Fix minor issues with unittest

Author: phumthep

src/pownet/optim_model/constraints/thermal_unit_constr.py

@@ -1,4 +1,4 @@
-"""thermal_unit.py: Constraints for thermal units"""
+"""thermal_unit_constr.py: Constraints for thermal units"""
 
 import gurobipy as gp
 import pandas as pd

src/test_pownet/test_optim_model/test_constraints/__init__.py

@@ -3,11 +3,10 @@
 import unittest
 import gurobipy as gp
 
-# Import the module to be tested
 from pownet.optim_model.constraints import thermal_unit_constr
 
 
-class TestThermalUnitConstraints(unittest.TestCase):
+class TestThermalUnitConstrs(unittest.TestCase):
 
     def setUp(self):
         """Set up common resources for each test method."""