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[utest][lwip]add lwip api testcase.
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‎.github/utest/lwip/lwip.cfg

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# dependencies
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CONFIG_RT_CONSOLEBUF_SIZE=1024
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CONFIG_RT_NAME_MAX=24
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CONFIG_RT_USING_CI_ACTION=y
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CONFIG_RT_LWIP_NETIF_LOOPBACK=y
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CONFIG_LWIP_NETIF_LOOPBACK=1
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CONFIG_RT_UTEST_TC_USING_LWIP=y
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CONFIG_RT_UTEST_LWIP_DNS_TEST=y
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CONFIG_RT_UTEST_LWIP_TCP_TEST=y
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CONFIG_RT_UTEST_LWIP_UDP_TEST=y
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CONFIG_RT_UTEST_LWIP_ICMP_TEST=y
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CONFIG_RT_UTEST_LWIP_SOCKET_OPT_TEST=y
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CONFIG_RT_UTEST_LWIP_ADDR_CONV_TEST=y
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CONFIG_RT_UTEST_LWIP_NETIF_TEST=y
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CONFIG_RT_UTEST_LWIP_TCP_PORT=1234
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CONFIG_RT_UTEST_LWIP_UDP_PORT=1235
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CONFIG_RT_UTEST_LWIP_TEST_URL="www.rt-thread.org"
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CONFIG_RT_UTEST_LWIP_TEST_ADDR="180.163.146.111"
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CONFIG_BSP_DRV_EMAC=y

‎.github/workflows/utest_auto_run.yml

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- platform: { UTEST: "A9", RTT_BSP: "bsp/qemu-vexpress-a9", QEMU_ARCH: "arm", QEMU_MACHINE: "vexpress-a9", SD_FILE: "sd.bin", KERNEL: "standard", "SMP_RUN":"" }
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config_file: "cpp11/cpp11.cfg"
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- platform: { UTEST: "A9", RTT_BSP: "bsp/qemu-vexpress-a9", QEMU_ARCH: "arm", QEMU_MACHINE: "vexpress-a9", SD_FILE: "sd.bin", KERNEL: "standard", "SMP_RUN":"" }
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config_file: "lwip/lwip.cfg"
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env:
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TEST_QEMU_ARCH: ${{ matrix.platform.QEMU_ARCH }}
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TEST_QEMU_MACHINE: ${{ matrix.platform.QEMU_MACHINE }}

‎Kconfig.utestcases

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rsource "components/drivers/audio/utest/Kconfig"
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rsource "components/dfs/utest/Kconfig"
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rsource "components/net/utest/Kconfig"
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endif
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‎components/net/utest/Kconfig

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if RT_USING_LWIP
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menu "LwIP Network Unit Testcase"
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config RT_UTEST_TC_USING_LWIP
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bool "lwIP API test"
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help
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Enable lwIP network stack unit tests including DNS resolution,
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TCP/UDP socket operations, and network interface tests
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if RT_UTEST_TC_USING_LWIP
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config RT_UTEST_LWIP_DNS_TEST
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bool "DNS resolution test"
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default y
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help
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Enable DNS resolution unit tests including gethostbyname()
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and gethostbyname_r() functions for hostname to IP resolution,
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as well as getaddrinfo() and freeaddrinfo() for address info
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retrieval and release. Tests verify successful resolution
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without hardcoded IP comparisons.
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config RT_UTEST_LWIP_TCP_TEST
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bool "TCP socket test"
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default y
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help
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Enable TCP socket unit tests including client-server communication
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with echo functionality, socket creation, binding, listening,
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accepting connections, data transmission with varying buffer sizes,
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socket options (TCP_NODELAY, SO_REUSEADDR, SO_REUSEPORT),
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and connection management (shutdown, close).
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config RT_UTEST_LWIP_UDP_TEST
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bool "UDP socket test"
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default y
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help
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Enable UDP socket unit tests including datagram transmission
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and reception, client-server echo communication, socket binding
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to any port, select() operations with timeout, recvfrom/sendto
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functions, and timeout handling for receive operations.
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config RT_UTEST_LWIP_ICMP_TEST
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bool "ICMP ping test"
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default y
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help
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Enable ICMP ping unit tests using raw sockets to send
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ICMP echo requests and receive echo replies. Tests verify
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basic ICMP functionality with loopback address (127.0.0.1).
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config RT_UTEST_LWIP_SOCKET_OPT_TEST
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bool "Socket options test"
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default y
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help
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Enable socket options unit tests including setsockopt()
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and getsockopt() functions. Tests verify setting and
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retrieving socket options such as SO_REUSEADDR.
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config RT_UTEST_LWIP_ADDR_CONV_TEST
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bool "Address conversion test"
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default y
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help
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Enable address conversion unit tests including inet_addr()
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for converting string IP addresses to binary format and
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inet_ntoa() for converting binary addresses back to strings.
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Tests verify proper conversion functionality.
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config RT_UTEST_LWIP_NETIF_TEST
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bool "Network interface management test"
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default y
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help
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Enable network interface management unit tests including
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netif_set_up(), netif_set_down(), and netif_set_default()
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functions. Tests verify interface state changes and
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default interface configuration.
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config RT_UTEST_LWIP_TCP_PORT
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int "TCP test port"
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default 1234
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range 1024 65535
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help
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Configure the TCP port number for unit test communication.
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Must be in the range 1024-65535 to avoid system ports
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config RT_UTEST_LWIP_UDP_PORT
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int "UDP test port"
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default 1235
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range 1024 65535
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help
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Configure the UDP port number for unit test communication.
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Must be in the range 1024-65535 to avoid system ports
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config RT_UTEST_LWIP_TEST_URL
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string "Test domain name"
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default "www.rt-thread.org"
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help
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Configure the domain name for DNS resolution tests.
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This domain will be resolved to verify DNS functionality
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config RT_UTEST_LWIP_TEST_ADDR
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string "Expected IP address"
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default "180.163.146.111"
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help
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Configure the expected IP address for DNS resolution verification.
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This should match the actual IP of the test domain
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endif
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endmenu
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endif

‎components/net/utest/SConscript

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Import('rtconfig')
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from building import *
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cwd = GetCurrentDir()
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src = []
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CPPPATH = [cwd]
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if GetDepend('RT_UTEST_TC_USING_LWIP'):
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# Add lwIP test source if enabled
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src += ['tc_lwip.c']
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# Define the test group with proper dependencies
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group = DefineGroup('utestcases', src, depend = ['RT_USING_UTESTCASES', 'RT_USING_LWIP'], CPPPATH = CPPPATH)
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Return('group')

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