[it8951] Hold display enable pins off during deep-sleep (#20471)

tests/component_tests/it8951/test_init.py

@@ -0,0 +1,28 @@
+"""Tests for it8951 configuration validation."""
+
+from collections.abc import Callable
+from typing import Any
+
+from esphome.components.const import CONF_HOLD_STATE
+from esphome.components.esp32 import KEY_BOARD, KEY_VARIANT, VARIANT_ESP32S3
+from esphome.components.it8951.display import CONFIG_SCHEMA
+from esphome.const import CONF_ENABLE_PIN, CONF_NUMBER, PlatformFramework
+from tests.component_tests.types import SetCoreConfigCallable
+
+
+def test_reterminal_e1003_enable_pins_hold_state(
+    set_core_config: SetCoreConfigCallable,
+    set_component_config: Callable[[str, Any], None],
+) -> None:
+    """The reTerminal E1003 enable pins must hold their state during deep sleep."""
+    set_core_config(
+        PlatformFramework.ESP32_IDF,
+        platform_data={KEY_BOARD: "esp32-s3-devkitc-1", KEY_VARIANT: VARIANT_ESP32S3},
+    )
+    set_component_config("spi", {"id": "spi_bus", "clk_pin": 7, "mosi_pin": 9})
+
+    config = CONFIG_SCHEMA({"id": "test_display", "model": "seeed-reterminal-e1003"})
+
+    enable_pins = config[CONF_ENABLE_PIN]
+    assert [pin[CONF_NUMBER] for pin in enable_pins] == [21, 11]
+    assert all(pin[CONF_HOLD_STATE] for pin in enable_pins)