fix async test failures

Author: Danny McClanahan

markdown-mode.el

@@ -6089,7 +6089,9 @@ the rendered output."
   (when (buffer-live-p markdown-live-preview-view-buffer)
     ;; calls `kill-buffer-hook' within `markdown-live-preview-view-buffer'
     (kill-buffer markdown-live-preview-view-buffer))
-  (when (process-live-p markdown-live-preview-currently-exporting-process)
+  (when (and markdown-live-preview-currently-exporting-process
+             (process-live-p markdown-live-preview-currently-exporting-process))
+    (set-process-sentinel markdown-live-preview-currently-exporting-process nil)
     (delete-process markdown-live-preview-currently-exporting-process))
   (setq markdown-live-preview-view-buffer nil
         markdown-live-preview-currently-exporting-process nil)
@@ -6716,7 +6718,8 @@ before regenerating font-lock rules for extensions."
   :group 'markdown-mode
   :lighter " MD-Preview"
   (if markdown-live-preview-mode
-      (markdown-live-preview-setup)
+      (condition-case nil (markdown-live-preview-setup)
+        (error (markdown-live-preview-mode -1)))
     (markdown-live-preview-teardown-source)))
 
 

tests/markdown-test.el

@@ -3755,8 +3755,6 @@ Detail: https://github.com/jrblevin/markdown-mode/issues/79"
 
 (defun markdown-test/live-preview-exports ()
   (markdown-test-temp-file "inline.text"
-    (unless (require 'eww nil t)
-      (should-error (markdown-live-preview-mode)))
     (let ((markdown-live-preview-idle-delay .01))
       (markdown-temp-eww
        (markdown-live-preview-mode)
@@ -3775,6 +3773,8 @@ Detail: https://github.com/jrblevin/markdown-mode/issues/79"
 
 (ert-deftest test-markdown-ext/live-preview-exports-sync ()
   (let ((markdown-live-preview-do-sync t))
+    (unless (require 'eww nil t)
+      (should-error (markdown-live-preview-sync-export)))
     (markdown-test/live-preview-exports)))
 
 (ert-deftest test-markdown-ext/live-preview-exports-async ()