diff --git a/sumAll/sumAll.js b/sumAll/sumAll.js
index 4030fe8..af48119 100644
--- a/sumAll/sumAll.js
+++ b/sumAll/sumAll.js
@@ -1,5 +1,20 @@
-const sumAll = function() {
+const sumAll = function (a, b) {
+    if (!Number.isInteger(a) || !Number.isInteger(b))
+        return 'ERROR';
 
+    if (a < 0 || b < 0)
+        return 'ERROR';
+
+    if (a > b) {
+        let temp = b;
+        b = a;
+        a = temp;
+    }
+    let ans = 0;
+    for (let i = a; i <= b; i++)
+        ans += i;
+
+    return ans;
 }
 
 module.exports = sumAll
diff --git a/sumAll/sumAll.spec.js b/sumAll/sumAll.spec.js
index 520adc1..2a584a6 100644
--- a/sumAll/sumAll.spec.js
+++ b/sumAll/sumAll.spec.js
@@ -4,19 +4,19 @@ describe('sumAll', function() {
   it('sums numbers within the range', function() {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  xit('works with large numbers', function() {
+  it('works with large numbers', function() {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  xit('works with larger number first', function() {
+  it('works with larger number first', function() {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  xit('returns ERROR with negative numbers', function() {
+  it('returns ERROR with negative numbers', function() {
     expect(sumAll(-10, 4)).toEqual('ERROR');
   });
-  xit('returns ERROR with non-number parameters', function() {
+  it('returns ERROR with non-number parameters', function() {
     expect(sumAll(10, "90")).toEqual('ERROR');
   });
-  xit('returns ERROR with non-number parameters', function() {
+  it('returns ERROR with non-number parameters', function() {
     expect(sumAll(10, [90, 1])).toEqual('ERROR');
   });
 });