Respect container count configuration. (#234)

* Insert `count` into default `container_options`. Fixes #233.

lib/falcon/environment/application.rb

@@ -49,12 +49,6 @@ def endpoint
 					authority: authority
 				)
 			end
-
-			# Number of instances to start.
-			# @returns [Integer | nil]
-			def count
-				nil
-			end
 		end
 	end
 end

lib/falcon/environment/rackup.rb

@@ -11,7 +11,7 @@ module Environment
 		# Provides an environment for hosting loading a Rackup `config.ru` file.
 		module Rackup
 			def rackup_path
-				'config.ru'
+				File.expand_path('config.ru', root)
 			end
 
 			def rack_app

lib/falcon/environment/server.rb

@@ -25,9 +25,15 @@ def authority
 				self.name
 			end
 
+			# Number of instances to start. By default (when nil), uses `Etc.nprocessors`.
+			# @returns [Integer | nil]
+			def count
+				nil
+			end
+
 			# Options to use when creating the container.
 			def container_options
-				{restart: true}
+				{restart: true, count: self.count}.compact
 			end
 
 			# The host that this server will receive connections for.

test/falcon/service/.server/hello/config.ru

@@ -0,0 +1,6 @@
+
+app = proc do |env|
+	[200, {}, ["Hello World"]]
+end
+
+run app

test/falcon/service/server.rb

@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2024, by Samuel Williams.
+
+require 'falcon/service/server'
+require 'falcon/configuration'
+require 'falcon/environment/server'
+require 'falcon/environment/rackup'
+
+describe Falcon::Service::Server do
+	let(:environment) do
+		Async::Service::Environment.new(Falcon::Environment::Server).with(
+			Falcon::Environment::Rackup,
+			name: 'hello',
+			root: File.expand_path('.server/hello', __dir__),
+			url: "http://localhost:0",
+		)
+	end
+
+	let(:server) do
+		subject.new(environment)
+	end
+
+	it "can create a server" do
+		expect(server).to be_a subject
+	end
+
+	it "can start and stop server" do
+		container = Async::Container.new
+
+		server.start
+		server.setup(container)
+		container.wait_until_ready
+
+		expect(container.group.running).to have_attributes(size: be == Etc.nprocessors)
+
+		server.stop
+		container.stop
+	end
+
+	with 'a limited count' do
+		let(:environment) do
+			Async::Service::Environment.new(Falcon::Environment::Server).with(
+				Falcon::Environment::Rackup,
+				name: 'hello',
+				root: File.expand_path('.server/hello', __dir__),
+				url: "http://localhost:0",
+				count: 1,
+			)
+		end
+
+		it "can start and stop server" do
+			container = Async::Container.new
+
+			server.start
+			server.setup(container)
+			container.wait_until_ready
+
+			expect(container.group.running).to have_attributes(size: be == 1)
+
+			server.stop
+			container.stop
+		end
+	end
+end