Discover new bluetooth adapters when they are plugged in (#77006)

tests/components/bluetooth/test_init.py

@@ -1641,3 +1641,59 @@ async def test_migrate_single_entry_linux(hass, mock_bleak_scanner_start, one_ad
     assert await async_setup_component(hass, bluetooth.DOMAIN, {})
     await hass.async_block_till_done()
     assert entry.unique_id == "00:00:00:00:00:01"
+
+
+async def test_discover_new_usb_adapters(hass, mock_bleak_scanner_start, one_adapter):
+    """Test we can discover new usb adapters."""
+    entry = MockConfigEntry(
+        domain=bluetooth.DOMAIN, data={}, unique_id="00:00:00:00:00:01"
+    )
+    entry.add_to_hass(hass)
+
+    saved_callback = None
+
+    def _async_register_scan_request_callback(_hass, _callback):
+        nonlocal saved_callback
+        saved_callback = _callback
+        return lambda: None
+
+    with patch(
+        "homeassistant.components.bluetooth.usb.async_register_scan_request_callback",
+        _async_register_scan_request_callback,
+    ):
+        assert await async_setup_component(hass, bluetooth.DOMAIN, {})
+        await hass.async_block_till_done()
+
+    assert not hass.config_entries.flow.async_progress(DOMAIN)
+
+    saved_callback()
+    assert not hass.config_entries.flow.async_progress(DOMAIN)
+
+    with patch(
+        "homeassistant.components.bluetooth.util.platform.system", return_value="Linux"
+    ), patch(
+        "bluetooth_adapters.get_bluetooth_adapter_details",
+        return_value={
+            "hci0": {
+                "org.bluez.Adapter1": {
+                    "Address": "00:00:00:00:00:01",
+                    "Name": "BlueZ 4.63",
+                    "Modalias": "usbid:1234",
+                }
+            },
+            "hci1": {
+                "org.bluez.Adapter1": {
+                    "Address": "00:00:00:00:00:02",
+                    "Name": "BlueZ 4.63",
+                    "Modalias": "usbid:1234",
+                }
+            },
+        },
+    ):
+        for wait_sec in range(10, 20):
+            async_fire_time_changed(
+                hass, dt_util.utcnow() + timedelta(seconds=wait_sec)
+            )
+            await hass.async_block_till_done()
+
+    assert len(hass.config_entries.flow.async_progress(DOMAIN)) == 1