add test assertions

Author: marvin-j97

tests/compression.rs

@@ -3,7 +3,7 @@ use value_log::{
     Compressor, Config, IndexReader, IndexWriter, MockIndex, MockIndexWriter, ValueLog,
 };
 
-#[derive(Clone, Default)]
+#[derive(Clone, Debug, Default)]
 struct Lz4Compressor;
 impl Compressor for Lz4Compressor {
     fn compress(&self, bytes: &[u8]) -> value_log::Result<Vec<u8>> {
@@ -45,9 +45,18 @@ fn compression() -> value_log::Result<()> {
         );
     }
 
+    {
+        let segments = value_log.manifest.list_segments();
+        let segment = segments.first().unwrap();
+        assert_eq!(segment.meta.compressed_bytes, 32);
+        assert_eq!(segment.meta.total_uncompressed_bytes, value.len() as u64);
+    }
+
     {
         let index_writer = MockIndexWriter(index.clone());
-        value_log.major_compact(&index, index_writer)?;
+        let bytes_saved = value_log.major_compact(&index, index_writer)?;
+
+        assert_eq!(0, bytes_saved);
 
         let vhandle = index.get(key.as_bytes())?.unwrap();
 
@@ -57,5 +66,12 @@ fn compression() -> value_log::Result<()> {
         );
     }
 
+    {
+        let segments = value_log.manifest.list_segments();
+        let segment = segments.first().unwrap();
+        assert_eq!(segment.meta.compressed_bytes, 32);
+        assert_eq!(segment.meta.total_uncompressed_bytes, value.len() as u64);
+    }
+
     Ok(())
 }