Add a test for a query that produces a nil :db/id

Author: devurandom

test/datascript/test/query_or.cljc

@@ -65,7 +65,12 @@
          (and [2  :age  ?a]
               [?e :name "Oleg"]))
      [?e :age ?a]]
-    #{1 5 4}))
+    #{1 5 4}
+
+    [[?top :name "Ivan"]
+     [?top :age 10]
+     [(or ?e ?top)]]
+    #{}))
 
 (deftest test-or-join
   (are [q res] (= (d/q (concat '[:find ?e :where] (quote q)) @test-db)
@@ -157,4 +162,4 @@
         (d/q '[:find ?e
                :where (or-join [[?e]]
                         [?e :name "Ivan"])]
-             @test-db))))
+             @test-db))))