ruby 在RSpec中使用哈希来检查不同的变量/值组合

Posted 2021-05-15

# Using hashes in RSpec to check different variable/value combinations
# Often in RSpec, you want to check all different combinations of values for a number of variables, such as in the following example:

RSpec.describe RealStateWorker do
  context "when active is true and rented is true" do
    it { expect(something).to eq(something) }
  end

  context "when active is true and rented is false" do
    it { expect(something).to eq(something) }
  end

  context "when active is false and rented is true" do
    it { expect(something).to eq(something) }
  end

  context "when active is false and rented is false" do
    it { expect(something).to eq(something) }
  end
end


# Because each variable has two possible values, there are four combinations to test. But, what if we had more variables? This can very quickly grow out of hand. Using hashes is a concise way of managing this:

RSpec.describe RealStateWorker do
  scenarios = [
    { active: true,   rented: true,  expected_result: :something      },
    { active: true,   rented: true,  expected_result: :something_else },
    { active: true,   rented: false, expected_result: :something      },
    { active: true,   rented: false, expected_result: :something_else },
    { active: false,  rented: true,  expected_result: :something      },
    { active: false,  rented: true,  expected_result: :something_else },
    { active: false,  rented: false, expected_result: :something      },
    { active: false,  rented: false, expected_result: :something_else }
  ]

  scenarios.each do |scenario|
    context "when active is #{scenario[:active]} and rented is #{scenario[:rented]}" do
      it "is #{expected_result}" do
        expect(something).to eq(scenarios[:expected_result])
      end
    end
  end
end