tests/extmod: Add littlefs tests.

tests/extmod/vfs_lfs_error.py

@@ -0,0 +1,116 @@
+# Test for VfsLittle using a RAM device, testing error handling
+
+try:
+    import uos
+    uos.VfsLfs1
+    uos.VfsLfs2
+except (ImportError, AttributeError):
+    print("SKIP")
+    raise SystemExit
+
+class RAMBlockDevice:
+    ERASE_BLOCK_SIZE = 1024
+
+    def __init__(self, blocks):
+        self.data = bytearray(blocks * self.ERASE_BLOCK_SIZE)
+
+    def readblocks(self, block, buf, off):
+        addr = block * self.ERASE_BLOCK_SIZE + off
+        for i in range(len(buf)):
+            buf[i] = self.data[addr + i]
+
+    def writeblocks(self, block, buf, off):
+        addr = block * self.ERASE_BLOCK_SIZE + off
+        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
+        if op == 6: # erase block
+            return 0
+
+def test(bdev, vfs_class):
+    print('test', vfs_class)
+
+    # mkfs with too-small block device
+    try:
+        vfs_class.mkfs(RAMBlockDevice(1))
+    except OSError:
+        print('mkfs OSError')
+
+    # mount with invalid filesystem
+    try:
+        vfs_class(bdev)
+    except OSError:
+        print('mount OSError')
+
+    # set up for following tests
+    vfs_class.mkfs(bdev)
+    vfs = vfs_class(bdev)
+    with vfs.open('testfile', 'w') as f:
+        f.write('test')
+    vfs.mkdir('testdir')
+
+    # ilistdir
+    try:
+        vfs.ilistdir('noexist')
+    except OSError:
+        print('ilistdir OSError')
+
+    # remove
+    try:
+        vfs.remove('noexist')
+    except OSError:
+        print('remove OSError')
+
+    # rmdir
+    try:
+        vfs.rmdir('noexist')
+    except OSError:
+        print('rmdir OSError')
+
+    # rename
+    try:
+        vfs.rename('noexist', 'somethingelse')
+    except OSError:
+        print('rename OSError')
+
+    # mkdir
+    try:
+        vfs.mkdir('testdir')
+    except OSError:
+        print('mkdir OSError')
+
+    # chdir to nonexistent
+    try:
+        vfs.chdir('noexist')
+    except OSError:
+        print('chdir OSError')
+    print(vfs.getcwd()) # check still at root
+
+    # chdir to file
+    try:
+        vfs.chdir('testfile')
+    except OSError:
+        print('chdir OSError')
+    print(vfs.getcwd()) # check still at root
+
+    # stat
+    try:
+        vfs.stat('noexist')
+    except OSError:
+        print('stat OSError')
+
+    # error during seek
+    with vfs.open('testfile', 'r') as f:
+        try:
+            f.seek(1 << 31)
+        except OSError:
+            print('seek OSError')
+
+bdev = RAMBlockDevice(30)
+test(bdev, uos.VfsLfs1)
+test(bdev, uos.VfsLfs2)