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-rw-r--r--tests/extmod/ujson_dump_iobase.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/extmod/ujson_dump_iobase.py b/tests/extmod/ujson_dump_iobase.py
index d30d1b561..51d507cd1 100644
--- a/tests/extmod/ujson_dump_iobase.py
+++ b/tests/extmod/ujson_dump_iobase.py
@@ -24,6 +24,7 @@ class S(io.IOBase):
# uPy passes a bytearray, CPython passes a str
buf = str(buf, 'ascii')
self.buf += buf
+ return len(buf)
# dump to the user stream