remove unnecessary files

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

mini-lsm/src/iterators/tests.rs

@@ -1,40 +0,0 @@
-use anyhow::Result;
-use bytes::Bytes;
-
-use super::StorageIterator;
-
-pub mod merge_iterator_test;
-pub mod two_merge_iterator_test;
-
-#[derive(Clone)]
-pub struct MockIterator {
-    pub data: Vec<(Bytes, Bytes)>,
-    pub index: usize,
-}
-
-impl MockIterator {
-    pub fn new(data: Vec<(Bytes, Bytes)>) -> Self {
-        Self { data, index: 0 }
-    }
-}
-
-impl StorageIterator for MockIterator {
-    fn next(&mut self) -> Result<()> {
-        if self.index < self.data.len() {
-            self.index += 1;
-        }
-        Ok(())
-    }
-
-    fn key(&self) -> &[u8] {
-        self.data[self.index].0.as_ref()
-    }
-
-    fn value(&self) -> &[u8] {
-        self.data[self.index].1.as_ref()
-    }
-
-    fn is_valid(&self) -> bool {
-        self.index < self.data.len()
-    }
-}