diff --git a/cherab/core/laser/tests/test_laserspectrum.py b/cherab/core/laser/tests/test_laserspectrum.py
index 9473e43d..6545f5c7 100644
--- a/cherab/core/laser/tests/test_laserspectrum.py
+++ b/cherab/core/laser/tests/test_laserspectrum.py
@@ -1,9 +1,11 @@
 import unittest
 import numpy as np
 
-from cherab.core.laser.laserspectrum import LaserSpectrum
+# The evaluate() method is not implemented in the base LaserSpectrum, so importing the simplest subclass.
+from cherab.core.model.laser.laserspectrum import ConstantSpectrum as LaserSpectrum
 from raysect.optical.spectrum import Spectrum
 
+
 class TestLaserSpectrum(unittest.TestCase):
 
     def test_laserspectrum_init(self):
@@ -24,12 +26,12 @@ def test_laserspectrum_init(self):
                                msg="LaserSpectrum did not raise a ValueError with max_wavelength < min_wavelength."):
             LaserSpectrum(40, 30, 200)
             LaserSpectrum(30, 30, 200)
-        
+
         # test bins > 0
         with self.assertRaises(ValueError,
-                               msg="LaserSpectrum did not raise a ValueError with max_wavelength < min_wavelength."):
-            LaserSpectrum(30, 30, 0)
-            LaserSpectrum(30, 30, -1)
+                               msg="LaserSpectrum did not raise a ValueError with bins <= 0."):
+            LaserSpectrum(30, 40, 0)
+            LaserSpectrum(30, 40, -1)
 
     def test_laserspectrum_changes(self):
         laser_spectrum = LaserSpectrum(100, 200, 100)
@@ -59,4 +61,4 @@ def test_laserspectrum_changes(self):
         # test caching of spectrum data, behaviour should be consistent with raysect.optical.spectrum.Spectrum
         self.assertTrue(np.array_equal(laser_spectrum.wavelengths, spectrum.wavelengths),
                         "LaserSpectrum.wavelengths values are not equal to Spectrum.wavelengths "
-                        "with same boundaries and number of bins")
\ No newline at end of file
+                        "with same boundaries and number of bins")