diff --git a/src/cli/src/main.rs b/src/cli/src/main.rs
index e8c27ac..bd245b9 100644
--- a/src/cli/src/main.rs
+++ b/src/cli/src/main.rs
@@ -40,6 +40,9 @@ fn main() {
 
     // println!("{} => {}", r, r.to_common_code());
 
-    klotski_ffi::demo();
+    let all_cases = klotski_ffi::all_cases_fetch();
+    for &code in &all_cases[..16] {
+        println!("{:09X}", code);
+    }
 
 }
diff --git a/src/rust_ffi/src/all_cases.rs b/src/rust_ffi/src/all_cases.rs
index ae21b6f..4668c0e 100644
--- a/src/rust_ffi/src/all_cases.rs
+++ b/src/rust_ffi/src/all_cases.rs
@@ -1,37 +1,71 @@
 use crate::core::Core;
 
 lazy_static! {
-    static ref BASIC_RANGES: Vec<u32> = {
-        unsafe {
-            Core::basic_ranges_build();
-            let mut buffer: Vec<u32> = vec![0; Core::BASIC_RANGES_SIZE as usize];
-            Core::export_basic_ranges(&mut buffer[0]);
-            buffer
-        }
-    };
+    static ref ALL_CASES: Vec<u64> = build_all_cases();
+    static ref BASIC_RANGES: Vec<u32> = build_basic_ranges();
 }
 
-pub fn demo() {
-
-    println!("demo start");
-
+#[inline]
+pub fn all_cases_fetch() -> &'static Vec<u64> {
+    &(*ALL_CASES)
+}
 
+#[inline]
+#[allow(dead_code)]
+pub fn basic_ranges_fetch() -> &'static Vec<u32> {
+    &(*BASIC_RANGES)
+}
 
-    println!("demo complete");
+fn build_all_cases() -> Vec<u64> {
+    unsafe {
+        Core::all_cases_build();
+        let mut buffer: Vec<u64> = vec![0; Core::ALL_CASES_SIZE as usize];
+        Core::export_all_cases(&mut buffer[0]);
+        buffer
+    }
+}
 
+fn build_basic_ranges() -> Vec<u32> {
+    unsafe {
+        Core::basic_ranges_build();
+        let mut buffer: Vec<u32> = vec![0; Core::BASIC_RANGES_SIZE as usize];
+        Core::export_basic_ranges(&mut buffer[0]);
+        buffer
+    }
 }
 
 #[cfg(test)]
 mod tests {
     use crypto::md5::Md5;
     use crypto::digest::Digest;
-    use crate::all_cases::BASIC_RANGES;
+    use crate::all_cases::{ALL_CASES, all_cases_fetch, BASIC_RANGES, basic_ranges_fetch};
 
     const ALL_CASES_MD5: &str = "3888e9fab8d3cbb50908b12b147cfb23";
     const BASIC_RANGES_MD5: &str = "6f385dc171e201089ff96bb010b47212";
 
+    #[test]
+    fn all_cases() {
+        assert_eq!(&(*ALL_CASES), all_cases_fetch());
+    }
+
     #[test]
     fn basic_ranges() {
+        assert_eq!(&(*BASIC_RANGES), basic_ranges_fetch());
+    }
+
+    #[test]
+    fn all_cases_data() {
+        let mut md5 = Md5::new();
+        let mut tmp = String::new();
+        for &common_code in &(*ALL_CASES) {
+            tmp.push_str(&format!("{:09X}\n", common_code));
+        }
+        md5.input_str(&tmp);
+        assert_eq!(md5.result_str(), ALL_CASES_MD5);
+    }
+
+    #[test]
+    fn basic_ranges_data() {
         let mut md5 = Md5::new();
         let mut tmp = String::new();
         for &range in &(*BASIC_RANGES) {
diff --git a/src/rust_ffi/src/lib.rs b/src/rust_ffi/src/lib.rs
index c09e78a..fb3e24e 100644
--- a/src/rust_ffi/src/lib.rs
+++ b/src/rust_ffi/src/lib.rs
@@ -10,6 +10,6 @@ pub use codec::RawCode;
 pub use codec::ShortCode;
 pub use codec::CommonCode;
 
-pub use metadata::load_metadata as metadata;
+pub use all_cases::all_cases_fetch;
 
-pub use all_cases::demo;
+pub use metadata::load_metadata as metadata;