test: add metadata node testcase to dagreader.go

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

unixfs/io/dagreader_test.go

@@ -3,6 +3,7 @@ package io
 import (
 	"io/ioutil"
 	"os"
+	"strings"
 	"testing"
 
 	mdag "github.com/ipfs/go-ipfs/merkledag"
@@ -154,7 +155,46 @@ func TestBadPBData(t *testing.T) {
 	if err == nil {
 		t.Fatal("excepted error, got nil")
 	}
+}
+
+func TestMetadataNode(t *testing.T) {
+	dserv := testu.GetDAGServ()
+	rdata, rnode := testu.GetRandomNode(t, dserv, 512)
+	_, err := dserv.Add(rnode)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ctx, closer := context.WithCancel(context.Background())
+	defer closer()
 
+	data, err := unixfs.BytesForMetadata(&unixfs.Metadata{"text", 125})
+	if err != nil {
+		t.Fatal(err)
+	}
+	node := mdag.NodeWithData(data)
+
+	_, err = NewDagReader(ctx, node, dserv)
+	if err == nil {
+		t.Fatal("expected an error")
+	}
+	if !strings.Contains(err.Error(), "incorrectly formatted") {
+		t.Fatal("expected different error")
+	}
+
+	node.AddNodeLink("", rnode)
+
+	reader, err := NewDagReader(ctx, node, dserv)
+	if err != nil {
+		t.Fatal(err)
+	}
+	readdata, err := ioutil.ReadAll(reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := testu.ArrComp(rdata, readdata); err != nil {
+		t.Fatal(err)
+	}
 }
 
 func readByte(t testing.TB, reader *DagReader) byte {