net: make readyState to be closed if socket is not opened

Fixes: nodejs#38247

doc/api/net.md

@@ -1115,6 +1115,10 @@ information.
 ### `socket.readyState`
 <!-- YAML
 added: v0.5.0
+changes:
+  - version: REPLACEME
+    pr-url: REPLACEME
+    description: When stream is not opened, reading it will be `closed`.
 -->
 
 * {string}
@@ -1125,6 +1129,8 @@ This property represents the state of the connection as a string.
 * If the stream is readable and writable, it is `open`.
 * If the stream is readable and not writable, it is `readOnly`.
 * If the stream is not readable and writable, it is `writeOnly`.
+* If the stream is not opened or is neither readable nor writable, it is
+  `closed`.
 
 ## `net.connect()`
 

lib/net.js

@@ -536,6 +536,8 @@ ObjectDefineProperty(Socket.prototype, 'readyState', {
   get: function() {
     if (this.connecting) {
       return 'opening';
+    } else if(this.pending) {
+      return "closed";
     } else if (this.readable && this.writable) {
       return 'open';
     } else if (this.readable && !this.writable) {

test/parallel/test-net-connect-buffer.js

@@ -45,6 +45,7 @@ tcp.listen(0, common.mustCall(function() {
 
   let connected = false;
   assert.strictEqual(socket.pending, true);
+  assert.strictEqual(socket.readyState, 'closed');
   socket.connect(this.address().port, common.mustCall(() => connected = true));
 
   assert.strictEqual(socket.pending, true);