text: import sys
  import fake_rpi
  
  sys.modules['RPi'] = fake_rpi.RPi     # Fake RPi
  sys.modules['RPi.GPIO'] = fake_rpi.RPi.GPIO # Fake GPIO
  sys.modules['smbus'] = fake_rpi.smbus # Fake smbus (I2C)
  
  import unittest
  import os
  import avista_sensors.processor_loader as pl
  from avista_sensors.impl.random_processor import RandomProcessor
  import json
  
  
  class ProcessorLoaderTest(unittest.TestCase):
  
      def test_dynamic_import(self):
          module = "avista_sensors.impl.random_processor"
          klass = "RandomProcessor"
          result = pl.dynamic_import(module, klass)
          self.assertTrue(isinstance(result, RandomProcessor), "not expected type")
  
      def test_dynamic_import_none_module(self):
          module = None
          klass = "RandomProcessor"
          result = pl.dynamic_import(module, klass)
          self.assertIsNone(result, "not none")
  
      def test_dynamic_import_empty_module(self):
          module = ""
          klass = "RandomProcessor"
          result = pl.dynamic_import(module, klass)
          self.assertIsNone(result, "not none")
  
      def test_dynamic_import_none_class(self):
          module = "avista_sensors.impl.random_processor"
          klass = None
          result = pl.dynamic_import(module, klass)
          self.assertIsNone(result, "not none")
  
      def test_dynamic_import_empty_class(self):
          module = "avista_sensors.impl.random_processor"
          klass = None
          result = pl.dynamic_import(module, klass)
          self.assertIsNone(result, "not none")
  
      def test_load_from_config(self):
          os.chdir("..")
          os.chdir("config")
          path = os.getcwd()
          sensors = pl.load_from_config(path)
          self.assertEqual(2, len(sensors), "not same length")
  
      def test_load_from_json(self):
          dct = {
              'module': 'avista_sensors.impl.random_processor',
              'cls': 'RandomProcessor',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_from_json(json.dumps(dct))
          self.assertTrue(isinstance(result, RandomProcessor), "not expected type")
  
      def test_load_from_json_none(self):
          data = None
          result = pl.load_from_json(data)
          self.assertIsNone(result)
  
      def test_import_from(self):
          module = 'avista_sensors.impl.random_processor.RandomProcessor'
          result = pl.import_from(module)
          self.assertTrue(isinstance(result, RandomProcessor.__class__), "not expected type")
  
      def test_import_from_none(self):
          module = None
          with self.assertRaises(Exception):
              pl.import_from(module)
  
      def test_import_from_empty(self):
          module = ''
          with self.assertRaises(Exception):
              pl.import_from(module)
  
      def test_load_sensor_from_dict(self):
          dct = {
              'module': 'avista_sensors.impl.random_processor',
              'cls': 'RandomProcessor',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_sensor_from_dict(dct)
          self.assertTrue(isinstance(result, RandomProcessor), "not expected type")
          self.assertEqual("Test", result.get_name())
          self.assertTrue(result.has_parameter("x", 1))
          self.assertTrue(result.has_parameter("y", 2))
  
      def test_load_sensor_from_dict_no_module(self):
          dct = {
              'cls': 'RandomProcessor',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_sensor_from_dict(dct)
          self.assertIsNone(result)
  
      def test_load_sensor_from_dict_empty_module(self):
          dct = {
              'module': '',
              'cls': 'RandomProcessor',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_sensor_from_dict(dct)
          self.assertIsNone(result)
  
      def test_load_sensor_from_dict_empty_cls(self):
          dct = {
              'module': 'avista_sensors.impl.random_processor',
              'cls': '',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_sensor_from_dict(dct)
          self.assertIsNone(result)
  
      def test_load_sensor_from_dict_no_cls(self):
          dct = {
              'module': 'avista_sensors.impl.random_processor',
              'name': 'Test',
              'parameters': [
                  {'key': 'x', 'value': 1},
                  {'key': 'y', 'value': 2}
              ]
          }
          result = pl.load_sensor_from_dict(dct)
          self.assertIsNone(result)
  
  
  if __name__ == '__main__':
      unittest.main()
  