test: handle EUNATCH

When IPv6 is disabled IBM i returns EUNATCH (errno 42)
instead of EADDRNOTAVAIL.

libuv 1.46.0 adds EUNATCH errno

We can now use error.code to refer to EUNATCH
in node versions that use libuv 1.46.0.

PR-URL: #48050
Refs: #48049
Refs: #46546
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-net-autoselectfamily-commandline-option.js

@@ -87,6 +87,8 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
           assert.strictEqual(error.message, `connect ECONNREFUSED ::1:${port}`);
         } else if (error.code === 'EAFNOSUPPORT') {
           assert.strictEqual(error.message, `connect EAFNOSUPPORT ::1:${port} - Local (undefined:undefined)`);
+        } else if (error.code === 'EUNATCH') {
+          assert.strictEqual(error.message, `connect EUNATCH ::1:${port} - Local (:::0)`);
         } else {
           assert.strictEqual(error.code, 'EADDRNOTAVAIL');
           assert.strictEqual(error.message, `connect EADDRNOTAVAIL ::1:${port} - Local (:::0)`);

test/parallel/test-net-autoselectfamily-default.js

@@ -125,10 +125,8 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
           assert.strictEqual(error.message, `connect ECONNREFUSED ::1:${port}`);
         } else if (error.code === 'EAFNOSUPPORT') {
           assert.strictEqual(error.message, `connect EAFNOSUPPORT ::1:${port} - Local (undefined:undefined)`);
-        } else if (common.isIBMi) {
-          // IBMi returns EUNATCH (ERRNO 42) when IPv6 is disabled
-          // keep this errno assertion until EUNATCH is recognized by libuv
-          assert.strictEqual(error.errno, -42);
+        } else if (error.code === 'EUNATCH') {
+          assert.strictEqual(error.message, `connect EUNATCH ::1:${port} - Local (:::0)`);
         } else {
           assert.strictEqual(error.code, 'EADDRNOTAVAIL');
           assert.strictEqual(error.message, `connect EADDRNOTAVAIL ::1:${port} - Local (:::0)`);

test/parallel/test-net-autoselectfamily.js

@@ -282,10 +282,8 @@ if (common.hasIPv6) {
           assert.strictEqual(error.message, `connect ECONNREFUSED ::1:${port}`);
         } else if (error.code === 'EAFNOSUPPORT') {
           assert.strictEqual(error.message, `connect EAFNOSUPPORT ::1:${port} - Local (undefined:undefined)`);
-        } else if (common.isIBMi) {
-          // IBMi returns EUNATCH (ERRNO 42) when IPv6 is disabled
-          // keep this errno assertion until EUNATCH is recognized by libuv
-          assert.strictEqual(error.errno, -42);
+        } else if (error.code === 'EUNATCH') {
+          assert.strictEqual(error.message, `connect EUNATCH ::1:${port} - Local (:::0)`);
         } else {
           assert.strictEqual(error.code, 'EADDRNOTAVAIL');
           assert.strictEqual(error.message, `connect EADDRNOTAVAIL ::1:${port} - Local (:::0)`);