r.stats.quantile: minimalistic testsuite added (#2325)

* r.stats.quantile: minimalistic testsuite added, triggers #2259

Co-authored-by: Anna Petrasova <kratochanna@gmail.com>

raster/r.stats.quantile/testsuite/test_r_stats_quantile.py

@@ -0,0 +1,73 @@
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+from grass.gunittest.gmodules import call_module
+from grass.gunittest.gmodules import SimpleModule
+
+reference_str = """\
+27511:0:33.333333:134.717331
+27511:1:66.666667:143.985499
+27513:0:33.333333:140.669418
+27513:1:66.666667:146.279022
+27518:0:33.333333:115.140050
+27518:1:66.666667:129.893631
+27529:0:33.333333:96.325943
+27529:1:66.666667:103.571231
+27539:0:33.333333:123.216911
+27539:1:66.666667:133.431442
+27601:0:33.333333:89.850876
+27601:1:66.666667:98.379255
+27603:0:33.333333:91.602473
+27603:1:66.666667:103.511017
+27604:0:33.333333:75.695976
+27604:1:66.666667:87.048233
+27605:0:33.333333:102.274857
+27605:1:66.666667:112.512177
+27606:0:33.333333:108.092461
+27606:1:66.666667:124.441594
+27607:0:33.333333:124.740369
+27607:1:66.666667:135.907516
+27608:0:33.333333:91.426587
+27608:1:66.666667:104.532201
+27610:0:33.333333:81.664024
+27610:1:66.666667:92.704079
+"""
+
+
+class TestStatsQuantile(TestCase):
+
+    base = "zipcodes"
+    cover = "elevation"
+
+    def setUp(self):
+        self.use_temp_region()
+        call_module("g.region", raster="elevation")
+
+    def tearDown(self):
+        self.del_temp_region()
+        call_module(
+            "g.remove",
+            flags="f",
+            type_="raster",
+            name=[self.base, self.cover],
+        )
+
+    def test_quantiles(self):
+        self.assertModule(
+            "r.stats.quantile",
+            base=self.base,
+            cover=self.cover,
+            quantiles=3,
+            flags="p",
+        )
+
+    def test_flagp(self):
+        """Testing flag p with map zipcodes and elevation"""
+        module = SimpleModule(
+            "r.stats.quantile", base=self.base, cover=self.cover, quantiles=3, flags="p"
+        )
+        module.run()
+        self.assertLooksLike(actual=str(module.outputs.stdout), reference=reference_str)
+
+
+if __name__ == "__main__":
+    test()