test-hgsql-hggit: demostrate bytearray encoding error

Summary: This is caused by D13516212, and not covered by tests.

Reviewed By: DurhamG, StanislavGlebik

Differential Revision: D14025817

fbshipit-source-id: 8a529085c40c5d2ae17ccf3de1ccea22c8d7dbd2

tests/test-hgsql-hggit.t

@@ -0,0 +1,34 @@
+  $ . "$RUNTESTDIR/hgsql/library.sh"
+  $ . "$RUNTESTDIR/hggit/testutil"
+  $ shorttraceback
+  $ enable lz4revlog
+
+  $ git init a-git
+  Initialized empty Git repository in $TESTTMP/a-git/.git/
+  $ cd a-git
+
+Make "a" compressable
+
+  >>> open("a", "w").write("0\n" * 5000)
+  $ git add a
+  $ git commit -m a
+  [master (root-commit) *] a (glob)
+   1 file changed, 5000 insertions(+)
+   create mode 100644 a
+
+Setup an hgsql repo
+
+  $ cd $TESTTMP
+  $ initserver a-hg a-hg
+  $ cd a-hg
+
+Pull from git
+
+  $ hg pull $TESTTMP/a-git
+  pulling from $TESTTMP/a-git
+  importing git objects into hg
+  transaction abort!
+  rollback completed
+  ProgrammingError: Failed processing format-parameters; 'CustomConverter' object has no attribute '_bytearray_to_mysql'
+  [255]
+