refactor(auth): convert ava tests to mocha (GoogleCloudPlatform#1146)

Author: nareshqlogic

auth/package.json

@@ -12,15 +12,16 @@
  "node": ">=8"
  },
  "scripts": {
- "test": "repo-tools test run --cmd ava -- -T 20s --verbose system-test/*.test.js"
+ "test": "repo-tools test install --cmd=npm -- run system-test",
+ "system-test": "mocha system-test/*.test.js --timeout=30000"
  },
  "dependencies": {
  "@google-cloud/storage": "^2.0.3",
  "yargs": "12.0.5"
  },
  "devDependencies": {
  "@google-cloud/nodejs-repo-tools": "^3.0.0",
- "ava": "0.25.0"
+ "mocha": "^5.2.0"
  },
  "cloud-repo-tools": {
  "requiresKeyFile": true,

auth/system-test/auth.test.js

@@ -15,21 +15,21 @@
 
 'use strict';
 
-const path = require(`path`);
-const test = require(`ava`);
-const tools = require(`@google-cloud/nodejs-repo-tools`);
+const path = require('path');
+const assert = require('assert');
+const tools = require('@google-cloud/nodejs-repo-tools');
 
-const cwd = path.join(__dirname, `..`);
-const cmd = `node auth.js`;
+const cwd = path.join(__dirname, '..');
+const cmd = 'node auth.js';
 
-test.before(tools.checkCredentials);
+before(tools.checkCredentials);
 
-test.serial(`should load credentials implicitly`, async t => {
+it('should load credentials implicitly', async () => {
  const output = await tools.runAsync(`${cmd} auth-cloud-implicit`, cwd);
- t.is(output.includes(`Buckets:`), true);
+ assert.strictEqual(output.includes('Buckets:'), true);
 });
 
-test.serial(`should load credentials explicitly`, async t => {
+it('should load credentials explicitly', async () => {
  const output = await tools.runAsync(`${cmd} auth-cloud-explicit`, cwd);
- t.is(output.includes(`Buckets:`), true);
+ assert.strictEqual(output.includes('Buckets:'), true);
 });