fix(epw): fixed bug in sky_temperature method

We have forgotten to change .values to .data after making the change in DataCollection class.

Added an extra test to catch this issue in the future.

ladybug/epw.py

@@ -734,7 +734,7 @@ def sky_temperature(self):
 
  # calculate sy temperature for each hour
  sky_temp_data = []
- for hor_ir in horiz_ir.values:
+ for hor_ir in horiz_ir.data:
  dat = hor_ir.datetime
  temp = ((float(hor_ir) / (5.6697 * (10**(-8))))**(0.25)) - 273.15
  sky_temp_data.append(DataPoint(temp, dat))

tests/epw_test.py

@@ -31,6 +31,7 @@ def test_import_epw(self):
  # Check that calling location getter only retrieves location
  assert epw.is_data_loaded is False
  dbt = epw.dry_bulb_temperature
+ skyt = epw.sky_temperature # test sky temperature calculation
  assert epw.is_data_loaded is True
  assert len(dbt) == 8760