add compaction tests and fix bugs in compaction

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm/src/tests/week2_day4.rs

@@ -0,0 +1,28 @@
+use tempfile::tempdir;
+
+use crate::{
+    compact::{CompactionOptions, LeveledCompactionOptions},
+    lsm_storage::{LsmStorageOptions, MiniLsm},
+};
+
+use super::harness::{check_compaction_ratio, compaction_bench};
+
+#[test]
+fn test_integration() {
+    let dir = tempdir().unwrap();
+    let storage = MiniLsm::open(
+        &dir,
+        LsmStorageOptions::default_for_week2_test(CompactionOptions::Leveled(
+            LeveledCompactionOptions {
+                level0_file_num_compaction_trigger: 2,
+                level_size_multiplier: 2,
+                base_level_size_mb: 1,
+                max_levels: 4,
+            },
+        )),
+    )
+    .unwrap();
+
+    compaction_bench(storage.clone());
+    check_compaction_ratio(storage.clone());
+}