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diff --git a/test/lisp/erc/erc-scenarios-base-netid-samenet.el b/test/lisp/erc/erc-scenarios-base-netid-samenet.el
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+;;; erc-scenarios-base-network-id-samenet.el --- netid-id samenet scenarios -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 Free Software Foundation, Inc.
+;;
+;; This file is part of GNU Emacs.
+;;
+;; This program is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see
+;; <https://www.gnu.org/licenses/>.
+
+(require 'ert-x)
+(eval-and-compile
+  (let ((load-path (cons (ert-resource-directory) load-path)))
+    (require 'erc-scenarios-common)))
+
+(eval-when-compile (require 'erc-join))
+
+(cl-defun erc-scenarios-common--base-network-id-same-network
+    ((&key nick id server chan
+           &aux (nick-a nick) (id-a id) (serv-buf-a server) (chan-buf-a chan))
+     (&key nick id server chan
+           &aux (nick-b nick) (id-b id) (serv-buf-b server) (chan-buf-b chan)))
+  (erc-scenarios-common-with-cleanup
+      ((erc-scenarios-common-dialog "base/netid/samenet")
+       (dumb-server (erc-d-run "localhost" t 'tester 'chester))
+       (port (process-contact dumb-server :service))
+       (expect (erc-d-t-make-expecter))
+       (erc-server-flood-penalty 0.1)
+       (erc-server-flood-margin 30)
+       erc-serv-buf-a erc-serv-buf-b)
+
+    (ert-info ("Connect to foonet with nick tester")
+      (with-current-buffer
+          (setq erc-serv-buf-a (erc :server "127.0.0.1"
+                                    :port port
+                                    :nick nick-a
+                                    :password "changeme"
+                                    :full-name nick-a
+                                    :id id-a))
+        (erc-scenarios-common-assert-initial-buf-name id-a port)
+        (erc-d-t-wait-for 5 (eq erc-network 'foonet))))
+
+    (ert-info ("Connect to foonet with nick chester")
+      (with-current-buffer
+          (setq erc-serv-buf-b (erc :server "127.0.0.1"
+                                    :port port
+                                    :nick nick-b
+                                    :password "changeme"
+                                    :full-name nick-b
+                                    :id id-b))
+        (erc-scenarios-common-assert-initial-buf-name id-b port)))
+
+    (erc-d-t-wait-for 3 (not (erc-scenarios-common-buflist "127.0.0.1")))
+
+    (with-current-buffer erc-serv-buf-a
+      (should (string= (buffer-name) serv-buf-a))
+      (funcall expect 8 "debug mode")
+      (erc-cmd-JOIN "#chan"))
+
+    (with-current-buffer erc-serv-buf-b
+      (should (string= (buffer-name) serv-buf-b))
+      (funcall expect 8 "debug mode")
+      (erc-cmd-JOIN "#chan"))
+
+    (erc-d-t-wait-for 10 (get-buffer chan-buf-a))
+    (erc-d-t-wait-for 10 (get-buffer chan-buf-b))
+
+    (ert-info ("Greets other nick in same channel")
+      (with-current-buffer chan-buf-a
+        (funcall expect 5 "chester")
+        (funcall expect 5 "find the forester")
+        (erc-cmd-MSG "#chan chester: hi")))
+
+    (ert-info ("Sees other nick in same channel")
+      (with-current-buffer chan-buf-b
+        (funcall expect 5 "tester")
+        (funcall expect 10 "<tester> chester: hi")
+        (funcall expect 5 "This was lofty")
+        (erc-cmd-MSG "#chan hi tester")))
+
+    (with-current-buffer chan-buf-a
+      (funcall expect 5 "To employ you towards")
+      (erc-cmd-QUIT ""))
+
+    (with-current-buffer chan-buf-b
+      (funcall expect 5 "To employ you towards")
+      (erc-cmd-QUIT ""))))
+
+(ert-deftest erc-scenarios-base-network-id-same-network--two-ids ()
+  :tags '(:expensive-test)
+  (erc-scenarios-common--base-network-id-same-network
+   (list :nick "tester"
+         :id 'tester/foonet
+         :server "tester/foonet"
+         :chan "#chan@tester/foonet")
+   (list :nick "chester"
+         :id 'chester/foonet
+         :server "chester/foonet"
+         :chan "#chan@chester/foonet")))
+
+(ert-deftest erc-scenarios-base-network-id-same-network--one-id-tester ()
+  :tags '(:expensive-test)
+  (erc-scenarios-common--base-network-id-same-network
+   (list :nick "tester"
+         :id 'tester/foonet
+         :server "tester/foonet"
+         :chan "#chan@tester/foonet")
+   (list :nick "chester"
+         :id nil
+         :server "foonet"
+         :chan "#chan@foonet")))
+
+(ert-deftest erc-scenarios-base-network-id-same-network--one-id-chester ()
+  :tags '(:expensive-test)
+  (erc-scenarios-common--base-network-id-same-network
+   (list :nick "tester"
+         :id nil
+         :server "foonet"
+         :chan "#chan@foonet")
+   (list :nick "chester"
+         :id 'chester/foonet
+         :server "chester/foonet"
+         :chan "#chan@chester/foonet")))
+
+(ert-deftest erc-scenarios-base-network-id-same-network--no-ids ()
+  :tags '(:expensive-test)
+  (erc-scenarios-common--base-network-id-same-network
+   (list :nick "tester"
+         :id nil
+         :server "foonet/tester"
+         :chan "#chan@foonet/tester") ; <- note net before nick
+   (list :nick "chester"
+         :id nil
+         :server "foonet/chester"
+         :chan "#chan@foonet/chester")))
+
+;;; erc-scenarios-base-network-id-samenet.el ends here