On macOS High Sierra 10.13.6 in 32-bit and 64-bit:
If NetNameResolver useOldNetwork == false then only 1 SocketTest test passes, 2 fail and 11 raise errors. The plugin reports connect errors, one for each error:
sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family sqConnectToAddressSize: Address family not supported by protocol family
If NetNameResolver useOldNetwork == true then only one test passes and there are 13 failures. Many (all?) fail with waitForConnectionFor:ifTimedOut:ifRefused: timing out.