diff --git a/test/test_file_progress.cpp b/test/test_file_progress.cpp
index 66b22d87a..df5f97de6 100644
--- a/test/test_file_progress.cpp
+++ b/test/test_file_progress.cpp
@@ -104,5 +104,37 @@ TORRENT_TEST(init2)
 	}
 }
 
-// TODO: test the update function too
+TORRENT_TEST(update_simple_sequential)
+{
+	int const piece_size = 256;
 
+	file_storage fs;
+	fs.add_file("torrent/1", 100000);
+	fs.add_file("torrent/2", 100);
+	fs.add_file("torrent/3", 45000);
+	fs.set_piece_length(piece_size);
+	fs.set_num_pieces((int(fs.total_size()) + piece_size - 1) / piece_size);
+
+	piece_picker picker(4, fs.total_size() % 4, fs.num_pieces());
+
+	aux::file_progress fp;
+
+	fp.init(picker, fs);
+
+	int count = 0;
+
+	for (auto const idx : fs.piece_range())
+	{
+		fp.update(fs, idx, [&](file_index_t const file_index)
+		{
+			count++;
+
+			aux::vector<std::int64_t, file_index_t> vec;
+			fp.export_progress(vec);
+
+			TEST_EQUAL(vec[file_index], fs.file_size(file_index));
+		});
+	}
+
+	TEST_EQUAL(count, fs.num_files());
+}