@Test
public void testAbbreviateOnEmptyRepository() throws IOException {
ObjectId id = id("9d5b926ed164e8ee88d3b8b1e525d699adda01ba");
assertEquals(id.abbreviate(2), reader.abbreviate(id, 2));
assertEquals(id.abbreviate(7), reader.abbreviate(id, 7));
assertEquals(id.abbreviate(8), reader.abbreviate(id, 8));
assertEquals(id.abbreviate(10), reader.abbreviate(id, 10));
assertEquals(id.abbreviate(16), reader.abbreviate(id, 16));