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/blockchain/sensor.py

@@ -0,0 +1,92 @@
+"""
+Support for Blockchain.info sensors.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.blockchain/
+"""
+import logging
+from datetime import timedelta
+
+import voluptuous as vol
+
+import homeassistant.helpers.config_validation as cv
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import (CONF_NAME, ATTR_ATTRIBUTION)
+from homeassistant.helpers.entity import Entity
+
+REQUIREMENTS = ['python-blockchain-api==0.0.2']
+
+_LOGGER = logging.getLogger(__name__)
+
+ATTRIBUTION = "Data provided by blockchain.info"
+
+CONF_ADDRESSES = 'addresses'
+
+DEFAULT_NAME = 'Bitcoin Balance'
+
+ICON = 'mdi:currency-btc'
+
+SCAN_INTERVAL = timedelta(minutes=5)
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_ADDRESSES): [cv.string],
+    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+})
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the Blockchain.info sensors."""
+    from pyblockchain import validate_address
+
+    addresses = config.get(CONF_ADDRESSES)
+    name = config.get(CONF_NAME)
+
+    for address in addresses:
+        if not validate_address(address):
+            _LOGGER.error("Bitcoin address is not valid: %s", address)
+            return False
+
+    add_entities([BlockchainSensor(name, addresses)], True)
+
+
+class BlockchainSensor(Entity):
+    """Representation of a Blockchain.info sensor."""
+
+    def __init__(self, name, addresses):
+        """Initialize the sensor."""
+        self._name = name
+        self.addresses = addresses
+        self._state = None
+        self._unit_of_measurement = 'BTC'
+
+    @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 icon(self):
+        """Return the icon to use in the frontend, if any."""
+        return ICON
+
+    @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 pyblockchain import get_balance
+        self._state = get_balance(self.addresses)