diff --git a/test/middlewares.test.mjs b/test/middlewares.test.mjs
index c994efc..f67e70d 100644
--- a/test/middlewares.test.mjs
+++ b/test/middlewares.test.mjs
@@ -615,7 +615,10 @@ t.describe('#FormidableHandler()', function() {
 
     let err = await assert.isRejected(handler(ctx))
 
-    assert.strictEqual(err, assertError)
+    assert.notStrictEqual(err, assertError)
+    assert.ok(err instanceof HttpError)
+    assert.strictEqual(err.message, assertError.message)
+    assert.strictEqual(err.status, 400)
   })
 
   t.test('should throw rename error if rename fails', async function() {