posix: Tests for putmsg

Add tests for implentation and header file.

Signed-off-by: Abhinav Srivastava <[email protected]>

tests/posix/common/src/stropts.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2024 Abhinav Srivastava
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <zephyr/ztest.h>
+#include <stropts.h>
+#include <errno.h>
+
+ZTEST(stropts, test_putmsg)
+{
+	const struct strbuf *ctrl = NULL;
+	const struct strbuf *data = NULL;
+	int fd = -1;
+	int ret = putmsg(fd, ctrl, data, 0);
+
+	zassert_equal(ret, -1, "Expected return value -1, got %d", ret);
+	zassert_equal(errno, ENOSYS, "Expected errno ENOSYS, got %d", errno);
+}
+
+ZTEST_SUITE(stropts, NULL, NULL, NULL, NULL, NULL);

tests/posix/headers/src/stropts_h.c

@@ -0,0 +1,25 @@
+#include <ztest.h>
+#include <zephyr/posix/stropts.h>
+#include <stropts.h>
+/**
+ * @brief Test existence and basic functionality of stropts.h
+ *
+ * @see stropts.h
+ */
+ZTEST(posix_headers, test_stropts_h)
+{
+	zassert_not_null((void *)putmsg, "putmsg is null");
+
+	zassert_true(sizeof(((struct strbuf *)0)->maxlen) > 0, "maxlen size is 0");
+	zassert_true(sizeof(((struct strbuf *)0)->len) > 0, "len size is 0");
+	zassert_true(sizeof(((struct strbuf *)0)->buf) > 0, "buf size is 0");
+}
+
+void test_main(void)
+{
+	ztest_test_suite(posix_stropts_test,
+		ztest_unit_test(test_stropts_h)
+	);
+
+	ztest_run_test_suite(posix_stropts_test);
+}