Fixed the tests

src/node/interop/interop_client.js

@@ -49,8 +49,8 @@ var AUTH_USER = ('155450119199-3psnrh1sdr3d8cpj1v46naggf81mhdnk' +
 var COMPUTE_ENGINE_USER = ('155450119199-r5aaqa2vqoa9g5mv2m6s3m1l293rlmel' +
     '@developer.gserviceaccount.com');
 
-var ECHO_INITIAL_KEY = "x-grpc-test-echo-initial";
+var ECHO_INITIAL_KEY = 'x-grpc-test-echo-initial';
-var ECHO_TRAILING_KEY = "x-grpc-test-echo-trailing-bin";
+var ECHO_TRAILING_KEY = 'x-grpc-test-echo-trailing-bin';
 
 /**
  * Create a buffer filled with size zeroes
@@ -324,7 +324,7 @@ function customMetadata(client, done) {
   unary.on('status', function(status) {
     var echo_trailer = status.metadata.get(ECHO_TRAILING_KEY);
     assert(echo_trailer.length > 0);
-    assert.strictEqual(echo_trailer.toString('hex'), 'ababab');
+    assert.strictEqual(echo_trailer[0].toString('hex'), 'ababab');
     done();
   });
   var stream = client.fullDuplexCall(metadata);
@@ -336,7 +336,7 @@ function customMetadata(client, done) {
   stream.on('status', function(status) {
     var echo_trailer = status.metadata.get(ECHO_TRAILING_KEY);
     assert(echo_trailer.length > 0);
-    assert.strictEqual(echo_trailer.toString('hex'), 'ababab');
+    assert.strictEqual(echo_trailer[0].toString('hex'), 'ababab');
     done();
   });
   stream.write(streaming_arg);

src/node/interop/interop_server.js

@@ -39,8 +39,8 @@ var _ = require('lodash');
 var grpc = require('..');
 var testProto = grpc.load(__dirname + '/test.proto').grpc.testing;
 
-var ECHO_INITIAL_KEY = "x-grpc-test-echo-initial";
+var ECHO_INITIAL_KEY = 'x-grpc-test-echo-initial';
-var ECHO_TRAILING_KEY = "x-grpc-test-echo-trailing-bin";
+var ECHO_TRAILING_KEY = 'x-grpc-test-echo-trailing-bin';
 
 /**
  * Create a buffer filled with size zeroes

src/node/test/interop_sanity_test.js

@@ -90,7 +90,7 @@ describe('Interop tests', function() {
     interop_client.runTest(port, name_override, 'timeout_on_sleeping_server',
                            true, true, done);
   });
-  it.only('should pass custom_metadata', function(done) {
+  it('should pass custom_metadata', function(done) {
     interop_client.runTest(port, name_override, 'custom_metadata',
                            true, true, done);
   });