diff --git a/codego/core/utils/utils.go b/codego/core/utils/utils.go
index 7b5bb8a..0bc8cd5 100644
--- a/codego/core/utils/utils.go
+++ b/codego/core/utils/utils.go
@@ -2,7 +2,6 @@ package utils
 
 import (
 	"encoding/json"
-	"log"
 	"sort"
 	"strings"
 )
@@ -49,12 +48,10 @@ func Max2(x int, y int) int {
 }
 
 func MinList(x []int) int {
-	var val int
 	if len(x) == 0 {
-		log.Fatal("Cannot compute the maximum of an empty array.")
-		return 0
+		panic("Cannot compute the maximum of an empty array.")
 	}
-	val = x[0]
+	var val int = x[0]
 	for i, val_ := range x {
 		if i > 0 {
 			val = Min2(val, val_)
@@ -64,12 +61,10 @@ func MinList(x []int) int {
 }
 
 func MaxList(x []int) int {
-	var val int
 	if len(x) == 0 {
-		log.Fatal("Cannot compute the maximum of an empty array.")
-		return 0
+		panic("Cannot compute the maximum of an empty array.")
 	}
-	val = x[0]
+	var val int = x[0]
 	for i, val_ := range x {
 		if i > 0 {
 			val = Max2(val, val_)
@@ -78,6 +73,14 @@ func MaxList(x []int) int {
 	return val
 }
 
+func SumList(x []int) int {
+	var val int = 0
+	for _, val_ := range x {
+		val += val_
+	}
+	return val
+}
+
 /* ---------------------------------------------------------------- *
  * METHODS: for string lists
  * ---------------------------------------------------------------- */
diff --git a/codego/core/utils/utils_test.go b/codego/core/utils/utils_test.go
index e1270fc..44ef4e3 100644
--- a/codego/core/utils/utils_test.go
+++ b/codego/core/utils/utils_test.go
@@ -13,7 +13,28 @@ import (
 )
 
 /* ---------------------------------------------------------------- *
- * TESTCASE Min2, Max2, MinList, MaxList
+ * TESTCASE JsonToArrayOfStrings
+ * ---------------------------------------------------------------- */
+
+func TestJsonToArrayOfStrings(test *testing.T) {
+	var assert = assert.New(test)
+	var result []string
+	utils.JsonToArrayOfStrings("[]", &result)
+	assert.Equal([]string{}, result)
+	utils.JsonToArrayOfStrings("[ \"ganimed\" ]", &result)
+	assert.Equal([]string{"ganimed"}, result)
+	utils.JsonToArrayOfStrings("[ \"ganimed\", \"io\" ]", &result)
+	assert.Equal([]string{"ganimed", "io"}, result)
+	assert.Panics(func() { utils.JsonToArrayOfStrings("[ 178 ]", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+	assert.Panics(func() { utils.JsonToArrayOfStrings("true", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+	assert.Panics(func() { utils.JsonToArrayOfStrings("", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+	assert.Panics(func() { utils.JsonToArrayOfStrings("nil", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+	assert.Panics(func() { utils.JsonToArrayOfStrings("\"somestring\"", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+	assert.Panics(func() { utils.JsonToArrayOfStrings("'somestring'", &result) }, "Should panic if converting not a JSON-encoded array of strings!")
+}
+
+/* ---------------------------------------------------------------- *
+ * TESTCASE Min2, Max2, MinList, MaxList, SumList
  * ---------------------------------------------------------------- */
 
 func TestMin(test *testing.T) {
@@ -23,6 +44,7 @@ func TestMin(test *testing.T) {
 	assert.Equal(50, utils.MinList([]int{50}))
 	assert.Equal(1, utils.MinList([]int{50, 1}))
 	assert.Equal(2, utils.MinList([]int{50, 34, 10, 2, 8, 89}))
+	assert.Panics(func() { utils.MinList([]int{}) }, "Min of list should panic on empty list!")
 }
 
 func TestMax(test *testing.T) {
@@ -32,6 +54,16 @@ func TestMax(test *testing.T) {
 	assert.Equal(50, utils.MaxList([]int{50}))
 	assert.Equal(50, utils.MaxList([]int{50, 1}))
 	assert.Equal(89, utils.MaxList([]int{50, 34, 10, 2, 8, 89}))
+	assert.Panics(func() { utils.MaxList([]int{}) }, "Max of list should panic on empty list!")
+}
+
+func TestSumList(test *testing.T) {
+	var assert = assert.New(test)
+	assert.Equal(0, utils.SumList([]int{}), "Sum of empty list should be 0.")
+	assert.Equal(2198, utils.SumList([]int{2198}))
+	assert.Equal(15, utils.SumList([]int{0, 1, 2, 3, 4, 5}))
+	assert.Equal(1038, utils.SumList([]int{1000, 1, 37}))
+	assert.Equal(237, utils.SumList([]int{1000, -800, 37}))
 }
 
 /* ---------------------------------------------------------------- *