Add check for truncated stream

Author: rhpvorderman

tests/test_igzip.py

@@ -62,6 +62,16 @@ def test_igzip_reader_read_zero():
     assert test.read(0) == b""
 
 
+def test_igzipfile_read_truncated():
+    # Chop of trailer (8 bytes) and part of DEFLATE stream
+    data = io.BytesIO(COMPRESSED_DATA[:-10])
+    test = igzip.GzipFile(fileobj=data, mode="rb")
+    with pytest.raises(EOFError) as error:
+        test.read()
+    error.match("Compressed file ended before the end-of-stream marker was "
+                "reached")
+
+
 @pytest.mark.parametrize("level", range(1, 10))
 def test_decompress_stdin_stdout(capsysbinary, level):
     """Test if the command line can decompress data that has been compressed