Add some tests to find-func.el

1 files changed, 63 insertions, 0 deletions

diff --git a/test/lisp/emacs-lisp/find-func-tests.el b/test/lisp/emacs-lisp/find-func-tests.el
index 03df4bb9ff4..3960aff2a59 100644
--- a/test/lisp/emacs-lisp/find-func-tests.el
+++ b/test/lisp/emacs-lisp/find-func-tests.el
@@ -27,6 +27,7 @@
 ;;; Code:
 
 (require 'ert-x)                        ;For `ert-run-keys'.
+(require 'find-func)
 
 (ert-deftest find-func-tests--library-completion () ;bug#43393
   ;; FIXME: How can we make this work in batch (see also
@@ -43,6 +44,68 @@
                      (concat data-directory (kbd "n x / TAB RET"))
                    (read-library-name)))))
 
+(ert-deftest find-func-tests--locate-symbols ()
+  (should (cdr
+           (find-function-search-for-symbol
+            #'goto-line nil "simple")))
+  (should (cdr
+           (find-function-search-for-symbol
+            'minibuffer-history 'defvar "simple")))
+  (should (cdr
+           (find-function-search-for-symbol
+            'with-current-buffer nil "subr")))
+  (should (cdr
+           (find-function-search-for-symbol
+            'font-lock-warning-face 'defface "font-lock")))
+  (should-not (cdr
+               (find-function-search-for-symbol
+                'wrong-variable 'defvar "simple")))
+  (should-not (cdr
+               (find-function-search-for-symbol
+                'wrong-function nil "simple")))
+  (should (cdr (find-function-noselect #'goto-line)))
+  (should (cdr (find-function-noselect #'goto-char)))
+  ;; Setting LISP-ONLY and passing a primitive should error.
+  (should-error (find-function-noselect #'goto-char t))
+  (should-error (find-function-noselect 'wrong-function)))
+
+(defun test-locate-helper (func &optional expected-result)
+  "Assert on the result of `find-function-library' for FUNC.
+EXPECTED-RESULT is an alist (FUNC . LIBRARY) with the
+expected function symbol and function library, respectively."
+  (cl-destructuring-bind (orig-function . library)
+      (find-function-library func)
+    (cl-destructuring-bind (expected-func . expected-library)
+        expected-result
+      (should (eq orig-function expected-func))
+      (should (and
+               (not (string-empty-p expected-library))
+               (string-match-p expected-library library))))))
+
+(ert-deftest find-func-tests--locate-library ()
+  (test-locate-helper #'goto-line '(goto-line . "simple"))
+  (test-locate-helper #'forward-char '(forward-char . "cmds.c"))
+  (should-error (test-locate-helper 'wrong-function)))
+
+(ert-deftest find-func-tests--locate-adviced-symbols ()
+  (defun my-message ()
+    (message "Hello!"))
+  (advice-add #'mark-sexp :around 'my-message)
+  (test-locate-helper #'mark-sexp '(mark-sexp . "lisp"))
+  (advice-remove #'mark-sexp 'my-message))
+
+(ert-deftest find-func-tests--find-library-verbose ()
+  (find-function-library #'join-line nil t)
+  (with-current-buffer "*Messages*"
+    (save-excursion
+      (goto-char (point-max))
+      (skip-chars-backward "\n")
+      (should (string-match-p
+               ".join-line. is an alias for .delete-indentation."
+               (buffer-substring
+                (line-beginning-position)
+                (point)))))))
+
 ;; Avoid a byte-compilation warning that may confuse people reading
 ;; the result of the following test.
 (declare-function compilation--message->loc nil "compile")