test: prepare tests for no-cond-assign ESLint rule

PR-URL: #41614
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: Trott

test/parallel/test-child-process-flush-stdio.js

@@ -27,7 +27,7 @@ const spawnWithReadable = () => {
 }));
 p.stdout.on('readable',()=>{
 letbuf;
-while(buf=p.stdout.read())
+while((buf=p.stdout.read())!==null)
 buffer.push(buf);
 });
 };

test/parallel/test-net-server-max-connections.js

@@ -68,7 +68,7 @@ function makeConnection(index) {
 if(closes===N/2){
 letcb;
 console.error('calling wait callback.');
-while(cb=waits.shift()){
+while((cb=waits.shift())!==undefined){
 cb();
 }
 server.close();

test/parallel/test-stream-readable-object-multi-push-async.js

@@ -47,7 +47,7 @@ const BATCH = 10;
 readable.on('readable',()=>{
 letdata;
 console.log('readable emitted');
-while(data=readable.read()){
+while((data=readable.read())!==null){
 console.log(data);
 }
 });

test/parallel/test-stream-unshift-empty-chunk.js

@@ -41,7 +41,7 @@ let readAll = false;
 constseen=[];
 r.on('readable',()=>{
 letchunk;
-while(chunk=r.read()){
+while((chunk=r.read())!==null){
 seen.push(chunk.toString());
 // Simulate only reading a certain amount of the data,
 // and then putting the rest of the chunk back into the

test/parallel/test-zlib-brotli-flush.js

@@ -16,7 +16,7 @@ deflater.write(chunk, function() {
 deflater.flush(function(){
 constbufs=[];
 letbuf;
-while(buf=deflater.read())
+while((buf=deflater.read())!==null)
 bufs.push(buf);
 actualFull=Buffer.concat(bufs);
 });

test/parallel/test-zlib-flush.js

@@ -23,7 +23,7 @@ deflater.write(chunk, function() {
 deflater.flush(function(){
 constbufs=[];
 letbuf;
-while(buf=deflater.read())
+while((buf=deflater.read())!==null)
 bufs.push(buf);
 actualFull=Buffer.concat(bufs);
 });

test/parallel/test-zlib-params.js

@@ -21,7 +21,7 @@ deflater.write(chunk1, function() {
 deflater.end(chunk2,function(){
 constbufs=[];
 letbuf;
-while(buf=deflater.read())
+while((buf=deflater.read())!==null)
 bufs.push(buf);
 actual=Buffer.concat(bufs);
 });