message: Added unit test for exponential search
diff: @@ -630,6 +630,7 @@ mod tests {
  use schema::IndexRecordOption;
  use schema::SchemaBuilder;
  use schema::Term;
  + use super::exponential_search;
  use schema::INT_INDEXED;
  use DocId;
  use SkipResult;
  @@ -660,6 +661,13 @@ mod tests {
  .0
  }
  + #[test]
  + fn test_exponentiel_search() {
  + assert_eq!(exponential_search(0, &[1,2]), (0, 1));
  + assert_eq!(exponential_search(1, &[1,2]), (0, 1));
  + assert_eq!(exponential_search(7, &[1,2,3,4,5,6,7,8,9,10,11]), (3,7));
  + }
  +
  fn util_test_search_within_block(block: &[u32], target: u32) {
  assert_eq!(
  search_within_block(block, target),
  