Allow the config block to return a different wrapper. Fixes #43.

lib/async/http/faraday/clients.rb

@@ -38,8 +38,8 @@ def close
 				# @parameter endpoint [IO::Endpoint::Generic] The endpoint to create the client for.
 				def make_client(endpoint)
 					client = Client.new(endpoint, **@options)
-					@block&.call(client)
-					return client
+
+					return @block&.call(client) || client
 				end
 
 				# Get a client for the given endpoint.

test/async/http/faraday/adapter.rb

@@ -165,7 +165,7 @@ def get_response(url = bound_url, path = '/index', adapter_options: {})
 
 				adapter = Faraday.new do |builder|
 					builder.adapter :async_http do |client|
-						config_block_invoked = true
+						config_block_invoked = true; client
 					end
 				end
 

test/async/http/faraday/clients.rb

@@ -4,10 +4,26 @@
 # Copyright, 2024, by Samuel Williams.
 
 require 'async/http/faraday/clients'
+require 'async/http/middleware/location_redirector'
 
 describe Async::HTTP::Faraday::PersistentClients do
 	let(:clients) {subject.new}
 
+	with "a block" do
+		let(:clients) do
+			subject.new do |client|
+				Async::HTTP::Middleware::LocationRedirector.new(client)
+			end
+		end
+
+		it "can wrap the client with middleware" do
+			endpoint = Async::HTTP::Endpoint.parse('http://example.com')
+			client = clients.make_client(endpoint)
+
+			expect(client).to be_a(Async::HTTP::Middleware::LocationRedirector)
+		end
+	end
+
 	with "#make_client" do
 		it "caches the client" do
 			endpoint = Async::HTTP::Endpoint.parse('http://example.com')