:[] Create a mock against :[] .
Example
describe 'Mock Hash Test' do let(:hash) { { a: 1, b: 2, c: 3} } before do allow(hash).to receive(:[]).with(:a).and_return('Over written!') end it { expect(hash[:a]).to eq 'Over written!' } end
result
Mock Hash Test should eq "Over written!" 1 examples, 0 failures
problem
However, in this way, the verification against b: and c: that are not mocking is angry. and_call_original problem is solved by using and_call_original .
Example
describe 'Mock Hash Test' do let(:hash) { { a: 1, b: 2, c: 3} } before do allow(hash).to receive(:[]).and_call_original allow(hash).to receive(:[]).with(:a).and_return('Over written!') end it { expect(hash[:a]).to eq 'Over written!' } it { expect(hash[:b]).to eq 2 } it { expect(hash[:c]).to eq 3 } end
result
Mock Hash Test should eq "Over written!" should eq 3 should eq 2 3 examples, 0 failures
Supplement
In this case, "Make later" has higher priority for mocks. So and_return you reverse the lines of and_return and and_call_original , the verification will fail.
reference
environment
- rspec (3.4.0)
- rspec-core (3.4.4)
- rspec-mocks (3.4.1)
- rspec-rails (3.4.2)
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