r.fillnulls: added test, thanks to Sanjeet Bhatti

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@74245 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.fillnulls/testsuite/test_r_fillnulls.py

@@ -0,0 +1,48 @@
+"""
+Created on Sun Jun 07 21:57:07 2018
+
+@author: Sanjeet Bhatti
+"""
+
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+from grass.gunittest.gmodules import SimpleModule
+from grass.script.core import run_command
+
+
+class TestRFillNulls(TestCase):
+    """Test r.fillnulls script"""
+
+    mapName = 'elev_srtm_30m'
+    expression = 'elev_srtm_30m_filt = if(elev_srtm_30m < 50.0, \
+    null(), elev_srtm_30m)'
+    mapNameCalc = 'elev_srtm_30m_filt'
+    mapComplete = 'elev_srtm_30m_complete'
+    values = 'null_cells=0'
+
+    @classmethod
+    def setUpClass(cls):
+        """Create maps in a small region."""
+        cls.use_temp_region()
+        cls.runModule('g.region', raster=cls.mapName, flags='p')
+
+    @classmethod
+    def tearDownClass(cls):
+        """Remove temporary region"""
+        cls.runModule('g.remove', flags='f', type='raster',
+                      name=(cls.mapNameCalc, cls.mapComplete))
+        cls.del_temp_region()
+
+    def test_fill_nulls(self):
+        """Fill nulls test"""
+        run_command('r.mapcalc', expression=self.expression)
+
+        module = SimpleModule('r.fillnulls', input=self.mapNameCalc,
+                              output=self.mapComplete, tension=20)
+        self.assertModule(module)
+
+        self.assertRasterFitsUnivar(raster=self.mapComplete,
+                                    reference=self.values)
+
+if __name__ == '__main__':
+    test()