test: add tests for options.fs in fs streams

PR-URL: #33185
Reviewed-By: Adrian Estrada <edsadr@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

Author: julianduque

test/parallel/test-fs-stream-fs-options.js

@@ -0,0 +1,73 @@
+'use strict';
+
+require('../common');
+constfixtures=require('../common/fixtures');
+constpath=require('path');
+constfs=require('fs');
+constassert=require('assert');
+
+consttmpdir=require('../common/tmpdir');
+tmpdir.refresh();
+
+conststreamOpts=['open','close'];
+constwriteStreamOptions=[...streamOpts,'write'];
+constreadStreamOptions=[...streamOpts,'read'];
+constoriginalFs={ fs };
+
+{
+constfile=path.join(tmpdir.path,'write-end-test0.txt');
+
+writeStreamOptions.forEach((fn)=>{
+constoverrideFs=Object.assign({},originalFs.fs,{[fn]: null});
+if(fn==='write')overrideFs.writev=null;
+
+constopts={
+fs: overrideFs
+};
+assert.throws(
+()=>fs.createWriteStream(file,opts),{
+code: 'ERR_INVALID_ARG_TYPE',
+name: 'TypeError',
+message: `The "options.fs.${fn}" property must be of type function. `+
+'Received null'
+},
+`createWriteStream options.fs.${fn} should throw if isn't a function`
+);
+});
+}
+
+{
+constfile=path.join(tmpdir.path,'write-end-test0.txt');
+constoverrideFs=Object.assign({},originalFs.fs,{writev: 'not a fn'});
+constopts={
+fs: overrideFs
+};
+assert.throws(
+()=>fs.createWriteStream(file,opts),{
+code: 'ERR_INVALID_ARG_TYPE',
+name: 'TypeError',
+message: 'The "options.fs.writev" property must be of type function. '+
+'Received type string (\'not a fn\')'
+},
+'createWriteStream options.fs.writev should throw if isn\'t a function'
+);
+}
+
+{
+constfile=fixtures.path('x.txt');
+readStreamOptions.forEach((fn)=>{
+constoverrideFs=Object.assign({},originalFs.fs,{[fn]: null});
+constopts={
+fs: overrideFs
+};
+assert.throws(
+()=>fs.createReadStream(file,opts),{
+code: 'ERR_INVALID_ARG_TYPE',
+name: 'TypeError',
+message: `The "options.fs.${fn}" property must be of type function. `+
+'Received null'
+},
+`createReadStream options.fs.${fn} should throw if isn't a function`
+);
+});
+}