Geografic-Information-System/scripts/r.grow/testsuite/test_r_grow.py

"""
Created on Sun Jun 07 22:09:41 2018

@author: Sanjeet Bhatti, Maris Nartiss
"""

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 TestRGrow(TestCase):
    """Test r.grow script"""

    mapName = "lakes"
    mapGrownOutput = "lakes_grown_100m"
    mapShrunkOutput = "lakes_shrunk_100m"
    mapNoNULL = "elevation"
    mapShrunkNoNULL = "elevation_shrunk"

    @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.mapGrownOutput, cls.mapShrunkOutput, cls.mapShrunkNoNULL),
        )
        cls.del_temp_region()

    def test_grow(self):
        """Grow test"""
        module = SimpleModule(
            "r.grow", input=self.mapName, output=self.mapGrownOutput, radius=10
        )
        self.assertModule(module)

    def test_shrink(self):
        """Shrink test"""
        module = SimpleModule(
            "r.grow", input=self.mapName, output=self.mapShrunkOutput, radius=-10
        )
        self.assertModule(module)

    def test_shrink_null(self):
        """Shrinking of map without NULL values
        Based on https://github.com/OSGeo/grass/pull/343"""
        shrinked_string = "56-156"
        shrinked = SimpleModule(
            "r.grow", input=self.mapNoNULL, output=self.mapShrunkNoNULL, radius=-10
        )
        self.assertModule(shrinked)

        shrined_range = SimpleModule("r.describe", flags="i", _map=self.mapShrunkNoNULL)
        self.runModule(shrined_range)
        self.assertLooksLike(shrinked_string, str(shrined_range.outputs.stdout).strip())


if __name__ == "__main__":
    test()