Add resolver tests

package.json

@@ -62,7 +62,7 @@
     "all": true
   },
   "scripts": {
-    "test": "nyc gulp test",
+    "test": "nyc gulp test && GRPC_DNS_RESOLVER=ares nyc gulp nativeTestOnly",
     "coverage": "nyc report --reporter=text-lcov | coveralls"
   }
 }

packages/grpc-native-core/test/resolver_test.js

@@ -0,0 +1,69 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+'use strict';
+
+var assert = require('assert');
+var _ = require('lodash');
+
+var grpc = require('..');
+
+const insecureCreds = grpc.credentials.createInsecure();
+
+describe('Name resolver', function() {
+  let server;
+  let port;
+  before(function(done) {
+    const insecureServerCreds = grpc.ServerCredentials.createInsecure();
+    server = new grpc.Server();
+    server.bindAsync('localhost:0', insecureServerCreds, (error, portVal) => {
+      port = portVal;
+      done(error);
+    });
+  });
+  after(function() {
+    server.forceShutdown();
+  });
+  it('Should resolve a target to IPv4 addresses', function(done) {
+    const client = new grpc.Client(`loopback4.unittest.grpc.io:${port}`, insecureCreds);
+    let deadline = new Date();
+    deadline.setSeconds(deadline.getSeconds() + 1);
+    client.waitForReady(deadline, (error) => {
+      assert.ifError(error);
+      done();
+    });
+  });
+  it('Should resolve a target to IPv6 addresses', function(done) {
+    const client = new grpc.Client(`loopback6.unittest.grpc.io:${port}`, insecureCreds);
+    let deadline = new Date();
+    deadline.setSeconds(deadline.getSeconds() + 1);
+    client.waitForReady(deadline, (error) => {
+      assert.ifError(error);
+      done();
+    });
+  });
+  it('Should resolve a target to IPv4 and IPv6 addresses', function(done) {
+    const client = new grpc.Client(`loopback46.unittest.grpc.io:${port}`, insecureCreds);
+    let deadline = new Date();
+    deadline.setSeconds(deadline.getSeconds() + 1);
+    client.waitForReady(deadline, (error) => {
+      assert.ifError(error);
+      done();
+    });
+  });
+});

run-tests.bat

@@ -56,6 +56,7 @@ for %%v in (6 7 8 9 10 11 12) do (
   call .\node_modules\.bin\gulp cleanAll || SET FAILED=1
   call .\node_modules\.bin\gulp setupWindows || SET FAILED=1
   call .\node_modules\.bin\gulp test || SET FAILED=1
+  cmd.exe /c "SET GRPC_DNS_RESOLVER=ares& call .\node_modules\.bin\gulp nativeTestOnly" || SET FAILED=1
 )
 
 node merge_kokoro_logs.js