test: Add time test

waku/v2/utils/time.go

@@ -2,6 +2,10 @@ package utils
 
 import "time"
 
-func GetUnixEpoch() float64 {
-	return float64(time.Now().UnixNano()) / float64(time.Second)
+func GetUnixEpochFrom(now func() time.Time) float64 {
+	return float64(now().UnixNano()) / float64(time.Second)
+}
+
+func GetUnixEpoch() float64 {
+	return GetUnixEpochFrom(time.Now)
 }

waku/v2/utils/time_test.go

@@ -0,0 +1,18 @@
+package utils
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetUnixEpochFrom(t *testing.T) {
+	loc := time.UTC
+	timeFn := func() time.Time {
+		return time.Date(2019, 1, 1, 0, 0, 0, 0, loc)
+	}
+	timestamp := GetUnixEpochFrom(timeFn)
+
+	require.Equal(t, float64(1546300800), timestamp)
+}