Consolidate all platforms that have no tests (#22096)

* Consolidate

* Fix tests

* Update imports

* Fix import

* Use importlib because integration and package share name

* Fix more tests

* Update .coveragerc and CODEOWNERS

homeassistant/components/etherscan/sensor.py

@@ -0,0 +1,85 @@
+"""Support for Etherscan sensors."""
+from datetime import timedelta
+
+import voluptuous as vol
+
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import (
+    ATTR_ATTRIBUTION, CONF_ADDRESS, CONF_NAME, CONF_TOKEN)
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import Entity
+
+REQUIREMENTS = ['python-etherscan-api==0.0.3']
+
+ATTRIBUTION = "Data provided by etherscan.io"
+
+CONF_TOKEN_ADDRESS = 'token_address'
+
+SCAN_INTERVAL = timedelta(minutes=5)
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_ADDRESS): cv.string,
+    vol.Optional(CONF_NAME): cv.string,
+    vol.Optional(CONF_TOKEN): cv.string,
+    vol.Optional(CONF_TOKEN_ADDRESS): cv.string,
+})
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the Etherscan.io sensors."""
+    address = config.get(CONF_ADDRESS)
+    name = config.get(CONF_NAME)
+    token = config.get(CONF_TOKEN)
+    token_address = config.get(CONF_TOKEN_ADDRESS)
+
+    if token:
+        token = token.upper()
+        if not name:
+            name = "%s Balance" % token
+    if not name:
+        name = "ETH Balance"
+
+    add_entities([EtherscanSensor(name, address, token, token_address)], True)
+
+
+class EtherscanSensor(Entity):
+    """Representation of an Etherscan.io sensor."""
+
+    def __init__(self, name, address, token, token_address):
+        """Initialize the sensor."""
+        self._name = name
+        self._address = address
+        self._token_address = token_address
+        self._token = token
+        self._state = None
+        self._unit_of_measurement = self._token or "ETH"
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement this sensor expresses itself in."""
+        return self._unit_of_measurement
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes of the sensor."""
+        return {ATTR_ATTRIBUTION: ATTRIBUTION}
+
+    def update(self):
+        """Get the latest state of the sensor."""
+        from pyetherscan import get_balance
+        if self._token_address:
+            self._state = get_balance(self._address, self._token_address)
+        elif self._token:
+            self._state = get_balance(self._address, self._token)
+        else:
+            self._state = get_balance(self._address)