test: use fixtures module instead of common

PR-URL: #15925
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: wonk

test/parallel/test-https-simple.js

@@ -1,16 +1,16 @@
 'use strict';
 const common = require('../common');
+const fixtures = require('../common/fixtures');
 
 if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const assert = require('assert');
 const https = require('https');
-const fs = require('fs');
 
 const options = {
-  key: fs.readFileSync(`${common.fixturesDir}/keys/agent1-key.pem`),
-  cert: fs.readFileSync(`${common.fixturesDir}/keys/agent1-cert.pem`)
+  key: fixtures.readKey('agent1-key.pem'),
+  cert: fixtures.readKey('agent1-cert.pem')
 };
 
 const tests = 2;