testsuite: r.blend quoting test (#347)

* testsuite: r.blend quoting test

Added test script which implements the test suggested in PR #277

Co-authored-by: Māris Nartišs <mn@sungis.lv>

scripts/r.blend/testsuite/test_r_blend_quoting.py

@@ -0,0 +1,65 @@
+"""
+Created on Mon 17 Feb 2020 02:27:26 PM UTC
+
+@author: Markus Neteler and Māris Nartišs, upon https://github.com/OSGeo/grass/pull/277
+"""
+
+import os
+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
+from grass.gunittest.utils import silent_rmtree
+
+
+class TestRBlend(TestCase):
+    """Test r.blend script"""
+
+    map1 = 'elevation'
+    map2 = 'aspect'
+    temp1 = 'elev_shade_blend.r'
+    temp2 = 'elev_shade_blend.g'
+    temp3 = 'elev_shade_blend.b'
+    mapsets_to_remove = []
+    # mapset with a name is also a valid mathematical expression
+    mapset_name = "1234-56-78"
+    gisenv = SimpleModule('g.gisenv', get='MAPSET')
+    TestCase.runModule(gisenv, expecting_stdout=True)
+    old_mapset = gisenv.outputs.stdout.strip()
+
+    @classmethod
+    def setUpClass(cls):
+        """Create maps in a small region."""
+        # create a mapset with a name is also a valid mathematical expression
+        cls.runModule("g.mapset", flags="c", mapset=cls.mapset_name)
+        cls.mapsets_to_remove.append(cls.mapset_name)
+        run_command('g.copy', raster=cls.map1 + '@PERMANENT,' + cls.map1)
+        cls.runModule('g.region', raster=cls.map1, flags='p')
+
+    @classmethod
+    def tearDownClass(cls):
+        """Remove temporary data"""
+        gisenv = SimpleModule('g.gisenv', get='GISDBASE')
+        cls.runModule(gisenv, expecting_stdout=True)
+        gisdbase = gisenv.outputs.stdout.strip()
+        gisenv = SimpleModule('g.gisenv', get='LOCATION_NAME')
+        cls.runModule(gisenv, expecting_stdout=True)
+        location = gisenv.outputs.stdout.strip()
+        cls.runModule('g.remove', flags='f', type='raster',
+                      name=(cls.temp1, cls.temp2, cls.temp3))
+        cls.runModule("g.mapset", mapset=cls.old_mapset)
+        for mapset_name in cls.mapsets_to_remove:
+            mapset_path = os.path.join(gisdbase, location, mapset_name)
+            silent_rmtree(mapset_path)
+
+    def test_blend(self):
+        """blends test with special mapset name"""
+
+        # should not lead to syntax error, unexpected INTEGER, expecting VARNAME or NAME
+        module = SimpleModule('r.blend', first=self.map2, second=self.map1 + '@' + self.mapset_name,
+                              output='elev_shade_blend')
+        self.assertModule(module)
+
+
+if __name__ == '__main__':
+    test()