Add integration platform helper (#29914)

tests/helpers/test_integration_platform.py

@@ -0,0 +1,37 @@
+"""Test integration platform helpers."""
+from unittest.mock import Mock
+
+from homeassistant.setup import ATTR_COMPONENT, EVENT_COMPONENT_LOADED
+
+from tests.common import mock_platform
+
+
+async def test_process_integration_platforms(hass):
+    """Test processing integrations."""
+    loaded_platform = Mock()
+    mock_platform(hass, "loaded.platform_to_check", loaded_platform)
+    hass.config.components.add("loaded")
+
+    event_platform = Mock()
+    mock_platform(hass, "event.platform_to_check", event_platform)
+
+    processed = []
+
+    async def _process_platform(hass, domain, platform):
+        """Process platform."""
+        processed.append((domain, platform))
+
+    await hass.helpers.integration_platform.async_process_integration_platforms(
+        "platform_to_check", _process_platform
+    )
+
+    assert len(processed) == 1
+    assert processed[0][0] == "loaded"
+    assert processed[0][1] == loaded_platform
+
+    hass.bus.async_fire(EVENT_COMPONENT_LOADED, {ATTR_COMPONENT: "event"})
+    await hass.async_block_till_done()
+
+    assert len(processed) == 2
+    assert processed[1][0] == "event"
+    assert processed[1][1] == event_platform