Adds test for solver

tests/solver/test_solve_basic_fixed_z.py

@@ -0,0 +1,25 @@
+from pdme.model import FixedZPlaneModel
+from pdme.measurement import OscillatingDipole, OscillatingDipoleArrangement
+import logging
+import numpy
+import itertools
+import pdme.solver
+
+
+def test_fixed_z_plane_model_solve_basic():
+	# Initialise our dipole arrangement and create dot measurements along a square.
+	dipoles = OscillatingDipoleArrangement([OscillatingDipole((0, 0, 2), (1, 2, 4), 1)])
+	dot_inputs = list(itertools.chain.from_iterable(
+		(([1, 2, 0], f), ([1, 1, 0], f), ([2, 1, 0], f), ([2, 2, 0], f)) for f in numpy.arange(1, 10, 2)
+	))
+	dots = dipoles.get_dot_measurements(dot_inputs)
+
+	model = FixedZPlaneModel(4, -10, 10, -10, 10, 1)
+
+	# from the dipole, these are the unspecified variables in ((0, 0, pz), (sx, sy, 4), w)
+	expected_solution = [2, 1, 2, 1]
+
+	result = pdme.solver.sol(model, dots)
+	logging.info(result)
+	assert result.success
+	numpy.testing.assert_allclose(result.x, expected_solution, err_msg="Even well specified problem solution was wrong.", rtol=1e-6, atol=1e-11)