def json_serialization_formatfree_test(self):
        """Test the json serialialization without predefined format."""
        tsOrg = TimeSeries()
        tsOrg.add_entry(0.0, 0.0)
        tsOrg.add_entry(0.1, 0.1)
        tsOrg.add_entry(0.2, 0.2)
        tsOrg.add_entry(0.3, 0.3)
        tsOrg.add_entry(0.4, 0.4)
        json = tsOrg.to_json()

        tsNew = TimeSeries.from_json(json)

        if not (len(tsOrg) == len(tsNew)): raise AssertionError
        if not (tsOrg == tsNew):           raise AssertionError
    def json_serialization_format_test(self):
        """Test the json serialialization with predefined format."""
        tsOrg = TimeSeries()
        tsOrg.add_entry(0.0, 0.0)
        tsOrg.add_entry(1.0, 0.1)
        tsOrg.add_entry(2.0, 0.2)
        tsOrg.add_entry(3.0, 0.3)
        tsOrg.add_entry(4.0, 0.4)
        tsOrg.set_timeformat("%Y-%m-%d_%H:%M:%S")
        json = tsOrg.to_json()

        tsNew = TimeSeries.from_json(json, format="%Y-%m-%d_%H:%M:%S")

        if not (len(tsOrg) == len(tsNew)): raise AssertionError
        if not (tsOrg == tsNew):          raise AssertionError