test: add unit test for Keys and Values func

maputil/map.go

@@ -6,7 +6,7 @@ package maputil
 
 // Keys returns a slice of the map's keys
 func Keys[K comparable, V any](m map[K]V) []K {
-	keys := make([]K, len(m))
+	keys := make([]K, 0, len(m))
 
 	for k := range m {
 		keys = append(keys, k)
@@ -17,7 +17,7 @@ func Keys[K comparable, V any](m map[K]V) []K {
 
 // Values returns a slice of the map's values
 func Values[K comparable, V any](m map[K]V) []V {
-	values := make([]V, len(m))
+	values := make([]V, 0, len(m))
 
 	for _, v := range m {
 		values = append(values, v)

maputil/map_test.go

@@ -0,0 +1,42 @@
+package maputil
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/duke-git/lancet/v2/internal"
+)
+
+func TestKeys(t *testing.T) {
+	assert := internal.NewAssert(t, "TestKeys")
+
+	m := map[int]string{
+		1: "a",
+		2: "a",
+		3: "b",
+		4: "c",
+		5: "d",
+	}
+
+	keys := Keys(m)
+	sort.Ints(keys)
+
+	assert.Equal([]int{1, 2, 3, 4, 5}, keys)
+}
+
+func TestValues(t *testing.T) {
+	assert := internal.NewAssert(t, "TestValues")
+
+	m := map[int]string{
+		1: "a",
+		2: "a",
+		3: "b",
+		4: "c",
+		5: "d",
+	}
+
+	values := Values(m)
+	sort.Strings(values)
+
+	assert.Equal([]string{"a", "a", "b", "c", "d"}, values)
+}