From 532799f2e4efd71ae5c4ee181e2eae86c8925ee9 Mon Sep 17 00:00:00 2001
From: "Michael J. Curry" <currymj@fastmail.fm>
Date: Fri, 28 Oct 2016 12:52:32 -0400
Subject: [PATCH] Added rudimentary test for empty input

---
 src/indexer/log_merge_policy.rs | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/indexer/log_merge_policy.rs b/src/indexer/log_merge_policy.rs
index 9c741889a..216faa8fb 100644
--- a/src/indexer/log_merge_policy.rs
+++ b/src/indexer/log_merge_policy.rs
@@ -9,9 +9,9 @@ const LEVEL_LOG_SIZE: f64 = 0.75;
 
 impl MergePolicy for LogMergePolicy {
     fn compute_merge_candidates(&self, segments: &[SegmentMeta]) -> Vec<MergeCandidate> {
-        // what about when segments is empty??
-        // take log of size of each segment
-        // log2
+        if segments.is_empty() {
+            return Vec::new();
+        }
         let mut size_sorted_tuples = segments.iter()
             .map(|x| {x.num_docs})
             .enumerate()
@@ -52,3 +52,15 @@ impl Default for LogMergePolicy {
         LogMergePolicy
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use indexer::merge_policy::MergePolicy;
+    #[test]
+    fn test_log_merge_policy_empty() {
+        let y = Vec::new();
+        let result_list = LogMergePolicy::default().compute_merge_candidates(&y);
+        assert!(result_list.len() == 0);
+    }
+}
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