def test_bad_header(self):
        """
        Ensure that bad data is skipped when it exists.
        """

        # This case tests against a header that does not match
        # 0000 0000 0000 0100 0000 0000 0000 0151
        file_path = os.path.join(RESOURCE_PATH, 'E0000001-BAD-HEADER1.DAT')
        self.stream_handle = open(file_path, 'rb')

        with self.assertRaises(SampleException):
            self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                           self.state_callback, self.pub_callback, self.exception_callback)

        self.stream_handle.close()

        # This case tests against a header that does not match global, but matches coastal
        # 0001 0000 0000 0000 0001 0001 0000 0000
        file_path = os.path.join(RESOURCE_PATH, 'E0000001-BAD-HEADER2.DAT')
        self.stream_handle = open(file_path, 'rb')

        with self.assertRaises(SampleException):
            self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                           self.state_callback, self.pub_callback, self.exception_callback)

        self.stream_handle.close()

    def test_get_many(self):
        """
        Read test data and pull out multiple data particles at one time.
        Assert that the results are those we expected.
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

        particles = self.parser.get_records(20)

        # Should end up with 20 particles
        self.assertTrue(len(particles) == 20)

        self.assert_result(self.test_particle3, particles[19])

        particles = self.parser.get_records(30)

        # Should end up with 30 particles
        self.assertTrue(len(particles) == 30)

        self.assert_result(self.test_particle4, particles[29])

        self.stream_handle.close()

    def test_simple(self):
        """
        Read test data and pull out data particles one at a time.
        Assert that the results are those we expected.
        """

        file_path = os.path.join(RESOURCE_PATH, 'small.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

        particles = self.parser.get_records(6)

        for particle in particles:
            log.info(particle.generate_dict())

        # Make sure the fifth particle has the correct values
        self.assert_result(self.test_particle1, particles[5])

        test_data = self.get_dict_from_yml('good.yml')

        for i in range(0,6):
            self.assert_result(test_data['data'][i], particles[i])

        self.stream_handle.close()

    def test_set_state(self):
        """
        Test changing to a new state after initializing the parser and 
        reading data, as if new data has been found and the state has
        changed
        """
        filepath = os.path.join(RESOURCE_PATH, "E0000001.DAT")
        self.stream_handle = open(filepath, "rb")

        # Moving the file position past the header and two records
        new_state = {StateKey.POSITION: HEADER_BYTES + (WFP_E_GLOBAL_RECOVERED_ENG_DATA_SAMPLE_BYTES * 2)}

        self.parser = DostaLnWfpParser(
            self.config, new_state, self.stream_handle, self.state_callback, self.pub_callback, self.exception_callback
        )

        particles = self.parser.get_records(4)

        # Should end up with 4 particles
        self.assertTrue(len(particles) == 4)

        self.assert_result(self.test_particle1, particles[3])

        # Moving the file position past the header and three records
        new_state = {StateKey.POSITION: HEADER_BYTES + (WFP_E_GLOBAL_RECOVERED_ENG_DATA_SAMPLE_BYTES * 3)}

        self.parser = DostaLnWfpParser(
            self.config, new_state, self.stream_handle, self.state_callback, self.pub_callback, self.exception_callback
        )

        particles = self.parser.get_records(10)

        # Should end up with 10 particles
        self.assertTrue(len(particles) == 10)

        self.assert_result(self.test_particle2, particles[9])

        self.stream_handle.close()

    def test_bad_data(self):
        """
        Ensure that bad data is skipped when it exists.
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001-BAD-DATA.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                       self.state_callback, self.pub_callback, self.exception_callback)


        with self.assertRaises(SampleException):
             self.parser.get_records(1)

        self.stream_handle.close()

    def create_large_yml(self):
        """
        Create a large yml file corresponding to an actual recovered dataset. This is not an actual test - it allows
        us to create what we need for integration testing, i.e. a yml file.
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

        # In a single read, get all particles in this file.
        result = self.parser.get_records(1000)

        self.particle_to_yml(result, 'E0000001.yml')

    def test_long_stream(self):
        """
        Test a long stream
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000002.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                       self.state_callback, self.pub_callback, self.exception_callback)

        particles = self.parser.get_records(1000)

        # Should end up with 683 particles
        self.assertTrue(len(particles) == 683)

        self.stream_handle.close()

    def test_verify_record_against_yaml(self):
        """
        Read data from a file and pull out data particles
        one at a time. Verify that the results are those we expected.
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

        # In a single read, get all particles in this file.
        result = self.parser.get_records(1000)

        self.assert_particles(result, 'E0000001.yml', RESOURCE_PATH)

        self.stream_handle.close()

    def test_mid_state_start(self):
        """
        Test starting the parser in a state in the middle of processing
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001.DAT')
        self.stream_handle = open(file_path, 'rb')

