Fix Resolv specs to not depend on DNS

spec/ruby/library/resolv/get_address_spec.rb

@@ -7,17 +7,17 @@
   end
 
   it 'resolves localhost' do
-
-    localhost = Socket.getaddrinfo("127.0.0.1", nil)[0][2]
+    res = Resolv.new([Resolv::Hosts.new])
 
     lambda {
-      address = Resolv.getaddress(localhost)
+      address = res.getaddress("localhost")
     }.should_not raise_error(Resolv::ResolvError)
   end
-
-  it 'raises ResolvError given a bogus address' do
+
+  it 'raises ResolvError if the name can not be looked up' do
+    res = Resolv.new([])
     lambda {
-      address = Resolv.getaddress("should.raise.error.")
+      address = res.getaddress("should.raise.error.")
     }.should raise_error(Resolv::ResolvError)
   end
 

spec/ruby/library/resolv/get_addresses_spec.rb

@@ -7,14 +7,14 @@
   end
 
   it 'resolves localhost' do
-    localhost = Socket.getaddrinfo("127.0.0.1", nil)[0][2]
+    res = Resolv.new([Resolv::Hosts.new])
 
     addresses = nil
 
     lambda {
-      addresses = Resolv.getaddresses(localhost)
+      addresses = res.getaddresses("localhost")
     }.should_not raise_error(Resolv::ResolvError)
-    
+
     addresses.should_not == nil
     addresses.size.should > 0
   end

spec/ruby/library/resolv/get_name_spec.rb

@@ -6,11 +6,16 @@
   end
 
   it 'resolves 127.0.0.1' do
+    res = Resolv.new([Resolv::Hosts.new])
     lambda {
       Resolv.getname("127.0.0.1")
     }.should_not raise_error(Resolv::ResolvError)
+  end
+
+  it "raises ResolvError when there is no result" do
+    res = Resolv.new([])
     lambda {
-      Resolv.getname("should.raise.error")
+      res.getname("should.raise.error")
     }.should raise_error(Resolv::ResolvError)
   end
 

spec/ruby/library/resolv/get_names_spec.rb

@@ -6,10 +6,14 @@
   end
 
   it 'resolves 127.0.0.1' do
+    res = Resolv.new([Resolv::Hosts.new])
+
     names = nil
+
     lambda {
-      names = Resolv.getnames("127.0.0.1")
+      names = res.getnames("127.0.0.1")
     }.should_not raise_error(Resolv::ResolvError)
+
     names.should_not == nil
     names.size.should > 0
   end