Tidy up tests.

lib/async/dns/resolver.rb

@@ -103,7 +103,7 @@ def records_for(name, resource_classes)
 			end
 		end
 
-		if System.use_ipv6?
+		if System.ipv6?
 			ADDRESS_RESOURCE_CLASSES = [Resolv::DNS::Resource::IN::A, Resolv::DNS::Resource::IN::AAAA]
 		else
 			ADDRESS_RESOURCE_CLASSES = [Resolv::DNS::Resource::IN::A]

lib/async/dns/system.rb

@@ -23,7 +23,7 @@ def self.hosts_path
 			end
 		end
 
-		def self.use_ipv6?
+		def self.ipv6?
 			begin
 				list = Socket.ip_address_list
 			rescue NotImplementedError

test/async/dns/resolver.rb

@@ -30,7 +30,10 @@
 			addresses = resolver.addresses_for('google.com')
 
 			expect(addresses).to have_value(be_a Resolv::IPv4)
-			expect(addresses).to have_value(be_a Resolv::IPv6)
+
+			if Async::DNS::System.ipv6?
+				expect(addresses).to have_value(be_a Resolv::IPv6)
+			end
 		end
 
 		it "should recursively resolve CNAME records" do

test/async/dns/server.rb

@@ -47,17 +47,6 @@ def make_server(endpoint)
 				answer: be(:empty?)
 			)
 		end
-
-		it "should return IPv4 and IPv6 addresses" do
-			response = resolver.query("www.google.com", Resolv::DNS::Resource::IN::A)
-
-			expect(response).to have_attributes(
-				qr: be == 1,
-				rcode: be == Resolv::DNS::RCode::NoError,
-				question: have_attributes(size: be == 1),
-				answer: have_attributes(size: be > 0)
-			)
-		end
 	end
 
 	with 'a large response' do