diff --git a/sum/sum.go b/sum/sum.go
index a403234..8667504 100644
--- a/sum/sum.go
+++ b/sum/sum.go
@@ -8,3 +8,7 @@ func Sum(numbers []int) int {
 	}
 	return sum
 }
+
+func SumAll(x []int, y []int) []int {
+	return []int{Sum(x), Sum(y)}
+}
diff --git a/sum/sum_test.go b/sum/sum_test.go
index e925ab5..03f38fd 100644
--- a/sum/sum_test.go
+++ b/sum/sum_test.go
@@ -1,6 +1,9 @@
 package sum
 
-import "testing"
+import (
+	"slices"
+	"testing"
+)
 
 func TestSum(t *testing.T) {
 	t.Run("collection of 5 numbers", func(t *testing.T) {
@@ -13,15 +16,12 @@ func TestSum(t *testing.T) {
 			t.Errorf("got %d, expected %d, given %v", got, exp, numbers)
 		}
 	})
-
-	t.Run("collection of any size", func(t *testing.T) {
-		numbers := []int{1, 2, 3}
-
-		got := Sum(numbers)
-		exp := 6
-
-		if got != exp {
-			t.Errorf("got %d, expected %d, given %v", got, exp, numbers)
-		}
-	})
+}
+
+func TestSumAll(t *testing.T) {
+	got := SumAll([]int{1, 2}, []int{0, 9})
+	exp := []int{3, 9}
+	if slices.Compare(got, exp) != 0 {
+		t.Errorf("got %d, expected %d", got, exp)
+	}
 }