Implemented unit tests for bug 162.

Author: hcpchris

tests/input_files/series/base/bugfix162.csv

@@ -0,0 +1,5 @@
+task_id,name,start,end,parent,dependency
+1,DoThing1,2023-01-01,2023-02-01,,
+2,DoThing1-sub1,2023-01-11,2023-01-14,1,
+3,DoThing1-sub2,2023-01-01,2023-02-01,1,2
+4,DoThing2,2023-02-02,2023-03-01,,

tests/options/series/test_base.py

@@ -923,4 +923,27 @@ def test_convert_to(input_files, filename, target_type, as_cls, error):
         converted = original.convert_to(target_type)
         assert converted is not None
         assert isinstance(converted, SeriesBase)
-        assert isinstance(converted, target_type_cls)
+        assert isinstance(converted, target_type_cls)
+
+
+def test_bugfix162(input_files):
+    from highcharts_core.chart import Chart
+    from highcharts_core.options import HighchartsOptions
+    from highcharts_core.options.series.area import LineSeries
+
+    import pandas as pd
+    from collections import defaultdict
+    
+    filename = 'series/base/bugfix162.csv'
+    input_file = check_input_file(input_files, filename)
+
+    dtype = defaultdict(lambda: "str")
+
+    df = pd.read_csv(input_file, dtype=dtype, parse_dates=["start", "end"])
+    
+    # Creating a Series from the DataFrame
+    my_series = LineSeries.from_pandas(
+        df, property_map={"id": "task_id", "name": "name", "start": "start", "end": "end"}
+    )
+    
+    assert my_series is not None