tests/extmod: Add vfs_posix.py test for uos.VfsPosix class.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/vfs_posix.py

@@ -0,0 +1,23 @@
+# Test for VfsPosix
+
+try:
+    import uos
+
+    uos.VfsPosix
+except (ImportError, AttributeError):
+    print("SKIP")
+    raise SystemExit
+
+
+# getcwd and chdir
+curdir = uos.getcwd()
+uos.chdir("/")
+print(uos.getcwd())
+uos.chdir(curdir)
+print(uos.getcwd() == curdir)
+
+# stat
+print(type(uos.stat("/")))
+
+# listdir and ilistdir
+print(type(uos.listdir("/")))

tests/extmod/vfs_posix.py.exp

@@ -0,0 +1,4 @@
+/
+True
+<class 'tuple'>
+<class 'list'>