Add some basic clusterObj tests (#5927)

* Add some basic clusterObj tests

* Lint fix

Author: geographika

mapscript/python/tests/cases/cluster_test.py

@@ -0,0 +1,60 @@
+# Project:  MapServer
+# Purpose:  xUnit style Python mapscript tests of clusterObj
+# Author:   Seth Girvin
+#
+# ===========================================================================
+# Copyright (c) 2019, Seth Girvin
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+# ===========================================================================
+
+import unittest
+import mapscript
+
+
+class ClusterObjTestCase(unittest.TestCase):
+
+    def testClusterObjUpdateFromString(self):
+        """a cluster can be updated from a string"""
+        c = mapscript.clusterObj()
+        c.updateFromString("CLUSTER \n MAXDISTANCE 5 \n REGION \n 'rectangle' END")
+
+        assert c.maxdistance == 5
+        assert c.region == 'rectangle'
+
+        s = c.convertToString()
+        assert s == 'CLUSTER\n  MAXDISTANCE 5\n  REGION "rectangle"\nEND # CLUSTER\n'
+
+    def testClusterObjGetSetFilter(self):
+        """a cluster filter can be set and read"""
+        c = mapscript.clusterObj()
+        filter = '[attr1] > 5'
+        c.setFilter(filter)
+        assert '"{}"'.format(filter) == c.getFilterString()
+
+    def testClusterObjGetSetGroup(self):
+        """a cluster filter can be set and read"""
+        c = mapscript.clusterObj()
+        exp = '100'  # TODO not sure what would be a relevant expression here
+        c.setGroup(exp)
+        assert '"{}"'.format(exp) == c.getGroupString()
+
+
+if __name__ == '__main__':
+    unittest.main()