diff --git a/src/lib.rs b/src/lib.rs
index e573e1d..b4d910d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(alloc)]
 #![feature(const_fn)]
+#![feature(const_str_len)]
 #![feature(nll)]
 #![cfg_attr(target_arch = "riscv", feature(match_default_bindings))]
 #![no_std]
@@ -14,6 +15,7 @@ extern crate static_assertions;
 extern crate spin;
 
 #[cfg(not(test))]
+#[allow(unused_macros)]
 macro_rules! eprintln {
     () => ();
     ($fmt:expr) => ();
diff --git a/src/sfs.rs b/src/sfs.rs
index f6060cc..a148daa 100644
--- a/src/sfs.rs
+++ b/src/sfs.rs
@@ -330,10 +330,10 @@ impl vfs::INode for INodeImpl {
         if info.type_!=vfs::FileType::Dir {
             return Err(FsError::NotDir)
         }
-        if name != "." {
+        if name == "." {
             return Err(FsError::IsDir)
         }
-        if name != ".." {
+        if name == ".." {
             return Err(FsError::IsDir)
         }
 
@@ -522,7 +522,7 @@ impl SimpleFileSystem {
             magic: MAGIC,
             blocks: blocks as u32,
             unused_blocks: blocks as u32 - 3,
-            info: Str32::from("simple file system"),
+            info: Str32::from(DEFAULT_INFO),
         };
         let free_map = {
             let mut bitset = BitVec::from_elem(BLKBITS, false);
diff --git a/src/structs.rs b/src/structs.rs
index e5e14a0..f81dd3d 100644
--- a/src/structs.rs
+++ b/src/structs.rs
@@ -168,6 +168,8 @@ pub const BLKSIZE: usize = 1usize << BLKSIZE_LOG2;
 pub const BLKSIZE_LOG2: u8 = 12;
 /// number of direct blocks in inode
 pub const NDIRECT: usize = 12;
+/// default sfs infomation string
+pub const DEFAULT_INFO: &str = "simple file system";
 /// max length of infomation
 pub const MAX_INFO_LEN: usize = 31;
 /// max length of filename
@@ -182,7 +184,7 @@ pub const BLKN_ROOT: BlockId = 1;
 pub const BLKN_FREEMAP: BlockId = 2;
 /// number of bits in a block
 pub const BLKBITS: usize = BLKSIZE * 8;
-///
+/// size of one entry
 pub const ENTRY_SIZE: usize = 4;
 /// number of entries in a block
 pub const BLK_NENTRY: usize = BLKSIZE / ENTRY_SIZE;
@@ -203,3 +205,4 @@ const_assert!(o1; size_of::<SuperBlock>() <= BLKSIZE);
 const_assert!(o2; size_of::<DiskINode>() <= BLKSIZE);
 const_assert!(o3; size_of::<DiskEntry>() <= BLKSIZE);
 const_assert!(o4; size_of::<IndirectBlock>() == BLKSIZE);
+const_assert!(o5; DEFAULT_INFO.len() <= MAX_INFO_LEN);
diff --git a/src/tests.rs b/src/tests.rs
index 6697ed3..bfa3ec3 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -22,7 +22,8 @@ fn _create_new_sfs() -> Arc<SimpleFileSystem> {
     SimpleFileSystem::create(Box::new(file), 32 * 4096)
 }
 
-//#[test]
+#[test]
+#[ignore]
 fn open_sample_file() {
     _open_sample_file();
 }
@@ -33,7 +34,8 @@ fn create_new_sfs() {
     let _root = sfs.root_inode();
 }
 
-// #[test]
+#[test]
+#[ignore]
 fn print_root() -> Result<()> {
     let sfs = _open_sample_file();
     let root = sfs.root_inode();
@@ -86,26 +88,26 @@ fn resize() -> Result<()> {
     Ok(())
 }
 
-// FIXME: `should_panic` tests will panic again on exit, due to `Dirty` drop
-
-//#[test]
-//#[should_panic]
-//fn resize_on_dir_should_panic() {
-//    let sfs = _create_new_sfs();
-//    let root = sfs.root_inode();
-//    root.resize(4096).unwrap();
-//    sfs.sync().unwrap();
-//}
-//
-//#[test]
-//#[should_panic]
-//fn resize_too_large_should_panic() {
-//    let sfs = _create_new_sfs();
-//    let root = sfs.root_inode();
-//    let file1 = root.create("file1", FileType::File).unwrap();
-//    file1.resize(1 << 28).unwrap();
-//    sfs.sync().unwrap();
-//}
+#[test]
+fn resize_on_dir_should_panic() -> Result<()> {
+   let sfs = _create_new_sfs();
+   let root = sfs.root_inode();
+   assert!(root.resize(4096).is_err());
+   sfs.sync()?;
+
+   Ok(())
+}
+
+#[test]
+fn resize_too_large_should_panic() -> Result<()> {
+   let sfs = _create_new_sfs();
+   let root = sfs.root_inode();
+   let file1 = root.create("file1", FileType::File)?;
+   assert!(file1.resize(1 << 28).is_err());
+   sfs.sync()?;
+
+   Ok(())
+}
 
 #[test]
 fn create_then_lookup() -> Result<()> {
@@ -142,7 +144,8 @@ fn arc_layout() {
     assert_eq!(ns, &[1usize, 1]);
 }
 
-// #[test]
+#[test]
+#[ignore]
 fn kernel_image_file_create() -> Result<()> {
     let sfs = _open_sample_file();
     let root = sfs.root_inode();
@@ -156,7 +159,8 @@ fn kernel_image_file_create() -> Result<()> {
     Ok(())
 }
 
-// #[test]
+#[test]
+#[ignore]
 fn kernel_image_file_unlink() -> Result<()> {
     let sfs = _open_sample_file();
     let root = sfs.root_inode();
@@ -170,8 +174,8 @@ fn kernel_image_file_unlink() -> Result<()> {
     Ok(())
 }
 
-
-// #[test]
+#[test]
+#[ignore]
 fn kernel_image_file_rename() -> Result<()> {
     let sfs = _open_sample_file();
     let root = sfs.root_inode();
@@ -186,7 +190,8 @@ fn kernel_image_file_rename() -> Result<()> {
     Ok(())
 }
 
-// #[test]
+#[test]
+#[ignore]
 fn kernel_image_file_move() -> Result<()> {
     let sfs = _open_sample_file();
     let root = sfs.root_inode();
diff --git a/src/vfs.rs b/src/vfs.rs
index 3ebb849..74a6bfb 100644
--- a/src/vfs.rs
+++ b/src/vfs.rs
@@ -42,7 +42,7 @@ impl INode {
     }
     pub fn list(&self) -> Result<Vec<String>> {
         let info = self.info()?;
-        if(info.type_ != FileType::Dir){
+        if info.type_ != FileType::Dir {
             return Err(FsError::NotDir);
         }
         Ok((0..info.size).map(|i| {
@@ -50,13 +50,13 @@ impl INode {
         }).collect())
     }
     pub fn lookup(&self, path: &str) -> Result<Arc<INode>> {
-        if(self.info()?.type_ != FileType::Dir){
+        if self.info()?.type_ != FileType::Dir {
             return Err(FsError::NotDir);
         }
         let mut result = self.find(".")?;
         let mut rest_path = path;
         while rest_path != "" {
-            if(result.info()?.type_!= FileType::Dir){
+            if result.info()?.type_!= FileType::Dir {
                 return Err(FsError::NotDir);
             }
             let name;