diff --git a/members/libpt-bintols/tests/split_numbers.rs b/members/libpt-bintols/tests/split_numbers.rs
new file mode 100644
index 0000000..52b5ac5
--- /dev/null
+++ b/members/libpt-bintols/tests/split_numbers.rs
@@ -0,0 +1,35 @@
+use libpt_bintols::split_numbers::*;
+
+#[test]
+fn split_u128() {
+    let source = [16, 255, 256, 0, u128::MAX, u64::MAX as u128];
+    let correct = [
+        vec![16],
+        vec![255],
+        vec![255, 1],
+        vec![0],
+        vec![
+            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        ],
+        vec![255, 255, 255, 255, 255, 255, 255, 255],
+    ];
+    for (i, n) in source.iter().enumerate() {
+        assert_eq!(unsigned_to_vec(*n), correct[i]);
+    }
+}
+
+#[test]
+fn split_u64() {
+    let source = [16, 255, 256, 0, u64::MAX, u32::MAX as u64];
+    let correct = [
+        vec![16],
+        vec![255],
+        vec![255, 1],
+        vec![0],
+        vec![255, 255, 255, 255, 255, 255, 255, 255],
+        vec![255, 255, 255, 255],
+    ];
+    for (i, n) in source.iter().enumerate() {
+        assert_eq!(unsigned_to_vec(*n), correct[i]);
+    }
+}