Updating TC_MOD_1_2 test module:

- Added check to make sure that all values for modes in SupportedModes are unique values

Author: j-ororke

src/python_testing/TC_MOD_1_2.py

@@ -68,7 +68,8 @@ async def test_TC_MOD_1_2(self):
 
         mode_options = await self.read_single_attribute(dev_ctrl=self.th1, node_id=self.dut_node_id, endpoint=self.endpoint, attribute=attributes.SupportedModes)
         modes = [option.mode for option in mode_options]
-
+        asserts.assert_equal(len(modes), len(set(modes)), "Duplicate values were found in Supported Modes modes, only expected to contain unique values for each mode")
+        
         self.step(2)
         Current_Mode_ID = await self.read_single_attribute(dev_ctrl=self.th1, node_id=self.dut_node_id, endpoint=self.endpoint, attribute=attributes.CurrentMode)
         asserts.assert_in(Current_Mode_ID, modes, "Current Mode ID should have been in supported modes")