Add missing files

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

chain/beacon/drand/drand_test.go

@@ -0,0 +1,14 @@
+package drand
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestPrintDrandPubkey(t *testing.T) {
+	bc, err := NewDrandBeacon(1, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Printf("Drand Pubkey:\n%#v\n", bc.pubkey.TOML())
+}

node/modules/testing/beacon.go

@@ -0,0 +1,12 @@
+package testing
+
+import (
+	"time"
+
+	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/beacon"
+)
+
+func RandomBeacon() (beacon.RandomBeacon, error) {
+	return beacon.NewMockBeacon(build.BlockDelay * time.Second), nil
+}