bug#65475: 29.1; package-selected-packages variable is not updated when the last package is deleted

[Philip Kaludercic <philipk@posteo.net>]

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Stefan Kangas <stefankangas@gmail.com> writes:

> Philip Kaludercic <philipk@posteo.net> writes:
>
>>> If we really can't find a better option, we need to add a bunch of
>>> comments explaining why we ended up with such a hack.
>>
>> It seems that it is only necessary to bind `package-alist' during the
>> invocation of `package--used-elsewhere-p', so this is a more
>> conservative proposal:
>
> Any chance we could add a unit test for this?  It's been a while since I
> last looked at package-tests.el.
>
> Other than that, LGTM.

How does this look like:


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From e865604c6a9d06cb986752e28b9ae88d7bc8011e Mon Sep 17 00:00:00 2001
From: Philip Kaludercic <philipk@posteo.net>
Date: Thu, 14 Sep 2023 15:09:19 +0200
Subject: [PATCH] package-tests.el: Add test Bug#65475

* test/lisp/emacs-lisp/package-tests.el (with-package-test): Bind
package-selected-packages.
(package-test-bug65475): Add test.
---
 test/lisp/emacs-lisp/package-tests.el | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/test/lisp/emacs-lisp/package-tests.el b/test/lisp/emacs-lisp/package-tests.el
index 113b4ec12a8..b55254bc036 100644
--- a/test/lisp/emacs-lisp/package-tests.el
+++ b/test/lisp/emacs-lisp/package-tests.el
@@ -125,6 +125,7 @@ with-package-test
             abbreviated-home-dir
             package--initialized
             package-alist
+            package-selected-packages
             ,@(if update-news
                   '(package-update-news-on-upload t)
                 (list (cl-gensym)))
@@ -307,6 +308,23 @@ package-test-bug58367
       (package-delete (cadr (assq 'v7-withsub package-alist))))
     ))
 
+(ert-deftest package-test-bug65475 ()
+  "Ensure deleting a package clears `package-selected-packages'."
+  (with-package-test (:basedir (ert-resource-directory))
+    (package-initialize)
+    (let* ((pkg-el "simple-single-1.3.el")
+           (source-file (expand-file-name pkg-el (ert-resource-directory))))
+      (should-not package-alist)
+      (should-not package-selected-packages)
+      (package-install-file source-file)
+      (should package-alist)
+      (should package-selected-packages)
+      (let ((desc (cadr (assq 'simple-single package-alist))))
+        (should desc)
+        (package-delete desc))
+      (should-not package-alist)
+      (should-not package-selected-packages))))
+
 (ert-deftest package-test-install-file-EOLs ()
   "Install same file multiple time with `package-install-file'
 but with a different end of line convention (bug#48137)."
-- 
2.39.2