Add extra tests

packages/backend-core/src/db/couch/tests/DatabaseImpl.spec.ts

@@ -81,5 +81,38 @@ describe("DatabaseImpl", () => {
         })
       }
     })
+
+    it("keeps existing createdAt", async () => {
+      const ids = generator.unique(() => generator.guid(), 2)
+
+      await db.bulkDocs(ids.map(id => ({ _id: id })))
+      tk.travel(100)
+
+      const newDocs = generator
+        .unique(() => generator.guid(), 3)
+        .map(id => ({ _id: id }))
+      const docsToUpdate = await Promise.all(
+        ids.map(async id => ({ ...(await db.get(id)), newValue: 123 }))
+      )
+      await db.bulkDocs([...newDocs, ...docsToUpdate])
+
+      for (const { _id } of docsToUpdate) {
+        expect(await db.get(_id)).toEqual({
+          _id,
+          _rev: expect.any(String),
+          newValue: 123,
+          createdAt: initialTime.toISOString(),
+          updatedAt: new Date().toISOString(),
+        })
+      }
+      for (const { _id } of newDocs) {
+        expect(await db.get(_id)).toEqual({
+          _id,
+          _rev: expect.any(String),
+          createdAt: new Date().toISOString(),
+          updatedAt: new Date().toISOString(),
+        })
+      }
+    })
   })
 })