https://github.com/AndreaCrotti/yasnippet-snippets/pull/509 breaks python-mode #517
Description
#509 introduced tests for python yasnippets, but at least on my box running Emacs 30, ert is not automatically loaded and that results in the following ugly backtrace:
Debugger entered--Lisp error: (void-function ert-set-test)
ert-set-test(test-split #s(ert-test test-split "For starters, only test a single string for expected output." #[0 "\300C\3011\23\0\302\303!\304\305\306\307FD0\202\36\0\1\310\240\210\211@\1AD\262\1\311C\312C\313\314\2\4\6\6\6\10%\216\1\315\5\242\5\"\240)\204<\0\316\1\242!\210\312\207" [equal (error) python-split-args "_foo='this', bar: int = 2, baz: Optional[My_Type], foobar" ("_foo" nil "'this'") ("bar" "int" "2") ("baz" "Optional[My_Type]" nil) ("foobar" nil nil) signal ert-form-evaluation-aborted-3 nil make-closure #[0 "\300\304\305\303\242\302BE\301\242\306=?\205\24\0\307\301\242D\244\301\242\306=?\205,\0\310\311!\211\205*\0\312\313\2\302\"D\262\1\244\240\210\314\300\242!\207" [V0 V1 V2 V3 (should (equal (python-split-args "_foo='this', bar: int = 2, baz: Optional[My_Type], foobar") (list ... ... ... ...))) :form ert-form-evaluation-aborted-3 :value ert--get-explainer equal :explanation apply ert--signal-should-execution] 7] apply ert-fail] 11] nil :passed nil "/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode/.yas-setup.el"))
byte-code("\300\301\302\303\304\301\305\4\306\307\306\310&\10\262\1\"\210\300\311\312\303\304\311\313\4\306\307\306\310&\10\262\1\"\207" [ert-set-test test-split #f(compiled-function () #<bytecode -0x156571f17b848243>) record ert-test "For starters, only test a single string for expected output." nil :passed "/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode/.yas-setup.el" test-argument-self #f(compiled-function () #<bytecode 0x680c65d26890c07>) "If an argument is called `self`, it must be omitted"] 12)
yas--load-yas-setup-file("/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode/.yas-setup")
yas--load-directory-2("/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode" python-mode)
yas--load-directory-1("/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode" python-mode)
apply(yas--load-directory-1 ("/home/dan/.emacs.d/elpa/yasnippet-snippets-20250507.834/snippets/python-mode" python-mode))
#f(compiled-function (&rest args2) #<bytecode -0x8922459b7ee3dd9>)()
yas--load-pending-jits()
yas-minor-mode()
run-hooks(change-major-mode-after-body-hook prog-mode-hook python-base-mode-hook python-mode-hook)
apply(run-hooks change-major-mode-after-body-hook (prog-mode-hook python-base-mode-hook python-mode-hook))
run-mode-hooks(python-mode-hook)
python-mode()
set-auto-mode-0(python-mode nil)
set-auto-mode--apply-alist((("^yang\\.settings$" . jsonc-mode) ("\\.tf\\'" . terraform-mode) ("Dockerfile\\'" . dockerfile-mode) ("dune-project" . dune-mode) ("dune" . dune-mode) ("\\.mlp$\\'" . tuareg-mode) ("\\.mli$\\'" . tuareg-mode) ("\\.ml$\\'" . tuareg-mode) ("_service\\'" . nxml-mode) ("^_link\\'" . nxml-mode) ("\\.rng\\'" . nxml-mode) ("\\.xsd\\'" . nxml-mode) ("\\.xml\\'" . nxml-mode) ("config\\'" . i3wm-config-mode) ("\\.asciidoc\\'" . adoc-mode) ("\\.adoc\\'" . adoc-mode) ("\\.sls$\\'" . salt-mode) ("meson.build'" . meson-mode) ("\\.org$" . org-mode) ("\\.json?\\'" . json-mode) ("\\.js\\'" . js-mode) ("\\.ts\\'" . typescript-mode) ("\\.html?\\'" . web-mode) ("\\.rest$" . rst-mode) ("\\.rst$" . rst-mode) ("\\.spec'" . rpm-spec-mode) ("\\.gitlab-ci\\.yml\\'" . gitlab-ci-mode) ("\\.yml\\'" . yaml-mode) ("\\.markdown\\'" . markdown-mode) ("\\.md\\'" . markdown-mode) ("README\\.md\\'" . gfm-mode) ("\\.tex\\'" . LaTeX-mode) ("CMakeCompiler\\.txt\\'" . cmake-mode) ("CMakeGlobals\\.txt\\'" . cmake-mode) ("SConscript" . python-mode) ("SConstruct" . python-mode) ("\\.py\\'" . python-mode) ("\\.hrl\\'" . erlang-mode) ("\\.erl\\'" . erlang-mode) ("\\.desktop\\(\\.in\\)?$" . desktop-entry-mode) ("CMakeLists\\.txt\\'" . cmake-mode) ("\\.cmake\\'" . cmake-mode) (".at'" . autotest-mode) ("\\.a\\(?:scii\\)?doc\\'" . adoc-mode) ("\\.hva\\'" . LaTeX-mode) ("\\.bats\\'" . bats-mode) ("\\.cmake\\'" . cmake-mode) ("CMakeLists\\.txt\\'" . cmake-mode) ("\\.dockerfile\\'" . dockerfile-mode) ("[/\\]\\(?:Containerfile\\|Dockerfile\\)\\(?:\\.[^/\\]*\\)?\\'" . dockerfile-mode) ...) nil nil)
set-auto-mode()
normal-mode(t)
after-find-file(nil t)
find-file-noselect-1(#<buffer api_cve.py> "~/suse/gitlab.suse.de/packtrack/packtrack/packtrack/client/api/api_cve.py" nil nil "~/suse/gitlab.suse.de/packtrack/packtrack/packtrack/client/api/api_cve.py" (3456764 42))
find-file-noselect("/home/dan/suse/gitlab.suse.de/packtrack/packtrack/packtrack/client/api/api_cve.py" nil nil nil)
find-file("/home/dan/suse/gitlab.suse.de/packtrack/packtrack/packtrack/client/api/api_cve.py")
projectile--find-file(nil)
projectile-find-file(nil)
funcall-interactively(projectile-find-file nil)
command-execute(projectile-find-file)
The issue can be worked around by adding a (require 'ert) at the top of snippets/python-mode/.yas-setup.el, but I'm unsure if that isn't overkill.