sum: use slices.Equal

sum/sum_test.go

@@ -1,7 +1,7 @@
 package sum
 
 import (
-	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -22,8 +22,7 @@ func TestSumAll(t *testing.T) {
 	got := SumAll([]int{1, 2}, []int{0, 9})
 	exp := []int{3, 9}
 
-	// NOTE: check if any two variables are the same
+	if !slices.Equal(got, exp) {
-	if !reflect.DeepEqual(got, exp) {
 		t.Errorf("got %d, expected %d", got, exp)
 	}
 }