1 files changed, 74 insertions, 0 deletions
diff --git a/tests/extmod/vfs_fat_mtime.py b/tests/extmod/vfs_fat_mtime.py
new file mode 100644
index 0000000000..d8fd66b75f
--- /dev/null
+++ b/tests/extmod/vfs_fat_mtime.py
@@ -0,0 +1,74 @@
+# Test for VfsFat using a RAM device, mtime feature
+
+try:
+    import utime, uos
+
+    utime.time
+    utime.sleep
+    uos.VfsFat
+except (ImportError, AttributeError):
+    print("SKIP")
+    raise SystemExit
+
+
+class RAMBlockDevice:
+    ERASE_BLOCK_SIZE = 512
+
+    def __init__(self, blocks):
+        self.data = bytearray(blocks * self.ERASE_BLOCK_SIZE)
+
+    def readblocks(self, block, buf):
+        addr = block * self.ERASE_BLOCK_SIZE
+        for i in range(len(buf)):
+            buf[i] = self.data[addr + i]
+
+    def writeblocks(self, block, buf):
+        addr = block * self.ERASE_BLOCK_SIZE
+        for i in range(len(buf)):
+            self.data[addr + i] = buf[i]
+
+    def ioctl(self, op, arg):
+        if op == 4:  # block count
+            return len(self.data) // self.ERASE_BLOCK_SIZE
+        if op == 5:  # block size
+            return self.ERASE_BLOCK_SIZE
+
+
+def test(bdev, vfs_class):
+    print("test", vfs_class)
+
+    # Initial format of block device.
+    vfs_class.mkfs(bdev)
+
+    # construction
+    vfs = vfs_class(bdev)
+
+    # Create an empty file, should have a timestamp.
+    current_time = int(utime.time())
+    vfs.open("test1", "wt").close()
+
+    # Wait 2 seconds so mtime will increase (FAT has 2 second resolution).
+    utime.sleep(2)
+
+    # Create another empty file, should have a timestamp.
+    vfs.open("test2", "wt").close()
+
+    # Stat the files and check mtime is non-zero.
+    stat1 = vfs.stat("test1")
+    stat2 = vfs.stat("test2")
+    print(stat1[8] != 0, stat2[8] != 0)
+
+    # Check that test1 has mtime which matches time.time() at point of creation.
+    # TODO this currently fails on the unix port because FAT stores timestamps
+    # in localtime and stat() is UTC based.
+    # print(current_time - 1 <= stat1[8] <= current_time + 1)
+
+    # Check that test1 is older than test2.
+    print(stat1[8] < stat2[8])
+
+    # Unmount.
+    vfs.umount()
+
+
+bdev = RAMBlockDevice(50)
+test(bdev, uos.VfsFat)