From 0aa85dd219f4be8dbf3383661fd2b42370945b87 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 21 Jun 2026 03:19:08 -0400 Subject: test: make subr mocks variadic for native-comp, add arity meta-test Re-enabling native-comp surfaced a suite-wide fragility. When a test redefines a C primitive (or a native-compiled function), native-comp routes native callers through a trampoline that calls the mock with the primitive's maximum arity. A fixed-arity mock narrower than the primitive then throws wrong-number-of-arguments, intermittently, as the eln-cache fills. I swept every arity-narrow subr mock to append &rest _ (188 sites, preserving any named args the body uses), and added tests/test-meta-subr-mock-arity.el, which fails make test on any subr mock too narrow for the primitive's arity. The rule isn't "never mock a subr". The suite mocks message and completing-read freely. It's "a subr mock must accept the primitive's arity." Background, the three failure modes, and the research are in docs/native-comp-subr-mocking.org. --- tests/test-custom-buffer-file-print-diff-eww.el | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'tests/test-custom-buffer-file-print-diff-eww.el') diff --git a/tests/test-custom-buffer-file-print-diff-eww.el b/tests/test-custom-buffer-file-print-diff-eww.el index 9aa73cbee..56cc917e0 100644 --- a/tests/test-custom-buffer-file-print-diff-eww.el +++ b/tests/test-custom-buffer-file-print-diff-eww.el @@ -30,14 +30,14 @@ (let ((cj/print-spooler-command "lpr") (cj/print--spooler-cache nil)) (cl-letf (((symbol-function 'executable-find) - (lambda (cmd) (when (equal cmd "lpr") "/usr/bin/lpr")))) + (lambda (cmd &rest _) (when (equal cmd "lpr") "/usr/bin/lpr")))) (should (equal (cj/print--resolve-spooler) "lpr"))))) (ert-deftest test-cbf-resolve-spooler-explicit-string-missing-errors () "Error: explicit string spooler not on PATH signals user-error." (let ((cj/print-spooler-command "notathing") (cj/print--spooler-cache nil)) - (cl-letf (((symbol-function 'executable-find) (lambda (_) nil))) + (cl-letf (((symbol-function 'executable-find) (lambda (_ &rest _) nil))) (should-error (cj/print--resolve-spooler) :type 'user-error)))) (ert-deftest test-cbf-resolve-spooler-auto-detects-lpr-first () @@ -45,7 +45,7 @@ (let ((cj/print-spooler-command 'auto) (cj/print--spooler-cache nil)) (cl-letf (((symbol-function 'executable-find) - (lambda (cmd) (when (equal cmd "lpr") "/usr/bin/lpr")))) + (lambda (cmd &rest _) (when (equal cmd "lpr") "/usr/bin/lpr")))) (should (equal (cj/print--resolve-spooler) "lpr")) (should (equal cj/print--spooler-cache "lpr"))))) @@ -54,14 +54,14 @@ (let ((cj/print-spooler-command 'auto) (cj/print--spooler-cache nil)) (cl-letf (((symbol-function 'executable-find) - (lambda (cmd) (when (equal cmd "lp") "/usr/bin/lp")))) + (lambda (cmd &rest _) (when (equal cmd "lp") "/usr/bin/lp")))) (should (equal (cj/print--resolve-spooler) "lp"))))) (ert-deftest test-cbf-resolve-spooler-auto-no-tool-errors () "Error: `auto' with neither lpr nor lp signals user-error." (let ((cj/print-spooler-command 'auto) (cj/print--spooler-cache nil)) - (cl-letf (((symbol-function 'executable-find) (lambda (_) nil))) + (cl-letf (((symbol-function 'executable-find) (lambda (_ &rest _) nil))) (should-error (cj/print--resolve-spooler) :type 'user-error)))) (ert-deftest test-cbf-resolve-spooler-auto-returns-cached-value () @@ -69,7 +69,7 @@ (let ((cj/print-spooler-command 'auto) (cj/print--spooler-cache "cached-cmd")) (cl-letf (((symbol-function 'executable-find) - (lambda (_) (error "should not be called")))) + (lambda (_ &rest _) (error "should not be called")))) (should (equal (cj/print--resolve-spooler) "cached-cmd"))))) (ert-deftest test-cbf-resolve-spooler-invalid-value-errors () @@ -87,7 +87,7 @@ (with-temp-buffer (rename-buffer "*test-cbf-copy-name*" t) (cl-letf (((symbol-function 'kill-new) - (lambda (s) (setq killed s))) + (lambda (s &rest _) (setq killed s))) ((symbol-function 'message) (lambda (fmt &rest args) (setq msg (apply #'format fmt args))))) -- cgit v1.2.3