storage/filesystem: dotgit, Reproduce packfile parse error. Fixes #1149

Author: vvatanabe

storage/filesystem/dotgit/dotgit_test.go

@@ -463,6 +463,11 @@ func testObjectPacks(c *C, fs billy.Filesystem, dir *DotGit, f *fixtures.Fixture
 	c.Assert(err, IsNil)
 	err = badFile.Close()
 	c.Assert(err, IsNil)
+	// temporary file generated by git gc
+	tmpFile, err := fs.Create("objects/pack/.tmp-11111-pack-58rf8y4wm1b1k52bpe0kdlx6lpreg6ahso8n3ylc.pack")
+	c.Assert(err, IsNil)
+	err = tmpFile.Close()
+	c.Assert(err, IsNil)
 
 	hashes2, err := dir.ObjectPacks()
 	c.Assert(err, IsNil)