test: begin normalizing fixtures use

Adds a new `../common/fixtures' module to begin normalizing
`test/fixtures` use. Our test code is a bit inconsistent with
regards to use of the fixtures directory. Some code uses
`path.join()`, some code uses string concats, some other
code uses template strings, etc. In mnay cases, significant
duplication of code is seen when accessing fixture files, etc.

This updates many (but by no means all) of the tests in the
test suite to use the new consistent API. There are still
many more to update, which would make an excelent Code-n-Learn
exercise.

PR-URL: https://github.com/nodejs/node/pull/14332
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/test/parallel/test-tls-zero-clear-in.js b/test/parallel/test-tls-zero-clear-in.js
index 84c03d292c..006e756826 100644
--- a/test/parallel/test-tls-zero-clear-in.js
+++ b/test/parallel/test-tls-zero-clear-in.js
@@ -26,12 +26,10 @@ if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const tls = require('tls');
+const fixtures = require('../common/fixtures');
 
-const fs = require('fs');
-const path = require('path');
-
-const cert = fs.readFileSync(path.join(common.fixturesDir, 'test_cert.pem'));
-const key = fs.readFileSync(path.join(common.fixturesDir, 'test_key.pem'));
+const cert = fixtures.readSync('test_cert.pem');
+const key = fixtures.readSync('test_key.pem');
 
 const server = tls.createServer({
   cert: cert,