Solution

sumAll/sumAll.js

@@ -1,5 +1,21 @@
-const sumAll = function() {
-
+const sumAll = function(min, max) {
+    let temporal;
+    let message = "ERROR";
+    let sum = 0;
+    if(min < 0 || max < 0){
+        return message;
+    }else if(typeof min !== "number" || typeof max !== "number"){
+        return message;
+    }if(max < min ){
+        temporal = max;
+        max = min;
+        min = temporal;
     }
 
+    for (let index = min; index < max + 1; index++) {
+        sum += index;
+    }
+    return sum;
+};
+
 module.exports = sumAll

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');
   });
 });