Refactor FakeNetCDF4FileHandler2.get_test_content for viirs_l1b tests

satpy/tests/reader_tests/test_viirs_l1b.py

@@ -72,6 +72,16 @@ def get_test_content(self, filename, filename_info, filetype_info):
             '/attr/instrument': 'viirs',
             '/attr/platform': 'Suomi-NPP',
         }
+        self._fill_contents_with_default_data(file_content, file_type)
+
+        self._set_dataset_specific_metadata(file_content)
+
+        convert_file_content_to_data_array(file_content)
+        return file_content
+
+    @staticmethod
+    def _fill_contents_with_default_data(file_content, file_type):
+        """Fill file contents with default data."""
         if file_type.startswith('vgeo'):
             file_content['/attr/OrbitNumber'] = file_content.pop('/attr/orbit_number')
             file_content['geolocation_data/latitude'] = DEFAULT_LAT_DATA
@@ -110,6 +120,9 @@ def get_test_content(self, filename, filename_info, filetype_info):
             file_content['observation_data/DNB_observations'] = DEFAULT_FILE_DATA
             file_content['observation_data/DNB_observations/attr/units'] = 'Watts/cm^2/steradian'
 
+    @staticmethod
+    def _set_dataset_specific_metadata(file_content):
+        """Set dataset-specific metadata."""
         for k in list(file_content.keys()):
             if not k.startswith('observation_data') and not k.startswith('geolocation_data'):
                 continue
@@ -138,9 +151,6 @@ def get_test_content(self, filename, filename_info, filetype_info):
             file_content[k + '/attr/scale_factor'] = 1.1
             file_content[k + '/attr/add_offset'] = 0.1
 
-        convert_file_content_to_data_array(file_content)
-        return file_content
-
 
 class TestVIIRSL1BReader(unittest.TestCase):
     """Test VIIRS L1B Reader."""