Follow main package structure for tests (#1317)

* Transport tests under tests/transports/
* Protocol tests under tests/protocols/
* IOT tests under iot/
* Plus some minor cleanups, most code changes are related to splitting
up smart & iot tests

tests/smart/modules/test_energy.py

@@ -0,0 +1,21 @@
+import pytest
+
+from kasa import Module, SmartDevice
+from kasa.interfaces.energy import Energy
+from kasa.smart.modules import Energy as SmartEnergyModule
+from tests.conftest import has_emeter_smart
+
+
+@has_emeter_smart
+async def test_supported(dev: SmartDevice):
+    energy_module = dev.modules.get(Module.Energy)
+    if not energy_module:
+        pytest.skip(f"Energy module not supported for {dev}.")
+
+    assert isinstance(energy_module, SmartEnergyModule)
+    assert energy_module.supports(Energy.ModuleFeature.CONSUMPTION_TOTAL) is False
+    assert energy_module.supports(Energy.ModuleFeature.PERIODIC_STATS) is False
+    if energy_module.supported_version < 2:
+        assert energy_module.supports(Energy.ModuleFeature.VOLTAGE_CURRENT) is False
+    else:
+        assert energy_module.supports(Energy.ModuleFeature.VOLTAGE_CURRENT) is True