Update test_cf.py

related to issue # 950 [ioos#950]

Mocked a new .nc file to test the grid_mapping requirements and recommendations

compliance_checker/tests/test_cf.py

@@ -1294,15 +1294,50 @@ def test_check_reduced_horizontal_grid(self):
         assert all(r.name == "§5.3 Reduced Horizontal Grid" for r in results)
 
     def test_check_grid_mapping(self):
-        dataset = self.load_dataset(STATIC_FILES["mapping"])
-        results = self.cf.check_grid_mapping(dataset)
+#         dataset = self.load_dataset(STATIC_FILES["mapping"])
+#         results = self.cf.check_grid_mapping(dataset)
+
+#         assert len(results) == 6
+#         assert len([r.value for r in results.values() if r.value[0] < r.value[1]]) == 0
+#         expected_name = (
+#             "§5.6 Horizontal Coordinate Reference Systems, Grid Mappings, Projections"
+#         )
+#         assert all(r.name == expected_name for r in results.values())
+
+        # create Cells with grid_apping variable
+        dataset = MockTimeSeries()
+
+        dataset.createVariable("temp", "d", ("time"))
+        dataset.createVariable("crsOSGB", "d")
+        dataset.createVariable("crsWGS84", "d")
+
+        temp = dataset.variables["temp"]
+        temp.standard_name = "air_temperature"
+        temp.units = "K"
+        temp.coordinates = "lat lon"
+        temp.grid_mapping = "crsOSGB: time crsWGS84: lat lon"
+
+        # create grid_mapping crsOSGB ;
+        crsOSGB = dataset.variables["crsOSGB"]
+        crsOSGB.grid_mapping_name = "transverse_mercator"
+        crsOSGB.semi_major_axis = 6377563.396
+        crsOSGB.inverse_flattening = 299.3249646
+        crsOSGB.ongitude_of_prime_meridian = 0.0
+        crsOSGB.latitude_of_projection_origin = 49.0
+        crsOSGB.longitude_of_central_meridian = -2.0
+        crsOSGB.scale_factor_at_central_meridian = 0.9996012717
+        crsOSGB.false_easting = 400000.0
+        crsOSGB.false_northing = -100000.0
+        crsOSGB.unit = "metre"
+
+        # create grid_mapping crsWGS84
+        crsWGS84 = dataset.variables["crsWGS84"]
+        crsWGS84.grid_mapping_name = "latitude_longitude"
+        crsWGS84.longitude_of_prime_meridian = 0.0
+        crsWGS84.semi_major_axis = 6378137.0
+        crsWGS84.inverse_flattening = 298.257223563
 
-        assert len(results) == 6
-        assert len([r.value for r in results.values() if r.value[0] < r.value[1]]) == 0
-        expected_name = (
-            "§5.6 Horizontal Coordinate Reference Systems, Grid Mappings, Projections"
-        )
-        assert all(r.name == expected_name for r in results.values())
+        results = self.cf.check_grid_mapping(dataset)
 
     def test_is_geophysical(self):