File test_api_validation.py¶

#******************************************************************************
# ISO-TP-C: ISO 15765-2 Protocol Implementation
#
# Project:     ISO-TP-C - Embedded-Grade Refactoring & Optimization
# Description: A high-performance, embedded-grade implementation of the ISO 15765-2 (ISO-TP) protocol in C,
#              designed for automotive and industrial applications. This project focuses on refactoring and optimizing
#              the codebase to achieve maximum efficiency, reliability, and maintainability while adhering to the ISO-TP standard.
#
# Author:      Anton Vynohradov
# Email:       avynohradov@systemfromscratch.com
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# License:     MIT License
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# Copyright (c) 2026 Anton Vynohradov
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"""! @file test_api_validation.py
@brief Integration tests for API input validation.
@details Exercises guardrails for invalid inputs across init, receive, and FC params.
@note These tests expect Python bindings to raise ValueError.
"""

# =============================================================================
# IMPORTS
# =============================================================================

import pyisotp
import pytest

# =============================================================================
# FUNCTION PROTOTYPES
# =============================================================================


def test_init_rejects_zero_buffers():
    """! @brief Verify init rejects zero-length buffers.
    @details Validates both send and receive buffer size checks.
    """
    with pytest.raises(ValueError):
        pyisotp.init(0x700, 0, 16)

    with pytest.raises(ValueError):
        pyisotp.init(0x700, 16, 0)


def test_receive_rejects_invalid_bufsize():
    """! @brief Verify receive rejects invalid buffer sizes.
    @details Ensures zero length is rejected by the binding.
    """
    link = pyisotp.init(0x700, 64, 64)
    with pytest.raises(ValueError):
        pyisotp.receive(link, 0)


def test_set_fc_params_rejects_large_block_size():
    """! @brief Verify flow control params reject oversized block size.
    @details Block size values above 255 must be rejected.
    """
    link = pyisotp.init(0x700, 64, 64)
    with pytest.raises(ValueError):
        pyisotp.set_fc_params(link, 256, 0)