test: drivers: modem: Add unit test for modem socket

Add unit test for modem socket context handling.

Signed-off-by: Joakim Andersson <joerchan@gmail.com>

tests/drivers/modem/modem_socket/CMakeLists.txt

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(device)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})
+
+target_include_directories(app PRIVATE
+    ${ZEPHYR_BASE}/drivers/modem
+    ${ZEPHYR_BASE}/subsys/net/lib/sockets
+)

tests/drivers/modem/modem_socket/prj.conf

@@ -0,0 +1,10 @@
+CONFIG_ZTEST=y
+
+CONFIG_NETWORKING=y
+CONFIG_NET_SOCKETS=y
+
+CONFIG_MODEM=y
+CONFIG_MODEM_SOCKET=y
+
+# Default y, not needed.
+CONFIG_ETH_DRIVER=n

tests/drivers/modem/modem_socket/src/main.c

@@ -0,0 +1,174 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (C) 2025, Joakim Andersson
+ */
+
+/**
+ * @addtogroup t_modem_driver
+ * @{
+ * @defgroup t_modem_socket test_modem_socket
+ * @}
+ */
+
+#include <zephyr/ztest.h>
+#include "modem_socket.h"
+
+#define MODEM_SOCKETS_MAX 3
+#define MODEM_SOCKETS_BASE_NUM 0
+struct modem_socket_config socket_config;
+struct modem_socket sockets[MODEM_SOCKETS_MAX];
+
+static const struct socket_op_vtable socket_fd_op_vtable = {
+};
+
+ZTEST(modem_socket, test_modem_socket_init_fd_zero)
+{
+	struct modem_socket *sock;
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	/* Check that fd 0 does not return a modem socket object. */
+	sock = modem_socket_from_fd(&socket_config, 0);
+
+	zassert_is_null(sock);
+}
+
+ZTEST(modem_socket, test_modem_socket_init_not_allocated)
+{
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_is_allocated(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+ZTEST(modem_socket, test_modem_socket_init_not_assigned)
+{
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_id_is_assigned(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+ZTEST(modem_socket, test_modem_socket_init_not_assigned_dynamic)
+{
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				true, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_id_is_assigned(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+static void test_modem_get_put_all(void)
+{
+	int fds[ARRAY_SIZE(sockets)];
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		fds[i] = modem_socket_get(&socket_config, AF_INET, SOCK_DGRAM, IPPROTO_TCP);
+		zassert_false(fds[i] < 0);
+	}
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		modem_socket_put(&socket_config, fds[i]);
+		/* Returned file description is freed by zsock_close, so we need to free it here. */
+		zvfs_free_fd(fds[i]);
+	}
+}
+
+ZTEST(modem_socket, test_modem_socket_get_put_fd_zero)
+{
+	struct modem_socket *sock;
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	test_modem_get_put_all();
+
+	/* Check that fd 0 does not return a modem socket object. */
+	sock = modem_socket_from_fd(&socket_config, 0);
+	zassert_is_null(sock);
+}
+
+ZTEST(modem_socket, test_modem_socket_get_put_not_allocated)
+{
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	test_modem_get_put_all();
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_is_allocated(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+ZTEST(modem_socket, test_modem_socket_get_put_not_assigned)
+{
+	int ret;
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				false, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	test_modem_get_put_all();
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_id_is_assigned(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+ZTEST(modem_socket, test_modem_socket_get_put_not_assigned_dynamic)
+{
+	int ret;
+
+	test_modem_get_put_all();
+
+	ret = modem_socket_init(&socket_config, sockets, MODEM_SOCKETS_MAX, MODEM_SOCKETS_BASE_NUM,
+				true, &socket_fd_op_vtable);
+	zassert_ok(ret);
+
+	for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+		bool result;
+
+		result = modem_socket_id_is_assigned(&socket_config, &sockets[i]);
+		zassert_false(result);
+	}
+}
+
+ZTEST_SUITE(modem_socket, NULL, NULL, NULL, NULL, NULL);

tests/drivers/modem/modem_socket/testcase.yaml

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+tests:
+  drivers.modem.modem_sockets:
+    tags:
+      - drivers
+      - modem
+    platform_allow:
+      - native_posix
+      - native_sim
+    integration_platforms:
+      - native_sim