test: use toBe, not snapshot (?)

Signed-off-by: 0x009922 <[email protected]>

Author: 0x009922

packages/core/test/misc.spec.ts

@@ -58,11 +58,7 @@ describe('JSON/string serialisation', () => {
   })
 
   test('Timestamp serialises as ISO string', () => {
-    expect({ timestamp: dm.Timestamp.fromDate(new Date(1022, 10, 10)) }).toMatchInlineSnapshot(`
-      {
-        "timestamp": "1022-11-09T14:41:01.000Z",
-      }
-    `)
+    expect(dm.Timestamp.fromDate(new Date(1022, 10, 10, 0, 0, 0, 0)).toJSON()).toBe('1022-11-09T14:41:01.000Z')
   })
 })