test: remove unnecessary .toString() calls in HTTP tests

Let’s not have bad examples in our test suite and instead use the
proper way of converting stream data to UTF-8
(i.e. `stream.setEncoding('utf8')`) in all places.

PR-URL: #43731
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: addaleax

test/parallel/test-http-missing-header-separator-cr.js

@@ -26,7 +26,7 @@ server.listen(0, common.mustSucceed(() => {
   let response = '';
 
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   client.setEncoding('utf8');

test/parallel/test-http-server-close-all.js

@@ -31,8 +31,10 @@ server.listen(0, function() {
     const client2 = connect(port);
     let response = '';
 
+    client2.setEncoding('utf8');
+
     client2.on('data', common.mustCall((chunk) => {
-      response += chunk.toString('utf-8');
+      response += chunk;
 
       if (response.endsWith('0\r\n\r\n')) {
         assert(response.startsWith('HTTP/1.1 200 OK\r\nConnection: keep-alive'));

test/parallel/test-http-server-close-idle.js

@@ -33,8 +33,10 @@ server.listen(0, function() {
     const client2 = connect(port);
     let response = '';
 
+    client2.setEncoding('utf8');
+
     client2.on('data', common.mustCall((chunk) => {
-      response += chunk.toString('utf-8');
+      response += chunk;
 
       if (response.endsWith('0\r\n\r\n')) {
         assert(response.startsWith('HTTP/1.1 200 OK\r\nConnection: keep-alive'));

test/parallel/test-http-server-headers-timeout-delayed-headers.js

@@ -33,8 +33,9 @@ server.listen(0, common.mustCall(() => {
   const client = connect(server.address().port);
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   const errOrEnd = common.mustSucceed(function(err) {

test/parallel/test-http-server-headers-timeout-interrupted-headers.js

@@ -33,8 +33,9 @@ server.listen(0, common.mustCall(() => {
   const client = connect(server.address().port);
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   const errOrEnd = common.mustSucceed(function(err) {

test/parallel/test-http-server-headers-timeout-keepalive.js

@@ -47,8 +47,9 @@ server.listen(0, common.mustCall(() => {
   let second = false;
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCallAtLeast((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
 
     // First response has ended
     if (!second && response.endsWith('\r\n\r\n')) {

test/parallel/test-http-server-headers-timeout-pipelining.js

@@ -33,8 +33,9 @@ server.listen(0, common.mustCall(() => {
   let second = false;
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCallAtLeast((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
 
     // First response has ended
     if (!second && response.endsWith('\r\n\r\n')) {

test/parallel/test-http-server-request-timeout-delayed-body.js

@@ -40,8 +40,9 @@ server.listen(0, common.mustCall(() => {
   const client = connect(server.address().port);
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   client.resume();

test/parallel/test-http-server-request-timeout-delayed-headers.js

@@ -28,8 +28,9 @@ server.listen(0, common.mustCall(() => {
   const client = connect(server.address().port);
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   const errOrEnd = common.mustSucceed(function(err) {

test/parallel/test-http-server-request-timeout-interrupted-body.js

@@ -40,8 +40,9 @@ server.listen(0, common.mustCall(() => {
   const client = connect(server.address().port);
   let response = '';
 
+  client.setEncoding('utf8');
   client.on('data', common.mustCall((chunk) => {
-    response += chunk.toString('utf-8');
+    response += chunk;
   }));
 
   const errOrEnd = common.mustSucceed(function(err) {