From 17c732d94cc9c40671a9a7635177c2d5017f5902 Mon Sep 17 00:00:00 2001
From: NicolaCourtier <45851982+NicolaCourtier@users.noreply.github.com>
Date: Fri, 17 Nov 2023 18:00:44 +0000
Subject: [PATCH] Add test of StandaloneCosts

---
 tests/unit/test_optimisation.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tests/unit/test_optimisation.py b/tests/unit/test_optimisation.py
index b9d3b041..406c89ee 100644
--- a/tests/unit/test_optimisation.py
+++ b/tests/unit/test_optimisation.py
@@ -1,6 +1,7 @@
 import pybop
 import numpy as np
 import pytest
+from pybop.costs.standalone import StandaloneCost
 
 
 class TestOptimisation:
@@ -8,6 +9,20 @@ class TestOptimisation:
     A class to test the optimisation class.
     """
 
+    @pytest.mark.unit
+    def test_standalone(self):
+        # Build an Optimisation problem with a StandaloneCost
+        cost = StandaloneCost()
+
+        opt = pybop.Optimisation(cost=cost, optimiser=pybop.NLoptOptimize)
+
+        assert len(opt.x0) == opt.n_parameters
+
+        x, final_cost = opt.run()
+
+        np.testing.assert_allclose(x, 0, atol=1e-2)
+        np.testing.assert_allclose(final_cost, 42, atol=1e-2)
+
     @pytest.mark.unit
     def test_prior_sampling(self):
         # Tests prior sampling