Fix failing spec
Convert specs to RSpec 3.1.7 syntax with Transpec

This conversion is done by Transpec 2.3.7 with the following command:
    transpec

* 49 conversions
    from: obj.should
      to: expect(obj).to

* 27 conversions
    from: == expected
      to: eq(expected)

* 7 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 6 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 1 conversion
    from: === expected
      to: be === expected

* 1 conversion
    from: Klass.any_instance.should_receive(:message)
      to: expect_any_instance_of(Klass).to receive(:message)

* 1 conversion
    from: lambda { }.should
      to: expect { }.to

For more details: https://github.com/yujinakayama/transpec#supported-conversions