Fix failures when all network interfaces are down

spec/ruby/library/socket/tcpsocket/shared/new.rb

@@ -19,6 +19,9 @@ describe :tcpsocket_new, shared: true do
       -> {
         TCPSocket.send(@method, "192.0.2.1", 80, connect_timeout: 0)
       }.should raise_error(Errno::ETIMEDOUT)
+    rescue Errno::ENETUNREACH
+      # In the case all network interfaces down.
+      # raise_error cannot deal with multiple expected exceptions
     end
   end
 
@@ -27,6 +30,9 @@ describe :tcpsocket_new, shared: true do
       -> {
         TCPSocket.send(@method, "192.0.2.1", 80, connect_timeout: 0)
       }.should raise_error(IO::TimeoutError)
+    rescue Errno::ENETUNREACH
+      # In the case all network interfaces down.
+      # raise_error cannot deal with multiple expected exceptions
     end
   end
 

test/socket/test_tcp.rb

@@ -70,7 +70,7 @@ class TestSocket_TCPSocket < Test::Unit::TestCase
   end
 
   def test_initialize_connect_timeout
-    assert_raise(IO::TimeoutError) do
+    assert_raise(IO::TimeoutError, Errno::ENETUNREACH) do
       TCPSocket.new("192.0.2.1", 80, connect_timeout: 0)
     end
   end