[#xxxx] policy: Test very large entity name

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

tests/policy_test.go

@@ -100,6 +100,12 @@ func TestPolicy(t *testing.T) {
 		checkTargets(t, e, policy.Namespace, [][]byte{[]byte("mynamespace")})
 		checkTargets(t, e, policy.Container, [][]byte{[]byte("cnr1")})
 	})
+
+	t.Run("large entityname", func(t *testing.T) {
+		largeEntityName := "thisisverylargeentitynamethatcontainverylargenamespaceanduseraddress"
+		e.Invoke(t, stackitem.Null{}, "addChain", policy.User, largeEntityName, "s3:somerule", p1)
+		checkTargets(t, e, policy.User, [][]byte{[]byte(largeEntityName)})
+	})
 }
 
 func TestAutorization(t *testing.T) {