How to use the eccodes.GribFile function in eccodes

def test_metadata(self):
        """Metadata is read correctly from GribMessage."""
        with GribFile(TESTGRIB) as grib_file:
            msg = GribMessage(grib_file)
            msg_keys = list(msg.keys())
            for key in KNOWN_GRIB_KEYS:
                assert key in msg_keys, "key '%s' not found" % key
            # Size of message in bytes
            self.assertEqual(msg.size(), 160219)
            self.assertEqual(len(list(msg.keys())), len(msg))

def test_clone(self):
        """Messages can be used to produce clone Messages."""
        with GribFile(TESTGRIB) as grib_file:
            msg = GribMessage(grib_file)
            msg2 = GribMessage(clone=msg)
            self.assertSequenceEqual(list(msg.keys()), list(msg2.keys()))

def test_multi_value_setting(self):
        """Multiple keys/values can be set properly."""
        msg = GribMessage(sample='GRIB1')
        msg['paramId', 'stepType', 'edition'] = 49, 'avg', 2
        self.assertEqual(msg['shortName'], '10fg')
        # Another test
        with GribFile(TESTGRIB) as grib_file:
            msg = GribMessage(grib_file)
            msg['setLocalDefinition', 'localDefinitionNumber'] = 1, 25
            msg['typeOfFirstFixedSurface', 'typeOfSecondFixedSurface'] = 1, 8
            msg[('typeOfFirstFixedSurface', 'typeOfSecondFixedSurface')] = (1, 8)  # Also works
            self.assertEqual(msg['localDefinitionNumber'], 25)
            self.assertEqual(msg['typeOfLevel'], 'entireAtmosphere')

def test_message_counting_works(self):
        """The GribFile is aware of its messages."""
        with GribFile(TESTGRIB) as grib_file:
            msg_count = len(grib_file)
        self.assertEqual(msg_count, 5)

def test_clone(self):
        """Messages can be used to produce clone Messages."""
        with GribFile(TESTGRIB) as grib_file:
            msg = GribMessage(grib_file)
            msg2 = GribMessage(clone=msg)
            self.assertSequenceEqual(msg.keys(), msg2.keys())

def test_memory_management(self):
        """Messages in GribFile can be opened and closed properly."""
        with GribFile(TESTGRIB) as grib_file:
            self.assertEqual(len(grib_file), 5)
            for i in range(len(grib_file)):
                msg = GribMessage(grib_file)
                self.assertEqual(msg["shortName"], "msl")
                self.assertEqual(msg['count'], i + 1)
            self.assertEqual(len(grib_file.open_messages), 5)
        self.assertEqual(len(grib_file.open_messages), 0)

def test_memory_management(self):
        """Messages in GribFile can be opened and closed properly."""
        with GribFile(TESTGRIB) as grib_file:
            self.assertEqual(len(grib_file), 5)
            for i in range(len(grib_file)):
                msg = GribMessage(grib_file)
                self.assertEqual(msg["shortName"], "msl")
                self.assertEqual(msg['count'], i+1)
            self.assertEqual(len(grib_file.open_messages), 5)
        self.assertEqual(len(grib_file.open_messages), 0)

def test_iterator_protocol(self):
        """The GribFile allows pythonic iteration over all messages."""
        step_ranges = []
        with GribFile(TESTGRIB) as grib_file:
            for msg in grib_file:
                step_ranges.append(msg["stepRange"])
        self.assertSequenceEqual(step_ranges, ["0", "6", "12", "18", "24"])

def test_read_past_last_message(self):
        """Trying to open message on exhausted GRIB file raises IOError."""
        with GribFile(TESTGRIB) as grib_file:
            for _ in range(len(grib_file)):
                GribMessage(grib_file)
            self.assertRaises(IOError, lambda: GribMessage(grib_file))

def test_iterator_protocol(self):
        """The GribFile allows pythonic iteration over all messages."""
        step_ranges = []
        with GribFile(TESTGRIB) as grib_file:
            for msg in grib_file:
                step_ranges.append(msg["stepRange"])
        self.assertSequenceEqual(step_ranges, ["0", "6", "12", "18", "24"])