Update specs to run with IPv6 support disabled (#15046)

spec/std/http/server/server_spec.cr

@@ -18,7 +18,7 @@ private def unix_request(path)
 end
 
 private def unused_port
-  TCPServer.open(0) do |server|
+  TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |server|
     server.local_address.port
   end
 end

spec/std/openssl/ssl/server_spec.cr

@@ -11,7 +11,7 @@ require "../../../support/ssl"
 
 describe OpenSSL::SSL::Server do
   it "sync_close" do
-    TCPServer.open(0) do |tcp_server|
+    TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |tcp_server|
       context = OpenSSL::SSL::Context::Server.new
       ssl_server = OpenSSL::SSL::Server.new(tcp_server, context)
 
@@ -22,7 +22,7 @@ describe OpenSSL::SSL::Server do
   end
 
   it "don't sync_close" do
-    TCPServer.open(0) do |tcp_server|
+    TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |tcp_server|
       context = OpenSSL::SSL::Context::Server.new
       ssl_server = OpenSSL::SSL::Server.new(tcp_server, context, sync_close: false)
       ssl_server.context.should eq context
@@ -35,7 +35,7 @@ describe OpenSSL::SSL::Server do
 
   it ".new" do
     context = OpenSSL::SSL::Context::Server.new
-    TCPServer.open(0) do |tcp_server|
+    TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |tcp_server|
       ssl_server = OpenSSL::SSL::Server.new tcp_server, context, sync_close: false
 
       ssl_server.context.should eq context
@@ -46,7 +46,7 @@ describe OpenSSL::SSL::Server do
 
   it ".open" do
     context = OpenSSL::SSL::Context::Server.new
-    TCPServer.open(0) do |tcp_server|
+    TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |tcp_server|
       ssl_server = nil
       OpenSSL::SSL::Server.open tcp_server, context do |server|
         server.wrapped.should eq tcp_server

spec/std/socket/spec_helper.cr

@@ -5,7 +5,7 @@ module SocketSpecHelper
   class_getter?(supports_ipv6 : Bool) do
     TCPServer.open("::1", 0) { return true }
     false
-  rescue Socket::BindError
+  rescue Socket::Error
     false
   end
 end
@@ -33,7 +33,7 @@ def each_ip_family(&block : Socket::Family, String, String ->)
 end
 
 def unused_local_port
-  TCPServer.open("::", 0) do |server|
+  TCPServer.open(Socket::IPAddress::UNSPECIFIED, 0) do |server|
     server.local_address.port
   end
 end

spec/std/socket/tcp_server_spec.cr

@@ -120,7 +120,7 @@ describe TCPServer, tags: "network" do
 
     it "binds to all interfaces" do
       port = unused_local_port
-      TCPServer.open(port) do |server|
+      TCPServer.open(Socket::IPAddress::UNSPECIFIED, port) do |server|
         server.local_address.port.should eq port
       end
     end

spec/std/socket/tcp_socket_spec.cr

@@ -112,6 +112,8 @@ describe TCPSocket, tags: "network" do
     end
 
     it "fails to connect IPv6 to IPv4 server" do
+      pending! "IPv6 is unavailable" unless SocketSpecHelper.supports_ipv6?
+
       port = unused_local_port
 
       TCPServer.open("0.0.0.0", port) do |server|
@@ -133,7 +135,7 @@ describe TCPSocket, tags: "network" do
     it "sync from server" do
       port = unused_local_port
 
-      TCPServer.open("::", port) do |server|
+      TCPServer.open(Socket::IPAddress::UNSPECIFIED, port) do |server|
         TCPSocket.open("localhost", port) do |client|
           sock = server.accept
           sock.sync?.should eq(server.sync?)
@@ -152,7 +154,7 @@ describe TCPSocket, tags: "network" do
     it "settings" do
       port = unused_local_port
 
-      TCPServer.open("::", port) do |server|
+      TCPServer.open(Socket::IPAddress::UNSPECIFIED, port) do |server|
         TCPSocket.open("localhost", port) do |client|
           # test protocol specific socket options
           (client.tcp_nodelay = true).should be_true
@@ -202,7 +204,7 @@ describe TCPSocket, tags: "network" do
 
       channel = Channel(Exception?).new
       spawn do
-        TCPServer.open("::", port) do |server|
+        TCPServer.open(Socket::IPAddress::UNSPECIFIED, port) do |server|
           channel.send nil
           sock = server.accept
           sock.read_timeout = 3.second