Use lexical-binding in warnings.el and add tests

* lisp/warnings.el: Use lexical-binding.
Remove redundant :group args.

* test/lisp/warnings-tests.el: New file.

lisp/emacs-lisp/warnings.el

@@ -1,4 +1,4 @@
-;;; warnings.el --- log and display warnings
+;;; warnings.el --- log and display warnings  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 2002-2020 Free Software Foundation, Inc.
 
@@ -74,7 +74,6 @@ it may not itself be an alias.")
 If a warning's severity level is lower than this,
 the warning is logged in the warnings buffer, but the buffer
 is not immediately displayed.  See also `warning-minimum-log-level'."
-  :group 'warnings
   :type '(choice (const :emergency) (const :error)
                  (const :warning) (const :debug))
   :version "22.1")
@@ -86,7 +85,6 @@ If a warning severity level is lower than this,
 the warning is completely ignored.
 Value must be lower or equal than `warning-minimum-level',
 because warnings not logged aren't displayed either."
-  :group 'warnings
   :type '(choice (const :emergency) (const :error)
                  (const :warning) (const :debug))
   :version "22.1")
@@ -100,7 +98,6 @@ Thus, (foo bar) as an element matches (foo bar)
 or (foo bar ANYTHING...) as TYPE.
 If TYPE is a symbol FOO, that is equivalent to the list (FOO),
 so only the element (FOO) will match it."
-  :group 'warnings
   :type '(repeat (repeat symbol))
   :version "22.1")
 
@@ -115,7 +112,6 @@ or (foo bar ANYTHING...) as TYPE.
 If TYPE is a symbol FOO, that is equivalent to the list (FOO),
 so only the element (FOO) will match it.
 See also `warning-suppress-log-types'."
-  :group 'warnings
   :type '(repeat (repeat symbol))
   :version "22.1")
 

test/lisp/emacs-lisp/warnings-tests.el

@@ -0,0 +1,60 @@
+;;; warnings-tests.el --- tests for warnings.el  -*- lexical-binding: t; -*-
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'warnings)
+
+(ert-deftest test-warning-suppress-p ()
+  (should (warning-suppress-p 'foo '((foo))))
+  (should (warning-suppress-p '(foo bar) '((foo bar))))
+  (should (warning-suppress-p '(foo bar baz) '((foo bar))))
+  (should-not (warning-suppress-p '(foo bar baz) '((foo bax))))
+  (should-not (warning-suppress-p 'foobar nil)))
+
+(ert-deftest test-display-warning ()
+  (dolist (level '(:emergency :error :warning))
+    (with-temp-buffer
+      (display-warning '(foo) "Hello123" level (current-buffer))
+      (should (string-match "foo" (buffer-string)))
+      (should (string-match "Hello123" (buffer-string))))
+    (with-current-buffer "*Messages*"
+      (should (string-match "Hello123" (buffer-string))))))
+
+(ert-deftest test-display-warning/warning-minimum-level ()
+  ;; This test only works interactively:
+  :expected-result :failed
+  (let ((warning-minimum-level :emergency))
+    (with-temp-buffer
+      (display-warning '(foo) "baz" :warning (current-buffer)))
+    (with-current-buffer "*Messages*"
+      (should-not (string-match "baz" (buffer-string))))))
+
+(ert-deftest test-display-warning/warning-minimum-log-level ()
+  (let ((warning-minimum-log-level :error))
+    (with-temp-buffer
+      (display-warning '(foo) "hello" :warning (current-buffer))
+      (should-not (string-match "hello" (buffer-string))))))
+
+(provide 'warnings-tests)
+
+;;; warnings-tests.el ends here