Configure connection after setting adapter

Setting the adapter after calling the configure_connection blocks makes
it impossible to configure the adapter with options.

lib/twilio-ruby/http/http_client.rb

@@ -40,8 +40,8 @@ def _request(request) # rubocop:disable Metrics/MethodLength
           f.options.open_timeout = request.timeout || @timeout
           f.options.timeout = request.timeout || @timeout
 
-          @configure_connection_blocks.each { |block| block.call(f) }
           f.adapter @adapter
+          @configure_connection_blocks.each { |block| block.call(f) }
         end
 
         @last_request = request

spec/http/http_client_spec.rb

@@ -20,15 +20,34 @@
       blocks_spy.second_block_called(f)
     end
 
-    expect(Faraday).to receive(:new).and_yield(@connection).and_return(@connection)
-    allow_any_instance_of(Faraday::Connection).to receive(:send).and_return(double('response', status: 301, body: {}, headers: {}))
+    allow(Faraday).to receive(:new).and_yield(@connection).and_return(@connection)
+    allow(@connection).to receive(:send).and_return(double('response', status: 301, body: {}, headers: {}))
 
     @client.request('host', 'port', 'GET', 'url', nil, nil, {}, ['a', 'b'])
 
     expect(blocks_spy).to have_received(:first_block_called).with(@connection)
     expect(blocks_spy).to have_received(:second_block_called).with(@connection)
   end
 
+  it 'should allow the configuration block to set the connection adapter' do
+    @client = Twilio::HTTP::Client.new
+    @connection = Faraday::Connection.new
+
+    stub_const('TestAdapter', Class.new(Faraday::Adapter))
+    Faraday::Adapter.register_middleware test_adapter: TestAdapter
+
+    @client.configure_connection do |f|
+      f.adapter :test_adapter
+    end
+
+    allow(Faraday).to receive(:new).and_yield(@connection).and_return(@connection)
+    allow(@connection).to receive(:send).and_return(double('response', status: 301, body: {}, headers: {}))
+
+    @client.request('host', 'port', 'GET', 'url', nil, nil, {}, ['a', 'b'])
+
+    expect(@connection.adapter).to eq TestAdapter
+  end
+
   it 'should allow setting a global timeout' do
     @client = Twilio::HTTP::Client.new(timeout: 10)
     @connection = Faraday::Connection.new