Getting grpc set up for tests

test/grpc-mock.ts

@@ -0,0 +1,56 @@
+import {describe, it} from 'mocha';
+import {Bigtable} from '../src';
+import * as v2 from '../src/v2';
+import {PassThrough} from 'stream';
+
+import * as protos from '../protos/protos';
+import jsonProtos = require('../protos/protos.json');
+
+import grpc = require('@grpc/grpc-js');
+import protoLoader = require('@grpc/proto-loader');
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
+const packageDefinition = protoLoader.fromJSON(jsonProtos, {
+  keepCase: true,
+  longs: String,
+  enums: String,
+  defaults: true,
+  oneofs: true,
+});
+const readRows = (arg1: any, arg2: any) => {
+  console.log(arg1, arg2);
+};
+const proto = grpc.loadPackageDefinition(packageDefinition);
+const server = new grpc.Server();
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
+const service = proto.google.bigtable.v2.Bigtable.service;
+server.addService(service, {
+  ReadRows: readRows,
+});
+server.bindAsync(
+  'localhost:1234',
+  grpc.ServerCredentials.createInsecure(),
+  () => {
+    server.start();
+  }
+);
+
+describe('Bigtable/Grpc-mock', () => {
+  it('error should not change when emitted from gax', done => {
+    const bigtable = new Bigtable({apiEndpoint: 'localhost:1234'});
+    const clientConfig = 'BigtableClient';
+    const gaxClient = new v2[clientConfig]({});
+    const stream = new PassThrough({objectMode: true});
+    gaxClient.innerApiCalls.readRows = () => {
+      return stream;
+    };
+    const table = bigtable.instance('fake-instance').table('fake-table');
+    const readStream = table.createReadStream({});
+    readStream.on('error', err => {
+      console.log(err);
+      done();
+    });
+    console.log('test');
+  });
+});