refactor: use explicit mocha imports (#343)

Author: JustinBeckwith

monitoring/snippets/test/.eslintrc.yml

@@ -16,6 +16,7 @@
 
 const monitoring = require('@google-cloud/monitoring');
 const {assert} = require('chai');
+const {describe, it, before, after} = require('mocha');
 const cp = require('child_process');
 const uuid = require('uuid');
 const path = require('path');

monitoring/snippets/test/alerts.test.js

@@ -16,6 +16,7 @@
 
 const monitoring = require('@google-cloud/monitoring');
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 const retry = require('p-retry');
 

monitoring/snippets/test/metrics.test.js

@@ -15,6 +15,7 @@
 'use strict';
 
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 const retry = require('p-retry');
 

monitoring/snippets/test/quickstart.test.js

@@ -15,6 +15,7 @@
 'use strict';
 
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 
 const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});