r.tpi use 'int' instead of np.int; add test (#974)

src/raster/r.tpi/r.tpi.py

@@ -93,7 +93,7 @@ def main():
 
     # calculate radi for generalization
     radi = np.logspace(
-        np.log(minradius), np.log(maxradius), steps, base=np.exp(1), dtype=np.int
+        np.log(minradius), np.log(maxradius), steps, base=np.exp(1), dtype="int"
     )
     radi = np.unique(radi)
     sizes = radi * 2 + 1

src/raster/r.tpi/testsuite/test_tpi.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+"""
+MODULE:    Test of r.tpi
+
+AUTHOR(S): Steven Pawley <dr.stevenpawley gmail com>
+
+PURPOSE:   Test of r.tpi basic operation
+
+COPYRIGHT: (C) 2022 by Steven Pawley and the GRASS Development Team
+
+This program is free software under the GNU General Public
+License (>=v2). Read the file COPYING that comes with GRASS
+for details.
+"""
+import grass.script as gs
+
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+
+
+class TestClassification(TestCase):
+    """Test basic operation of r.tpi"""
+
+    # input rasters
+    dem_map = "elevation"
+    tpi_map = "mtpi"
+
+    @classmethod
+    def setUpClass(cls):
+        """Setup that is required for all tests"""
+        cls.use_temp_region()
+        cls.runModule("g.region", raster=cls.dem_map)
+
+    @classmethod
+    def tearDownClass(cls):
+        """Remove the temporary region (and anything else we created)"""
+        cls.del_temp_region()
+        cls.runModule("g.remove", flags="f", type="raster", name=cls.tpi_map)
+
+    def test_mtpi(self):
+        """Checks that the output is created"""
+        # train model
+        self.assertModule(
+            "r.tpi",
+            input=self.dem_map,
+            minradius=1,
+            maxradius=31,
+            steps=5,
+            output=self.tpi_map,
+        )
+        self.assertRasterExists(self.tpi_map, msg="Output was not created")
+
+
+if __name__ == "__main__":
+    test()