r.circle: Add tests for raster circle tool (#4598)

raster/r.circle/testsuite/test_circle.py

@@ -0,0 +1,85 @@
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+import grass.script as gs
+from grass.gunittest.gmodules import SimpleModule
+
+
+class TestRCircle(TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        """Set up a temporary region for testing."""
+        cls.output = "test_circle"
+        cls.use_temp_region()
+        cls.runModule("g.region", n=30, s=0, e=30, w=0, res=10)
+
+    @classmethod
+    def tearDownClass(cls):
+        """Clean up after tests."""
+        cls.del_temp_region()
+
+    def tearDown(self):
+        gs.run_command(
+            "g.remove",
+            type="raster",
+            name=self.output,
+            flags="f",
+        )
+
+    def test_create_circle_with_b_flag(self):
+        """Test creating a binary circle with r.circle using -b flag."""
+
+        module = SimpleModule(
+            "r.circle", output=self.output, coordinates=(15, 15), max=10, flags="b"
+        )
+
+        self.assertModule(module)
+
+        self.assertRasterExists(self.output)
+
+        self.assertRasterMinMax(
+            map=self.output,
+            refmin=1,
+            refmax=1,
+            msg="Binary circle should have category value of 1",
+        )
+
+    def test_create_circle_without_b_flag(self):
+        """Test creating a circle with r.circle without -b flag."""
+
+        module = SimpleModule(
+            "r.circle", output=self.output, coordinates=(15, 15), max=10
+        )
+
+        self.assertModule(module)
+
+        self.assertRasterExists(self.output)
+
+        self.assertRasterMinMax(
+            map=self.output,
+            refmin=0,
+            refmax=10,
+            msg="Circle should have distance values from 0 to 10",
+        )
+
+    def test_create_circle_with_multiplier(self):
+        """Test creating a circle with r.circle with a multiplier."""
+
+        module = SimpleModule(
+            "r.circle", output=self.output, coordinates=(15, 15), max=10, multiplier=2
+        )
+
+        self.assertModule(module)
+
+        self.assertRasterExists(self.output)
+
+        self.assertRasterMinMax(
+            map=self.output,
+            refmin=0,
+            refmax=20,
+            msg="Circle should have distance values from 0 to 20",
+        )
+
+
+if __name__ == "__main__":
+    test()