tests: posix: common: init check for stdin, stdout, and stderr

Add a test to help ensure stdin, stdout, and stderr are
initialized statically.

Signed-off-by: Christopher Friedt <[email protected]>

Author: Christopher Friedt

tests/posix/common/src/_main.c

@@ -4,8 +4,18 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <pthread.h>
-
 #include <zephyr/ztest.h>
 
-ZTEST_SUITE(posix_apis, NULL, NULL, NULL, NULL, NULL);
+extern bool fdtable_fd_is_initialized(int fd);
+
+static void *setup(void)
+{
+	/* ensure that the the stdin, stdout, and stderr fdtable entries are initialized */
+	zassert_true(fdtable_fd_is_initialized(0));
+	zassert_true(fdtable_fd_is_initialized(1));
+	zassert_true(fdtable_fd_is_initialized(2));
+
+	return NULL;
+}
+
+ZTEST_SUITE(posix_apis, NULL, setup, NULL, NULL, NULL);