Speed up mqtt tests (#73423)

Co-authored-by: jbouwh <jan@jbsoft.nl>
Co-authored-by: Jan Bouwhuis <jbouwh@users.noreply.github.com>

tests/components/mqtt/test_number.py

@@ -23,6 +23,7 @@ from homeassistant.const import (
     ATTR_ASSUMED_STATE,
     ATTR_ENTITY_ID,
     ATTR_UNIT_OF_MEASUREMENT,
+    Platform,
 )
 import homeassistant.core as ha
 from homeassistant.setup import async_setup_component
@@ -64,6 +65,13 @@ DEFAULT_CONFIG = {
 }
 
 
+@pytest.fixture(autouse=True)
+def number_platform_only():
+    """Only setup the number platform to speed up tests."""
+    with patch("homeassistant.components.mqtt.PLATFORMS", [Platform.NUMBER]):
+        yield
+
+
 async def test_run_number_setup(hass, mqtt_mock_entry_with_yaml_config):
     """Test that it fetches the given payload."""
     topic = "test/number"