1 files changed, 83 insertions, 0 deletions
diff --git a/test/src/process-tests.el b/test/src/process-tests.el
index 7cccc5a02cb..514bd04da4e 100644
--- a/test/src/process-tests.el
+++ b/test/src/process-tests.el
@@ -181,5 +181,88 @@
               (should-not (process-query-on-exit-flag process))))
         (kill-process process)))))
 
+;; Return t if OUTPUT could have been generated by merging the INPUTS somehow.
+(defun process-tests--mixable (output &rest inputs)
+  (while (and output (let ((ins inputs))
+                       (while (and ins (not (eq (car (car ins)) (car output))))
+                         (setq ins (cdr ins)))
+                       (if ins
+                           (setcar ins (cdr (car ins))))
+                       ins))
+    (setq output (cdr output)))
+  (not (apply #'append output inputs)))
+
+(ert-deftest make-process/mix-stderr ()
+  "Check that `make-process' mixes the output streams if STDERR is nil."
+  (skip-unless (executable-find "bash"))
+  ;; Frequent random (?) failures on hydra.nixos.org, with no process output.
+  ;; Maybe this test should be tagged unstable?  See bug#31214.
+  (skip-unless (not (getenv "EMACS_HYDRA_CI")))
+  (with-temp-buffer
+    (let ((process (make-process
+                    :name "mix-stderr"
+                    :command (list "bash" "-c"
+                                   "echo stdout && echo stderr >&2")
+                    :buffer (current-buffer)
+                    :sentinel #'ignore
+                    :noquery t
+                    :connection-type 'pipe)))
+      (while (process-live-p process)
+        (accept-process-output process))
+      (should (eq (process-status process) 'exit))
+      (should (eq (process-exit-status process) 0))
+      (should (process-tests--mixable (string-to-list (buffer-string))
+                                      (string-to-list "stdout\n")
+                                      (string-to-list "stderr\n"))))))
+
+(ert-deftest make-process/file-handler/found ()
+  "Check that the ‘:file-handler’ argument of ‘make-process’
+works as expected if a file name handler is found."
+  (let ((file-handler-calls 0))
+    (cl-flet ((file-handler
+               (&rest args)
+               (should (equal default-directory "test-handler:/dir/"))
+               (should (equal args '(make-process :name "name"
+                                                  :command ("/some/binary")
+                                                  :file-handler t)))
+               (cl-incf file-handler-calls)
+               'fake-process))
+      (let ((file-name-handler-alist (list (cons (rx bos "test-handler:")
+                                                 #'file-handler)))
+            (default-directory "test-handler:/dir/"))
+        (should (eq (make-process :name "name"
+                                  :command '("/some/binary")
+                                  :file-handler t)
+                    'fake-process))
+        (should (= file-handler-calls 1))))))
+
+(ert-deftest make-process/file-handler/not-found ()
+  "Check that the ‘:file-handler’ argument of ‘make-process’
+works as expected if no file name handler is found."
+  (let ((file-name-handler-alist ())
+        (default-directory invocation-directory)
+        (program (expand-file-name invocation-name invocation-directory)))
+    (should (processp (make-process :name "name"
+                                    :command (list program "--version")
+                                    :file-handler t)))))
+
+(ert-deftest make-process/file-handler/disable ()
+  "Check ‘make-process’ works as expected if it shouldn’t use the
+file name handler."
+  (let ((file-name-handler-alist (list (cons (rx bos "test-handler:")
+                                             #'process-tests--file-handler)))
+        (default-directory "test-handler:/dir/")
+        (program (expand-file-name invocation-name invocation-directory)))
+    (should (processp (make-process :name "name"
+                                    :command (list program "--version"))))))
+
+(defun process-tests--file-handler (operation &rest _args)
+  (cl-ecase operation
+    (unhandled-file-name-directory "/")
+    (make-process (ert-fail "file name handler called unexpectedly"))))
+
+(put #'process-tests--file-handler 'operations
+     '(unhandled-file-name-directory make-process))
+
 (provide 'process-tests)
 ;; process-tests.el ends here.