Slightly improved loose object decompression test

Author: Byron

Diff for: gitdb/test/test_stream.py

@@ -16,7 +16,9 @@
     DecompressMemMapReader,
     FDCompressedSha1Writer,
     LooseObjectDB,
-    Sha1Writer
+    Sha1Writer,
+    MemoryDB,
+    IStream,
 )
 from gitdb.util import hex_to_bin
 
@@ -27,6 +29,7 @@
 
 import tempfile
 import os
+from io import BytesIO
 
 class TestStream(TestBase):
     """Test stream classes"""
@@ -144,11 +147,16 @@ def test_compressed_writer(self):
 
     def test_decompress_reader_special_case(self):
         odb = LooseObjectDB(fixture_path('objects'))
+        mdb = MemoryDB()
         for sha in ('888401851f15db0eed60eb1bc29dec5ddcace911',
                     '7bb839852ed5e3a069966281bb08d50012fb309b',):
             ostream = odb.stream(hex_to_bin(sha))
 
             # if there is a bug, we will be missing one byte exactly !
             data = ostream.read()
             assert len(data) == ostream.size
+
+            # Putting it back in should yield nothing new - after all, we have 
+            dump = mdb.store(IStream(ostream.type, ostream.size, BytesIO(data)))
+            assert dump.hexsha == sha
         # end for each loose object sha to test