Add testing for time.

IO/NetCDF/Testing/Python/NetCDFCFSphericalCoords.py

 #!/usr/bin/env python
 from GetReader import get_reader
+from vtkmodules.vtkCommonExecutionModel import vtkStreamingDemandDrivenPipeline
 from vtkmodules.vtkFiltersCore import (
     vtkAssignAttribute,
     vtkThreshold,
@@ -23,7 +24,12 @@ VTK_DATA_ROOT = vtkGetDataRoot()
 # Open the file.
 reader = get_reader(VTK_DATA_ROOT + "/Data/tos_O1_2001-2002.nc")
 # Set the arrays we want to load.
-reader.UpdateMetaData()
+reader.UpdateInformation()
+info = reader.GetOutputInformation(0)
+assert info.Has(vtkStreamingDemandDrivenPipeline.TIME_STEPS()), "Time dependent dataset does not have TIME_STEPS key"
+# the exact times are not the same between NetCDFCF and XArray accessors, because XArray uses
+times = info.Get(vtkStreamingDemandDrivenPipeline.TIME_STEPS())
+assert len(times) == 24 and (times[23]) - times[0] == (705.0 - 15.0), "Number of time steps or time values are wrong."
 reader.SetVariableArrayStatus("tos",1)
 reader.SetSphericalCoordinates(1)
 aa = vtkAssignAttribute()