added missing assertion in test.

solventmapcreator/test/solvationcalculationtest/fractionaloccupancycalculatortest.py

@@ -29,6 +29,7 @@ class FractionalOccupancyCalculatorTestCase(unittest.TestCase):
         expected_value = (55.35 * 4.0 /300.0) + (0.001/300)
         actual_value = fractionaloccupancycalculator.calculate_fractional_occupancy_for_phase("resources/watersolvent.xml",
                                                                                               "water", 0.001)
+        self.assertAlmostEqual(expected_value, actual_value)
     def test_calculate_fractional_occupancy_contribution_from_solute(self):
         """Test to see if expected value is returned.
         """