test: refactor test-fs-write-file

Replaced all error checks with assert.ifError(e).
PR-URL: #10030
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: radelmann

test/parallel/test-fs-write-file.js

@@ -18,10 +18,10 @@ const s = '南越国是前203年至前111年存在于岭南地区的一个国家
 '它的建立保证了秦末乱世岭南地区社会秩序的稳定，有效的改善了岭南地区落后的政治、##济现状。\n';
 
 fs.writeFile(filename,s,common.mustCall(function(e){
-if(e)throwe;
+assert.ifError(e);
 
 fs.readFile(filename,common.mustCall(function(e,buffer){
-if(e)throwe;
+assert.ifError(e);
 assert.strictEqual(Buffer.byteLength(s),buffer.length);
 }));
 }));
@@ -31,10 +31,10 @@ const filename2 = join(common.tmpDir, 'test2.txt');
 constbuf=Buffer.from(s,'utf8');
 
 fs.writeFile(filename2,buf,common.mustCall(function(e){
-if(e)throwe;
+assert.ifError(e);
 
 fs.readFile(filename2,common.mustCall(function(e,buffer){
-if(e)throwe;
+assert.ifError(e);
 
 assert.strictEqual(buf.length,buffer.length);
 }));
@@ -45,7 +45,7 @@ const filename3 = join(common.tmpDir, 'test3.txt');
 
 constm=0o600;
 fs.writeFile(filename3,n,{mode: m},common.mustCall(function(e){
-if(e)throwe;
+assert.ifError(e);
 
 // windows permissions aren't unix
 if(!common.isWindows){
@@ -54,7 +54,7 @@ fs.writeFile(filename3, n, { mode: m }, common.mustCall(function(e) {
 }
 
 fs.readFile(filename3,common.mustCall(function(e,buffer){
-if(e)throwe;
+assert.ifError(e);
 
 assert.strictEqual(Buffer.byteLength(''+n),buffer.length);
 }));
@@ -64,16 +64,16 @@ fs.writeFile(filename3, n, { mode: m }, common.mustCall(function(e) {
 constfilename4=join(common.tmpDir,'test4.txt');
 
 fs.open(filename4,'w+',common.mustCall(function(e,fd){
-if(e)throwe;
+assert.ifError(e);
 
 fs.writeFile(fd,s,common.mustCall(function(e){
-if(e)throwe;
+assert.ifError(e);
 
 fs.close(fd,common.mustCall(function(e){
-if(e)throwe;
+assert.ifError(e);
 
 fs.readFile(filename4,common.mustCall(function(e,buffer){
-if(e)throwe;
+assert.ifError(e);
 
 assert.strictEqual(Buffer.byteLength(s),buffer.length);
 }));