These tests don't add anything valuable about the execution of the method. We may want to check the intention of the method.

```ruby
describe ".lookup" do
  it "delegates the lookup to a new client" do
    client = mock()
    client.expects(:lookup).with("example.com").returns(:result)
    Client.any_instance.expect(:new).returns(client)

    expect(described_class.lookup("example.com")).to eq(:result)
  end
end
```