Add test for new functionality for powder polaris

This commit adds system tests for the new fourier filter in powder polaris.

re: 27773

Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py

@@ -229,13 +229,32 @@ class TotalScatteringPdfTypeTest(systemtesting.MantidSystemTest):
         self.assertAlmostEqual(self.pdf_output.dataY(0)[37], 1.0152123, places=3)
 
 
-def run_total_scattering(run_number, merge_banks, q_lims=None, output_binning=None, pdf_type="G(r)"):
+class TotalScatteringFilterTest(systemtesting.MantidSystemTest):
+
+    pdf_output = None
+
+    def runTest(self):
+        setup_mantid_paths()
+        # Load Focused ws
+        mantid.LoadNexus(Filename=total_scattering_input_file, OutputWorkspace='98533-Results-TOF-Grp')
+        q_lims = np.array([2.5, 3, 4, 6, 7, 3.5, 5, 7, 11, 40]).reshape((2, 5))
+        self.pdf_output = run_total_scattering('98533', True, q_lims=q_lims, freq_params=[1])
+
+    def validate(self):
+        # Whilst total scattering is in development, the validation will avoid using reference files as they will have
+        # to be updated very frequently. In the meantime, the expected peak in the PDF at ~3.9 Angstrom will be checked.
+        # After rebin this is at X index 37
+        self.assertAlmostEqual(self.pdf_output.dataY(0)[37], 0.6068334, places=3)
+
+
+def run_total_scattering(run_number, merge_banks, q_lims=None, output_binning=None, pdf_type="G(r)", freq_params=None):
     pdf_inst_obj = setup_inst_object(mode="PDF")
     return pdf_inst_obj.create_total_scattering_pdf(run_number=run_number,
                                                     merge_banks=merge_banks,
                                                     q_lims=q_lims,
                                                     output_binning=output_binning,
-                                                    pdf_type=pdf_type)
+                                                    pdf_type=pdf_type,
+                                                    freq_params=freq_params)
 
 
 def _gen_required_files():

scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py

@@ -7,7 +7,6 @@
 from __future__ import (absolute_import, division, print_function)
 import numpy as np
 
-from mantid import AnalysisDataService as ADS
 import mantid.simpleapi as mantid
 from six import string_types