diff --git a/shen-nbt5/src/lib.rs b/shen-nbt5/src/lib.rs
index fedf84b..0d0db11 100644
--- a/shen-nbt5/src/lib.rs
+++ b/shen-nbt5/src/lib.rs
@@ -3,6 +3,9 @@
 //     Little,
 // }
 
+#[cfg(test)]
+mod tests;
+
 /// 用于读取 NBT 数据
 pub struct NbtReader<'data> {
     /// NBT 数据
@@ -81,14 +84,16 @@ impl NbtReader<'_> {
     }
     pub fn read_int_array(&mut self, len: usize) -> &[i32] {
         unsafe {
+            let value = std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i32, len);
             self.cursor += len * 4;
-            std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i32, len)
+            value
         }
     }
     pub fn read_long_array(&mut self, len: usize) -> &[i64] {
         unsafe {
+            let value = std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i64, len);
             self.cursor += len * 8;
-            std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i64, len)
+            value
         }
     }
 
diff --git a/shen-nbt5/src/tests.rs b/shen-nbt5/src/tests.rs
new file mode 100644
index 0000000..0b60653
--- /dev/null
+++ b/shen-nbt5/src/tests.rs
@@ -0,0 +1,38 @@
+use crate::{NbtReader, NbtValue};
+
+#[test]
+fn basic_init() {
+    let data = vec![0x01, 0x02, 0x03, 0x04];
+    let reader = NbtReader::new(&data);
+    assert_eq!(reader.cursor, 0);
+    assert_eq!(reader.data, &data);
+}
+
+
+#[test]
+fn read_i8() {
+    let data = vec![0x01, 0x02, 0x03, 0x04];
+    let mut reader = NbtReader::new(&data);
+    assert_eq!(reader.read_i8(), 0x01);
+    assert_eq!(reader.cursor, 1);
+    assert_eq!(reader.read_i8(), 0x02);
+    assert_eq!(reader.cursor, 2);
+}
+
+#[test]
+fn read_array() {
+    let data = vec![0x01, 0x02, 0x03, 0x04];
+    let mut reader = NbtReader::new(&data);
+    assert_eq!(reader.read_u8_array(2), &[0x01, 0x02]);
+    assert_eq!(reader.cursor, 2);
+    assert_eq!(reader.read_i8_array(2), &[0x03, 0x04]);
+    assert_eq!(reader.cursor, 4);
+}
+
+#[test]
+fn read_long_array() {
+    let data = vec![0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08];
+    let mut reader = NbtReader::new(&data);
+    assert_eq!(reader.read_long_array(1), &[i64::from_be_bytes([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08])]);
+    assert_eq!(reader.cursor, 8);
+}