refactor: use explicit mocha imports (#496)

speech/system-test/.eslintrc.yml

@@ -1,6 +1,4 @@
 ---
-env:
-  mocha: true
 rules:
   node/no-unpublished-require: off
   node/no-unsupported-features: off

speech/system-test/MicrophoneStream.test.js

@@ -16,6 +16,7 @@
 
 const path = require('path');
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 
 const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});

speech/system-test/betaFeatures.test.js

@@ -16,6 +16,7 @@
 
 const path = require('path');
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 
 const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});

speech/system-test/quickstart.test.js

@@ -18,6 +18,7 @@
 
 const path = require('path');
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 
 const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});

speech/system-test/recognize.test.js

@@ -17,6 +17,7 @@
 const path = require('path');
 const {Storage} = require('@google-cloud/storage');
 const {assert} = require('chai');
+const {describe, it, before, after} = require('mocha');
 const uuid = require('uuid');
 const cp = require('child_process');
 

speech/system-test/recognize.v1p1beta1.test.js

@@ -16,6 +16,7 @@
 
 const path = require('path');
 const {assert} = require('chai');
+const {describe, it} = require('mocha');
 const cp = require('child_process');
 
 const execSync = cmd => cp.execSync(cmd, {encoding: 'utf-8'});