test: remove require('buffer') from 4 test files

Remove superfluous import from: * test/parallel/test-buffer-fakes.js * test/parallel/test-buffer-includes.js * test/parallel/test-buffer-indexof.js * test/parallel/test-buffer-new.js Refs: #13836 PR-URL: #13846 Reviewed-By: Vse Mozhet Byt <[email protected]> Reviewed-By: Alexey Orlenko <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Jackson Tian <[email protected]> Reviewed-By: Refael Ackermann <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Tobias Nießen <[email protected]>

Author: leizongmin

test/parallel/test-buffer-fakes.js

@@ -2,7 +2,6 @@
 
 require('../common');
 constassert=require('assert');
-constBuffer=require('buffer').Buffer;
 
 functionFakeBuffer(){}
 Object.setPrototypeOf(FakeBuffer,Buffer);

test/parallel/test-buffer-includes.js

@@ -2,8 +2,6 @@
 constcommon=require('../common');
 constassert=require('assert');
 
-constBuffer=require('buffer').Buffer;
-
 constb=Buffer.from('abcdef');
 constbuf_a=Buffer.from('a');
 constbuf_bc=Buffer.from('bc');

test/parallel/test-buffer-indexof.js

@@ -2,8 +2,6 @@
 require('../common');
 constassert=require('assert');
 
-constBuffer=require('buffer').Buffer;
-
 constb=Buffer.from('abcdef');
 constbuf_a=Buffer.from('a');
 constbuf_bc=Buffer.from('bc');

test/parallel/test-buffer-new.js

@@ -2,6 +2,5 @@
 
 require('../common');
 constassert=require('assert');
-constBuffer=require('buffer').Buffer;
 
 assert.throws(()=>newBuffer(42,'utf8'),/firstargumentmustbeastring/);