test: refactor test-net-server-bind

* Use common.mustNotCall() and common.mustCall() as appropriate
* Use block scoping
* Move assertions out of `exit` handler and into callbacks
* Order assert.strictEqual() args per docs
* Remove console.log() calls
* Move test from `parallel` to `sequential` so `common.PORT` can be used
  without conflicting with OS-provided ports in other `parallel` tests

PR-URL: nodejs#13273
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/sequential/test-net-server-bind.js

@@ -0,0 +1,64 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const net = require('net');
+
+
+// With only a callback, server should get a port assigned by the OS
+{
+  const server = net.createServer(common.mustNotCall());
+
+  server.listen(common.mustCall(function() {
+    assert.ok(server.address().port > 100);
+    server.close();
+  }));
+}
+
+// No callback to listen(), assume we can bind in 100 ms
+{
+  const server = net.createServer(common.mustNotCall());
+
+  server.listen(common.PORT);
+
+  setTimeout(function() {
+    const address = server.address();
+    assert.strictEqual(address.port, common.PORT);
+
+    if (address.family === 'IPv6')
+      assert.strictEqual(server._connectionKey, `6::::${address.port}`);
+    else
+      assert.strictEqual(server._connectionKey, `4:0.0.0.0:${address.port}`);
+
+    server.close();
+  }, 100);
+}
+
+// Callback to listen()
+{
+  const server = net.createServer(common.mustNotCall());
+
+  server.listen(common.PORT + 1, common.mustCall(function() {
+    assert.strictEqual(server.address().port, common.PORT + 1);
+    server.close();
+  }));
+}
+
+// Backlog argument
+{
+  const server = net.createServer(common.mustNotCall());
+
+  server.listen(common.PORT + 2, '0.0.0.0', 127, common.mustCall(function() {
+    assert.strictEqual(server.address().port, common.PORT + 2);
+    server.close();
+  }));
+}
+
+// Backlog argument without host argument
+{
+  const server = net.createServer(common.mustNotCall());
+
+  server.listen(common.PORT + 3, 127, common.mustCall(function() {
+    assert.strictEqual(server.address().port, common.PORT + 3);
+    server.close();
+  }));
+}