Adds tests for notimplemented methods

tests/model/test_model_interface.py

@@ -0,0 +1,29 @@
+from pdme.model import Model
+from pdme.measurement import DotMeasurement
+import pytest
+
+
+def test_model_interface_not_implemented_point_length():
+	model = Model()
+	with pytest.raises(NotImplementedError):
+		model.point_length()
+
+
+def test_model_interface_not_implemented_cost():
+	model = Model()
+
+	model.point_length = lambda: 2
+
+	with pytest.raises(NotImplementedError):
+		cost = model.costs([DotMeasurement(0, [1, 2, 3], 4)])
+		cost([1, 2])
+
+
+def test_model_interface_not_implemented_jac():
+	model = Model()
+
+	model.point_length = lambda: 2
+
+	with pytest.raises(NotImplementedError):
+		jac = model.jac([DotMeasurement(0, [1, 2, 3], 4)])
+		jac([1, 2])