test: deflake test-http2-misbehaving-multiplex

Fixes: #54859

Author: lpinca

test/parallel/test-http2-misbehaving-multiplex.js

@@ -15,14 +15,25 @@ const h2test = require('../common/http2');
 const server = h2.createServer();
 server.on('stream', common.mustCall((stream) => {
   stream.respond();
-  stream.end('ok');
 
-  stream.on('error', common.expectsError({
-    code: 'ERR_HTTP2_ERROR',
-    constructor: NghttpError,
-    message: 'Stream was already closed or invalid'
-  }));
-  stream.on('close', common.mustCall());
+  if (stream.id === 3) {
+    stream.on('close', () => {
+      // A second Stream ID 1 frame should fail.
+      // This will cause an error to occur because the client is
+      // attempting to reuse an already closed stream. This must
+      // cause the server session to be torn down.
+      client.write(id1.data);
+      // This Stream ID 5 frame will never make it to the server.
+      client.write(id5.data);
+    });
+    stream.end('ok');
+  } else {
+    stream.on('error', common.expectsError({
+      code: 'ERR_HTTP2_ERROR',
+      constructor: NghttpError,
+      message: 'Stream was already closed or invalid'
+    }));
+  }
 
   // Stream ID 5 should never reach the server
   assert.notStrictEqual(stream.id, 5);
@@ -52,16 +63,7 @@ server.listen(0, () => {
         // Stream ID 1 frame will make it OK.
         client.write(id1.data, () => {
           // Stream ID 3 frame will make it OK.
-          client.write(id3.data, () => {
-            // A second Stream ID 1 frame should fail.
-            // This will cause an error to occur because the client is
-            // attempting to reuse an already closed stream. This must
-            // cause the server session to be torn down.
-            client.write(id1.data, () => {
-              // This Stream ID 5 frame will never make it to the server
-              client.write(id5.data);
-            });
-          });
+          client.write(id3.data);
         });
       });
     });