* Given: file without duplications
* Expected: {@link Collections#EMPTY_LIST} (no need to construct suffix-tree)
*/
@Test
public void noDuplications() {
CloneIndex index = createIndex();
Block[] fileBlocks = newBlocks("a", "1 2 3");
List<CloneGroup> result = detect(index, fileBlocks);
assertThat(result, sameInstance(Collections.EMPTY_LIST));
}