Feed data from file before _unpack()

1 files changed, 19 insertions, 0 deletions

diff --git a/test/test_unpack_file.py b/test/test_unpack_file.py
new file mode 100644
index 0000000..1563008
--- /dev/null
+++ b/test/test_unpack_file.py
@@ -0,0 +1,19 @@
+from io import BytesIO
+from msgpack import Unpacker, packb, OutOfData
+from pytest import raises
+
+
+def test_unpack_array_header_from_file():
+    f = BytesIO(packb([1,2,3,4]))
+    unpacker = Unpacker(f)
+    assert unpacker.read_array_header() == 4
+    assert unpacker.unpack() == 1
+    assert unpacker.unpack() == 2
+    assert unpacker.unpack() == 3
+    assert unpacker.unpack() == 4
+    with raises(OutOfData):
+        unpacker.unpack()
+
+
+if __name__ == '__main__':
+    test_unpack_array_header_from_file()