diff --git a/src/hackerrank/warmup/mini_max_sum.rs b/src/hackerrank/warmup/mini_max_sum.rs
index 95cdbbb..2f971df 100644
--- a/src/hackerrank/warmup/mini_max_sum.rs
+++ b/src/hackerrank/warmup/mini_max_sum.rs
@@ -5,19 +5,21 @@ pub fn mini_max_sum(arr: &[i32]) -> String {
     panic!("Empty input");
   }
 
-  let mut tsum = 0;
-  let mut tmin: i32 = arr[0];
-  let mut tmax: i32 = arr[1];
+  let mut tsum: i64 = 0;
+  let mut tmin: i64 = arr[0].into();
+  let mut tmax: i64 = arr[1].into();
+  let mut tvalue: i64;
 
   for value in arr.iter() {
-    tsum += *value;
+    tvalue = *value as i64;
+    tsum += tvalue;
 
-    if *value < tmin {
-      tmin = *value;
+    if tvalue < tmin {
+      tmin = tvalue;
     }
 
-    if *value > tmax {
-      tmax = *value;
+    if tvalue > tmax {
+      tmax = tvalue;
     }
   }
 
diff --git a/tests/data/hackerrank/warmup/mini_max_sum.testcases.json b/tests/data/hackerrank/warmup/mini_max_sum.testcases.json
index b2d8c06..f3eebb8 100644
--- a/tests/data/hackerrank/warmup/mini_max_sum.testcases.json
+++ b/tests/data/hackerrank/warmup/mini_max_sum.testcases.json
@@ -1,4 +1,17 @@
 [
-  {"input": [1, 2, 3, 4, 5], "expected": "10 14"},
-  {"input": [5, 4, 3, 2, 1], "expected": "10 14"}
+  {
+    "title": "Sample",
+    "input": [1, 2, 3, 4, 5],
+    "expected": "10 14"
+  },
+  {
+    "title": "Reversed Sample",
+    "input": [5, 4, 3, 2, 1],
+    "expected": "10 14"
+  },
+  {
+    "title": "Test case 0",
+    "input": [256741038, 623958417, 467905213, 714532089, 938071625],
+    "expected": "2063136757 2744467344"
+  }
 ]
diff --git a/tests/hackerrank/warmup/mini_max_sum.rs b/tests/hackerrank/warmup/mini_max_sum.rs
index 6bf2f82..fd97fc8 100644
--- a/tests/hackerrank/warmup/mini_max_sum.rs
+++ b/tests/hackerrank/warmup/mini_max_sum.rs
@@ -12,7 +12,8 @@ mod tests {
   #[derive(Debug, Deserialize)]
   struct MiniMaxSumTest {
       input: Vec<i32>,
-      expected: String
+      expected: String,
+      title: String
   }
 
   static TEST_DATA: Lazy<Vec<MiniMaxSumTest>> =
diff --git a/tests/hackerrank/warmup/staircase.rs b/tests/hackerrank/warmup/staircase.rs
index 0e6206d..9b35d3d 100644
--- a/tests/hackerrank/warmup/staircase.rs
+++ b/tests/hackerrank/warmup/staircase.rs
@@ -10,12 +10,12 @@ mod tests {
   use super::*;
 
   #[derive(Debug, Deserialize)]
-  struct AveryBigSumTestCase {
+  struct StaircaseTestCase {
       input: i32,
       expected: String
   }
 
-  static TEST_DATA: Lazy<Vec<AveryBigSumTestCase>> =
+  static TEST_DATA: Lazy<Vec<StaircaseTestCase>> =
     Lazy::new(|| load_json("tests/data/hackerrank/warmup/staircase.testcases.json"));
 
   #[test]