Add reconfigure flow to Airgradient (#136324)

* Add reconfigure flow to Airgradient

* Update homeassistant/components/airgradient/strings.json

---------

Co-authored-by: Robert Resch <robert@resch.dev>

tests/components/airgradient/test_config_flow.py

@@ -296,3 +296,99 @@ async def test_user_flow_works_discovery(
 
     # Verify the discovery flow was aborted
     assert not hass.config_entries.flow.async_progress(DOMAIN)
+
+
+async def test_reconfigure_flow(
+    hass: HomeAssistant,
+    mock_new_airgradient_client: AsyncMock,
+    mock_setup_entry: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfigure flow."""
+    mock_config_entry.add_to_hass(hass)
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {CONF_HOST: "10.0.0.131"},
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.data == {
+        CONF_HOST: "10.0.0.131",
+    }
+
+
+async def test_reconfigure_flow_errors(
+    hass: HomeAssistant,
+    mock_new_airgradient_client: AsyncMock,
+    mock_setup_entry: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfigure flow."""
+    mock_config_entry.add_to_hass(hass)
+    mock_new_airgradient_client.get_current_measures.side_effect = (
+        AirGradientConnectionError()
+    )
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {CONF_HOST: "10.0.0.132"},
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {"base": "cannot_connect"}
+
+    mock_new_airgradient_client.get_current_measures.side_effect = None
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {CONF_HOST: "10.0.0.132"},
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.data == {
+        CONF_HOST: "10.0.0.132",
+    }
+
+
+async def test_reconfigure_flow_unique_id_mismatch(
+    hass: HomeAssistant,
+    mock_new_airgradient_client: AsyncMock,
+    mock_setup_entry: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfigure flow aborts with unique id mismatch."""
+    mock_config_entry.add_to_hass(hass)
+
+    mock_new_airgradient_client.get_current_measures.return_value.serial_number = (
+        "84fce612f5b9"
+    )
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {CONF_HOST: "10.0.0.132"},
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "unique_id_mismatch"
+    assert mock_config_entry.data == {
+        CONF_HOST: "10.0.0.131",
+    }