tests/vfs_default: add compile test for vfs_default

tests/vfs_default/Makefile

@@ -0,0 +1,9 @@
+include ../Makefile.tests_common
+
+USEMODULE += vfs_default
+USEMODULE += vfs_auto_format
+
+USEMODULE += shell
+USEMODULE += shell_commands
+
+include $(RIOTBASE)/Makefile.include

tests/vfs_default/Makefile.ci

@@ -0,0 +1,11 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-leonardo \
+    arduino-nano \
+    atmega328p-xplained-mini \
+    arduino-duemilanove \
+    arduino-uno \
+    atmega328p \
+    stm32f030f4-demo \
+    samd10-xmini \
+    nucleo-l011k4 \
+    #

tests/vfs_default/main.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022 ML!PA Consulting GmbH
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for vfs_default
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "shell.h"
+#include "shell_commands.h"
+#include "vfs_default.h"
+
+int main(void)
+{
+    vfs_DIR mount = {0};
+
+    /* list mounted file systems */
+    puts("mount points:");
+    while (vfs_iterate_mount_dirs(&mount)) {
+        printf("\t%s\n", mount.mp->mount_point);
+    }
+    printf("\ndata dir: %s\n", VFS_DEFAULT_DATA);
+
+    /* start the shell */
+    char line_buf[SHELL_DEFAULT_BUFSIZE];
+    shell_run(NULL, line_buf, SHELL_DEFAULT_BUFSIZE);
+
+    return 0;
+}