```ruby
module DropboxApi
  describe Client do
    it 'can have custom connection middleware' do
      # Mock middleware
      MiddlewareStart = Class.new
      MiddlewareMiddle = Class.new
      MiddlewareEnd = Class.new

      # Attach a dummy endpoint that will return the internal connection builder
      connection_builder_endpoint = Struct.new(:connection_builder)
      Client.add_endpoint :connection_builder, connection_builder_endpoint

      client = Client.new

      # Configure middleware
      client.middleware.prepend { |faraday| faraday.use MiddlewareStart }
      client.middleware.append { |faraday| faraday.use MiddlewareEnd }
      client.middleware.adapter = :net_http_persistent

      # Insert middleware as an endpoint might
      connection = client.connection_builder.build('http://example.org') do |faraday|
        faraday.use MiddlewareMiddle
      end

      expect(connection.builder.handlers).to eq [
        MiddlewareStart,
        MiddlewareMiddle,
        MiddlewareEnd,
        Faraday::Adapter::NetHttpPersistent
      ]
    end
  end
end
```

Fix tests so they pass on Faraday 1.0
user
```ruby
module DropboxApi
  describe Client do
    it 'can have custom connection middleware' do
      # Mock middleware
      MiddlewareStart = Class.new
      MiddlewareMiddle = Class.new
      MiddlewareEnd = Class.new

      # Attach a dummy endpoint that will return the internal connection builder
      connection_builder_endpoint = Struct.new(:connection_builder)
      Client.add_endpoint :connection_builder, connection_builder_endpoint

      client = Client.new

      # Configure middleware
      client.middleware.prepend { |faraday| faraday.use MiddlewareStart }
      client.middleware.append { |faraday| faraday.use MiddlewareEnd }
      client.middleware.adapter = :net_http_persistent

      # Insert middleware as an endpoint might
      connection = client.connection_builder.build('http://example.org') do |faraday|
        faraday.use MiddlewareMiddle
      end

      # Workaround the API changes Faraday introduced in 1.0 :(
      if Faraday::VERSION.start_with? "0."
        expect(connection.builder.handlers).to eq [
          MiddlewareStart,
          MiddlewareMiddle,
          MiddlewareEnd,
          Faraday::Adapter::NetHttpPersistent
        ]
      else
        expected = Faraday::RackBuilder.new(
          [MiddlewareStart, MiddlewareMiddle, MiddlewareEnd],
          Faraday::Adapter::NetHttpPersistent
        )

        expect(connection.builder).to eq(expected)
      end
    end
  end
end
```
assistant