Add test for .best returning threaded container.

Author: ioquatix

test/async/container.rb

@@ -26,10 +26,6 @@
 		end
 	end
 
-	it "can get best container class" do
-		expect(Async::Container.best_container_class).not.to be_nil
-	end
-	
 	with ".new" do
 		let(:container) {Async::Container.new}
 
@@ -38,4 +34,16 @@
 			container.stop
 		end
 	end
+	
+	with ".best" do
+		it "can get the best container class" do
+			expect(Async::Container.best_container_class).not.to be_nil
+		end
+		
+		it "can get the best container class if fork is not available" do
+			expect(subject).to receive(:fork?).and_return(false)
+			
+			expect(Async::Container.best_container_class).to be == Async::Container::Threaded
+		end
+	end
 end