Add tests for crystal callback wiring in upload_using_esptool

Tests both the in-process (run_external_command) and subprocess
(run_external_process) paths to ensure line_callbacks are passed.

tests/unit_tests/test_main.py

@@ -6,6 +6,7 @@ from collections.abc import Generator
 from dataclasses import dataclass
 import json
 import logging
+import os
 from pathlib import Path
 import re
 import time
@@ -3360,3 +3361,63 @@ def test_crystal_freq_callback_no_crystal_line() -> None:
     assert callback("Chip type: ESP8684H") is None
     assert callback("MAC: a0:b7:65:8b:16:d4") is None
     assert callback("") is None
+
+
+def test_upload_using_esptool_passes_crystal_callback(
+    tmp_path: Path,
+    mock_run_external_command_main: Mock,
+    mock_get_idedata: Mock,
+) -> None:
+    """Test that upload_using_esptool passes crystal freq callback for ESP32."""
+    setup_core(platform=PLATFORM_ESP32, tmp_path=tmp_path, name="test")
+    CORE.data[KEY_ESP32] = {KEY_VARIANT: VARIANT_ESP32}
+
+    # Create sdkconfig with XTAL_FREQ
+    build_dir = Path(CORE.build_path)
+    build_dir.mkdir(parents=True, exist_ok=True)
+    sdkconfig = build_dir / "sdkconfig.test"
+    sdkconfig.write_text("CONFIG_XTAL_FREQ=40\n")
+
+    mock_idedata = MagicMock(spec=platformio_api.IDEData)
+    mock_idedata.firmware_bin_path = tmp_path / "firmware.bin"
+    mock_idedata.extra_flash_images = []
+    mock_get_idedata.return_value = mock_idedata
+    (tmp_path / "firmware.bin").touch()
+
+    config = {CONF_ESPHOME: {"platformio_options": {}}}
+    upload_using_esptool(config, "/dev/ttyUSB0", None, None)
+
+    # Verify line_callbacks was passed with the crystal callback
+    call_kwargs = mock_run_external_command_main.call_args[1]
+    assert "line_callbacks" in call_kwargs
+    assert len(call_kwargs["line_callbacks"]) == 1
+
+
+def test_upload_using_esptool_subprocess_passes_crystal_callback(
+    mock_run_external_process: Mock,
+    mock_get_idedata: Mock,
+    tmp_path: Path,
+) -> None:
+    """Test that crystal freq callback is passed via run_external_process."""
+    setup_core(platform=PLATFORM_ESP32, tmp_path=tmp_path, name="test")
+    CORE.data[KEY_ESP32] = {KEY_VARIANT: VARIANT_ESP32}
+
+    # Create sdkconfig with XTAL_FREQ
+    build_dir = Path(CORE.build_path)
+    build_dir.mkdir(parents=True, exist_ok=True)
+    sdkconfig = build_dir / "sdkconfig.test"
+    sdkconfig.write_text("CONFIG_XTAL_FREQ=40\n")
+
+    mock_idedata = MagicMock(spec=platformio_api.IDEData)
+    mock_idedata.firmware_bin_path = tmp_path / "firmware.bin"
+    mock_idedata.extra_flash_images = []
+    mock_get_idedata.return_value = mock_idedata
+    (tmp_path / "firmware.bin").touch()
+
+    config = {CONF_ESPHOME: {"platformio_options": {}}}
+    with patch.dict(os.environ, {"ESPHOME_USE_SUBPROCESS": "1"}):
+        upload_using_esptool(config, "/dev/ttyUSB0", None, None)
+
+    call_kwargs = mock_run_external_process.call_args[1]
+    assert "line_callbacks" in call_kwargs
+    assert len(call_kwargs["line_callbacks"]) == 1