        # Moving the file position past the header and two records
        new_state = {StateKey.POSITION: HEADER_BYTES+(WFP_E_GLOBAL_RECOVERED_ENG_DATA_SAMPLE_BYTES*2)}

        self.parser = DostaLnWfpParser(self.config, new_state, self.stream_handle,
                                       self.state_callback, self.pub_callback, self.exception_callback)

        particles = self.parser.get_records(4)

        # Should end up with 4 particles
        self.assertTrue(len(particles) == 4)

        self.assert_result(self.test_particle1, particles[3])

        self.stream_handle.close()

class DostaLnWfpParserUnitTestCase(ParserUnitTestCase):
    """
    dosta_ln_wfp Parser unit test suite
    """
    def state_callback(self, state, file_ingested):
        """ Call back method to watch what comes in via the position callback """
        self.state_callback_value = state
        self.file_ingested_value = file_ingested

    def pub_callback(self, pub):
        """ Call back method to watch what comes in via the publish callback """
        self.publish_callback_value = pub

    def exception_callback(self, exception):
        """ Call back method to match what comes in via the exception callback """
        self.exception_callback_value = exception

    def setUp(self):
        ParserUnitTestCase.setUp(self)
        self.config = {
            DataSetDriverConfigKeys.PARTICLE_MODULE: 'mi.dataset.parser.dosta_ln_wfp',
            DataSetDriverConfigKeys.PARTICLE_CLASS: 'DostaLnWfpInstrumentParserDataParticle'
        }
        # Define test data particles and their associated timestamps which will be
        # compared with returned results

        self.start_state = {StateKey.POSITION: 0}

        self.file_ingested_value = None
        self.state_callback_value = None
        self.publish_callback_value = None

        self.test_particle1 = {}
        self.test_particle1['internal_timestamp'] = 3583638177
        self.test_particle1[StateKey.POSITION] = 204
        self.test_particle1[DostaLnWfpInstrumentParserDataParticleKey.ESTIMATED_OXYGEN_CONCENTRATION] = \
            154.23699951171875
        self.test_particle1[DostaLnWfpInstrumentParserDataParticleKey.OPTODE_TEMPERATURE] = 1.4819999933242798
        self.test_particle1[DostaLnWfpInstrumentParserDataParticleKey.WFP_TIMESTAMP] = 1374649377

        self.test_particle2 = {}
        self.test_particle2['internal_timestamp'] = 3583638247
        self.test_particle2[StateKey.POSITION] = 414
        self.test_particle2[DostaLnWfpInstrumentParserDataParticleKey.ESTIMATED_OXYGEN_CONCENTRATION] = \
            153.7899932861328
        self.test_particle2[DostaLnWfpInstrumentParserDataParticleKey.OPTODE_TEMPERATURE] = 1.4950000047683716
        self.test_particle2[DostaLnWfpInstrumentParserDataParticleKey.WFP_TIMESTAMP] = 1374649447

        self.test_particle3 = {}
        self.test_particle3['internal_timestamp'] = 3583638317
        self.test_particle3[StateKey.POSITION] = 624
        self.test_particle3[DostaLnWfpInstrumentParserDataParticleKey.ESTIMATED_OXYGEN_CONCENTRATION] = \
            153.41099548339844
        self.test_particle3[DostaLnWfpInstrumentParserDataParticleKey.OPTODE_TEMPERATURE] = 1.5
        self.test_particle3[DostaLnWfpInstrumentParserDataParticleKey.WFP_TIMESTAMP] = 1374649517

        self.test_particle4 = {}
        self.test_particle4['internal_timestamp'] = 3583638617
        self.test_particle4[StateKey.POSITION] = 1524
        self.test_particle4[DostaLnWfpInstrumentParserDataParticleKey.ESTIMATED_OXYGEN_CONCENTRATION] = \
            152.13600158691406
        self.test_particle4[DostaLnWfpInstrumentParserDataParticleKey.OPTODE_TEMPERATURE] = 1.5019999742507935
        self.test_particle4[DostaLnWfpInstrumentParserDataParticleKey.WFP_TIMESTAMP] = 1374649817


    def test_simple(self):
        """
        Read test data and pull out data particles one at a time.
        Assert that the results are those we expected.
        """

        file_path = os.path.join(RESOURCE_PATH, 'small.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

        particles = self.parser.get_records(6)

        # Make sure the fifth particle has the correct values
        self.assert_result(self.test_particle1, particles[5])

        test_data = self.get_dict_from_yml('good.yml')

        for i in range(0,6):
            self.assert_result(test_data['data'][i], particles[i])

        self.stream_handle.close()

    def test_get_many(self):
        """
        Read test data and pull out multiple data particles at one time.
        Assert that the results are those we expected.
        """
        file_path = os.path.join(RESOURCE_PATH, 'E0000001.DAT')
        self.stream_handle = open(file_path, 'rb')

        self.parser = DostaLnWfpParser(self.config, self.start_state, self.stream_handle,
                                     self.state_callback, self.pub_callback, self.exception_callback)

#.........这里部分代码省略.........