test: use os.devNull (#1090)

Author: lpinca

test/bin/test-citgm-all.js

@@ -1,4 +1,5 @@
 import { fileURLToPath } from 'url';
+import { devNull as nullDevice } from 'os';
 
 import tap from 'tap';
 
@@ -11,7 +12,6 @@ const citgmAllPath = fileURLToPath(
 const { test } = tap;
 
 const isWin32 = process.platform === 'win32';
-const nullDevice = isWin32 ? '\\\\.\\NUL' : '/dev/null';
 
 test('citgm-all: /w markdown /w -j', (t) => {
   t.plan(1);

test/bin/test-citgm.js

@@ -1,4 +1,5 @@
 import { fileURLToPath } from 'url';
+import { devNull as nullDevice } from 'os';
 
 import tap from 'tap';
 
@@ -9,7 +10,6 @@ const citgmPath = fileURLToPath(new URL('../../bin/citgm.js', import.meta.url));
 const { test } = tap;
 
 const isWin32 = process.platform === 'win32';
-const nullDevice = isWin32 ? '\\\\.\\NUL' : '/dev/null';
 
 test('bin: omg-i-pass /w tap to file /w junit to file /w append', (t) => {
   t.plan(1);

test/test-temp-directory.js

@@ -1,14 +1,12 @@
 import { promises as fs } from 'fs';
+import { devNull as nullDevice } from 'os';
 
 import tap from 'tap';
 
 import * as tempDirectory from '../lib/temp-directory.js';
 
 const { test } = tap;
 
-const isWin32 = process.platform === 'win32';
-const nullDevice = isWin32 ? '\\\\.\\NUL' : '/dev/null';
-
 const context = {
   path: null,
   emit: function () {},