Thanks to Karl Fogel for pre-commit review.
* lisp/bookmark.el (bookmark-delete-all): New function to delete all
bookmarks.
(bookmark-bmenu-mark-all): New function to mark all bookmarks in the
bookmark list buffer.
(bookmark-bmenu-unmark-all): New function to unmark all bookmarks in
the bookmark list buffer.
(bookmark-bmenu-delete-all): New function to mark for deletion all
bookmarks in the bookmark list buffer.
(bookmark-map): Map "D" to `bookmark-delete-all'.
(bookmark-bmenu-mode-map): New mappping for "M" to
`bookmark-bmenu-mark-all'.
(bookmark-bmenu-mode-map): New mappping for "U" to
`bookmark-bmenu-unmark-all'.
(bookmark-bmenu-mode-map): New mappping for "D" to
`bookmark-bmenu-delete-all'.
(bookmark-bmenu-mark-all): New bookmark menu to
`bookmark-delete-all'.
(easy-menu-define): New bookmark menu to `bookmark-bmenu-mark-all'.
(easy-menu-define): New bookmark menu to
`bookmark-bmenu-unmark-all'.
(easy-menu-define): New bookmark menu to
`bookmark-bmenu-delete-all'.
(bookmark-bmenu-select): Update docstring to include a reference to
`bookmark-bmenu-mark-all'.
(bookmark-bmenu-mode): Update docstring. Add/Update description:
`bookmark-bmenu-mark-all', `bookmark-bmenu-delete-all',
`bookmark-bmenu-execute-deletions', and `bookmark-bmenu-unmark-all'.
* test/lisp/bookmark-resources/test-list.bmk: New bookmark file to
test a list of bookmarks.
* test/lisp/bookmark-tests.el (bookmark-tests-bookmark-file-list): New
reference to the bookmark file used for testing a list of bookmarks.
(bookmark-tests-bookmark-list-0, bookmark-tests-bookmark-list-1,
bookmark-tests-bookmark-list-2): New cached values for testing a
list of bookmark.
(bookmark-tests-cache-timestamp-list): New variable to set
`bookmark-bookmarks-timestamp'.
(with-bookmark-test-list): New macro environment to test a list of
bookmarks.
(with-bookmark-test-file-list): New macro environment to test a list
of bookmarks with example.txt.
(with-bookmark-bmenu-test-list): New macro environment to test
functions about a list of bookmarks from `bookmark-bmenu-list'.
(bookmark-tests-all-names-list, bookmark-tests-get-bookmark-list,
bookmark-tests-get-bookmark-record-list): New functions to test the
records of the list of bookmarks.
(bookmark-tests-make-record-list): New function to test the creation
of a record from example.txt with a list of bookmarks loaded.
(bookmark-tests-delete-all): New function to test
`bookmark-delete-all'.
(bookmark-test-bmenu-any-marks-list): New function to test
`bookmark-bmenu-any-marks' with a list of bookmarks.
(bookmark-test-bmenu-mark-all): New function to test
`bookmark-bmenu-mark-all'.
(bookmark-test-bmenu-unmark-all): New function to test
`bookmark-bmenu-unmark-all'.
(bookmark-test-bmenu-delete-all): New function to test
`bookmark-bmenu-delete-all'.