s . It is useless even if you expect to_s for Hash.

 require 'spec_helper' describe do it do expect_any_instance_of(Hash).to receive(:to_s) { name: 'John' }.to_a.to_s end end

Because at the time of Hash.to_a, the class is changed to Array.

 { name: 'John' }.to_a.class # => Array

solution

In this case you can expect to_s for Array.

 require 'spec_helper' describe do it do expect_any_instance_of(Array).to receive(:to_s) { name: 'John' }.to_a.to_s end end

Verify all

If you want to verify the entire method chain, you can expect both.

 require 'spec_helper' describe do it do expect_any_instance_of(Hash).to receive(:to_a) expect_any_instance_of(Array).to receive(:to_s) { name: 'John' }.to_a.to_s end end

environment

ruby 2.0.0
rspec-rails (2.14.2)

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Rspec | メソッドチェーンの検証方法 ( expect_any_instance_of )

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