test-org-protocol.el: Add expected failures for file:/// URLs

* testing/lisp/test-org-protocol.el
(test-org-protocol/org-protocol-store-link-file,
test-org-protocol/org-protocol-capture-file): Add tests to document
that existing calls to `org-protocol-sanitize-uri' could make passed
URLs invalid by changing number of slashes after scheme.

Till a fix of the problem the new tests are marked as expected failures.

Unless a relatively recent commit 5748615c48, I would believe that
`org-protocol-sanitize-uri' was added by mistake to the initial
implementation.  Capture URLs are anyway escaped with percent encoding.

testing/lisp/test-org-protocol.el

@@ -78,6 +78,16 @@
     (should (null (org-protocol-check-filename-for-protocol uri (list uri) nil)))
     (should (equal (car org-stored-links) '("URL3" "TITLE3")))))
 
+(ert-deftest test-org-protocol/org-protocol-store-link-file ()
+  "store-link: `org-protocol-sanitize-uri' could distort URL."
+  :expected-result :failed
+  (let ((uri "/org-protocol:/store-link:/file%3A%2F%2F%2Fetc%2Fmailcap/Triple%20Slash"))
+    (should (null (org-protocol-check-filename-for-protocol uri (list uri) nil)))
+    (should (equal (car org-stored-links) '("file:///etc/mailcap" "Triple Slash"))))
+  (let ((uri "/org-protocol:/store-link?url=file%3A%2F%2F%2Fetc%2Fmailcap&title=Triple%20Slash"))
+    (should (null (org-protocol-check-filename-for-protocol uri (list uri) nil)))
+    (should (equal (car org-stored-links) '("file:///etc/mailcap" "Triple Slash")))))
+
 (ert-deftest test-org-protocol/org-protocol-capture ()
   "Test `org-protocol-capture' specifications."
   (let* ((org-protocol-default-template-key "t")
@@ -134,6 +144,20 @@
      test-urls)
     (delete-file temp-file-name)))
 
+(ert-deftest test-org-protocol/org-protocol-capture-file ()
+  "capture: `org-protocol-sanitize-uri' could distort URL."
+  :expected-result :failed
+  (let* ((org-protocol-default-template-key "t")
+	 (temp-file-name (make-temp-file "org-protocol-test"))
+	 (org-capture-templates
+	  `(("t" "Test" plain (file ,temp-file-name) "%a\n%i\n" :kill-buffer t))))
+    (let ((uri "/org-protocol:/capture:/t/file%3A%2F%2F%2Fetc%2Fmailcap/Triple%20Slash/Body"))
+      (should (null (org-protocol-check-filename-for-protocol uri (list uri) nil)))
+      (should (string= (buffer-string) "[[file:///etc/mailcap][Triple Slash]]\nBody")))
+    (let ((uri "/org-protocol:/capture?template=t&url=file%3A%2F%2F%2Fetc%2Fmailcap&title=Triple%20Slash&body=Body"))
+      (should (null (org-protocol-check-filename-for-protocol uri (list uri) nil)))
+      (should (string= (buffer-string) "[[file:///etc/mailcap][Triple Slash]]\nBody")))))
+
 (ert-deftest test-org-protocol/org-protocol-open-source ()
   "Test org-protocol://open-source links."
   (let* ((temp-file-name1 (make-temp-file "org-protocol-test1"))