Wrap tests for unixserver in an outer guard block

Normalize to `with_feature :unix_socket`, which is more descriptive and
generic than checking for windows.

Author: herwinw

library/socket/unixserver/accept_nonblock_spec.rb

@@ -1,9 +1,8 @@
 require_relative '../spec_helper'
 require_relative '../fixtures/classes'
 
-describe "UNIXServer#accept_nonblock" do
-
-  platform_is_not :windows do
+with_feature :unix_socket do
+  describe "UNIXServer#accept_nonblock" do
     before :each do
       @path = SocketSpecs.socket_path
       @server = UNIXServer.open(@path)
@@ -33,9 +32,7 @@
       @server.accept_nonblock(exception: false).should == :wait_readable
     end
   end
-end
 
-with_feature :unix_socket do
   describe 'UNIXServer#accept_nonblock' do
     before do
       @path   = SocketSpecs.socket_path

library/socket/unixserver/accept_spec.rb

@@ -1,7 +1,7 @@
 require_relative '../spec_helper'
 require_relative '../fixtures/classes'
 
-platform_is_not :windows do
+with_feature :unix_socket do
   describe "UNIXServer#accept" do
     before :each do
       @path = SocketSpecs.socket_path

library/socket/unixserver/for_fd_spec.rb

@@ -1,7 +1,7 @@
 require_relative '../spec_helper'
 require_relative '../fixtures/classes'
 
-platform_is_not :windows do
+with_feature :unix_socket do
   describe "UNIXServer#for_fd" do
     before :each do
       @unix_path = SocketSpecs.socket_path

library/socket/unixserver/new_spec.rb

@@ -1,6 +1,8 @@
 require_relative '../spec_helper'
 require_relative 'shared/new'
 
-describe "UNIXServer.new" do
-  it_behaves_like :unixserver_new, :new
+with_feature :unix_socket do
+  describe "UNIXServer.new" do
+    it_behaves_like :unixserver_new, :new
+  end
 end

library/socket/unixserver/open_spec.rb

@@ -2,10 +2,10 @@
 require_relative '../fixtures/classes'
 require_relative 'shared/new'
 
-describe "UNIXServer.open" do
-  it_behaves_like :unixserver_new, :open
+with_feature :unix_socket do
+  describe "UNIXServer.open" do
+    it_behaves_like :unixserver_new, :open
 
-  platform_is_not :windows do
     before :each do
       @path = SocketSpecs.socket_path
     end

library/socket/unixserver/shared/new.rb

@@ -2,21 +2,19 @@
 require_relative '../../fixtures/classes'
 
 describe :unixserver_new, shared: true do
-  platform_is_not :windows do
-    before :each do
-      @path = SocketSpecs.socket_path
-    end
+  before :each do
+    @path = SocketSpecs.socket_path
+  end
 
-    after :each do
-      @server.close if @server
-      @server = nil
-      SocketSpecs.rm_socket @path
-    end
+  after :each do
+    @server.close if @server
+    @server = nil
+    SocketSpecs.rm_socket @path
+  end
 
-    it "creates a new UNIXServer" do
-      @server = UNIXServer.send(@method, @path)
-      @server.path.should == @path
-      @server.addr.should == ["AF_UNIX", @path]
-    end
+  it "creates a new UNIXServer" do
+    @server = UNIXServer.send(@method, @path)
+    @server.path.should == @path
+    @server.addr.should == ["AF_UNIX", @path]
   end
 end