Add a test to ensure there's no regression on bug

Also introduce helper fn for common db fixture setup

src/test/frontend/handler/editor_test.cljs

@@ -1,9 +1,14 @@
 (ns frontend.handler.editor-test
   (:require [frontend.handler.editor :as editor]
-            [clojure.test :refer [deftest is testing are]]
+            [frontend.db :as db]
+            [clojure.test :refer [deftest is testing are use-fixtures]]
+            [datascript.core :as d]
+            [frontend.test.helper :as test-helper :refer [load-test-files]]
             [frontend.state :as state]
             [frontend.util.cursor :as cursor]))
 
+(use-fixtures :each test-helper/start-and-destroy-db)
+
 (deftest extract-nearest-link-from-text-test
   (testing "Page, block and tag links"
     (is (= "page1"
@@ -213,3 +218,24 @@
         "No page search within backticks"))
   ;; Reset state
   (state/set-editor-action! nil))
+
+(deftest save-block-aux!
+  (load-test-files [{:file/path "pages/page1.md"
+                     :file/content "\n
+- b1 #foo"}])
+  (testing "updating block's content changes content and preserves path-refs"
+   (let [conn (db/get-db test-helper/test-db false)
+         block (->> (d/q '[:find (pull ?b [* {:block/path-refs [:block/name]}])
+                           :where [?b :block/content "b1 #foo"]]
+                         @conn)
+                    ffirst)
+         prev-path-refs (set (map :block/name (:block/path-refs block)))
+         _ (assert (= #{"page1" "foo"} prev-path-refs)
+                   "block has expected :block/path-refs")
+         ;; Use same options as edit-box-on-change!
+         _ (editor/save-block-aux! block "b12 #foo" {:skip-properties? true})
+         updated-block (d/pull @conn '[* {:block/path-refs [:block/name]}] [:block/uuid (:block/uuid block)])]
+     (is (= "b12 #foo" (:block/content updated-block)) "Content updated correctly")
+     (is (= prev-path-refs
+            (set (map :block/name (:block/path-refs updated-block))))
+         "Path-refs remain the same"))))