twister: Add configuration reader to pytest-twister-harness

[fundakol]

Added a class twister_harness.helpers.config_reader.ConfigReader that helps to read Kconfigs from a configuration file.

Added pytest fixture config_reader that provides a ConfigReader instance for reading configuration files.

This fixture allows tests to easily create a ConfigReader object by passing
the path to a configuration file. The ConfigReader reads the file and
provides a method to access the configuration data.

Example:

def test_config_value(config_reader):
    config = config_reader("pm.config")
    assert config.read("some_key") == "expected_value"

[gchwier]

Thanks for adding it! looks great, only minor comments

[hakehuang]

def test_config_value(config_reader):
    config = config_reader("pm.config")
    assert config.read("some_key") == "expected_value"

can we add more support to reader from and environ variable such as

config_path = os.enviroment["CONFIG_PATH"]
config = config_reader(f"{config_path}/pm.config")

[gchwier]

def test_config_value(config_reader):
    config = config_reader("pm.config")
    assert config.read("some_key") == "expected_value"

can we add more support to reader from and environ variable such as

config_path = os.enviroment["CONFIG_PATH"]
config = config_reader(f"{config_path}/pm.config")

This is example of test implementation, so you can provide the path as you want.
When using dut fixture, the easiest way is to take build dir from dut:

sysbuild_config = config_reader(dut.device_config.build_dir / "zephyr" / ".config")
app_config = config_reader(dut.device_config.app_build_dir / "zephyr" / ".config")
mcuboot_config = config_reader(dut.device_config.build_dir / "mcuboot" / "zephyr" / ".config")
cmake_cache = config_reader(dut.device_config.app_build_dir / "CMakeCache.txt")

or just take the path from env variable

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
1 Security Hotspot
0.0% Coverage on New Code
0.0% Duplication on New Code

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