Rework enabled? to check for Backend::Interface.

lib/metrics/backend.rb

@@ -6,18 +6,20 @@
 require 'console/event/failure'
 
 module Metrics
-	# Require a specific trace backend.
-	def self.require_backend(env = ENV)
-		if backend = env['METRICS_BACKEND']
-			begin
-				require(backend)
-			rescue LoadError => error
-				::Console::Event::Failure.for(error).emit(self, "Unable to load metrics backend!", backend: backend, severity: :warn)
+	module Backend
+		# Require a specific trace backend.
+		def self.require_backend(env = ENV)
+			if backend = env['METRICS_BACKEND']
+				begin
+					require(backend)
+				rescue LoadError => error
+					::Console::Event::Failure.for(error).emit(self, "Unable to load metrics backend!", backend: backend, severity: :warn)
+				end
+
+				Metrics.extend(Backend::Interface)
 			end
-
-			Metrics.extend(Backend::Interface)
 		end
 	end
 end
 
-Metrics.require_backend
+Metrics::Backend.require_backend

lib/metrics/provider.rb

@@ -8,7 +8,7 @@
 module Metrics
 	# @returns [Boolean] Whether there is an active backend.
 	def self.enabled?
-		self.const_defined?(:Backend)
+		Backend.const_defined?(:Interface)
 	end
 
 	module Provider

test/metrics/backend.rb

@@ -8,7 +8,7 @@
 
 require "sus/fixtures/console"
 
-describe Metrics do
+describe Metrics::Backend do
 	with ".require_backend" do
 		include_context Sus::Fixtures::Console::CapturedLogger