Add new number entity integration (#42735)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

tests/components/number/test_init.py

@@ -0,0 +1,39 @@
+"""The tests for the Number component."""
+from unittest.mock import MagicMock
+
+from homeassistant.components.number import NumberEntity
+
+
+class MockNumberEntity(NumberEntity):
+    """Mock NumberEntity device to use in tests."""
+
+    @property
+    def max_value(self) -> float:
+        """Return the max value."""
+        return 1.0
+
+    @property
+    def state(self):
+        """Return the current value."""
+        return "0.5"
+
+
+async def test_step(hass):
+    """Test the step calculation."""
+    number = NumberEntity()
+    assert number.step == 1.0
+
+    number_2 = MockNumberEntity()
+    assert number_2.step == 0.1
+
+
+async def test_sync_set_value(hass):
+    """Test if async set_value calls sync set_value."""
+    number = NumberEntity()
+    number.hass = hass
+
+    number.set_value = MagicMock()
+    await number.async_set_value(42)
+
+    assert number.set_value.called
+    assert number.set_value.call_args[0][0] == 42