adding ssz response for get blobs beacon api endpoint (#12611)

network/writer_test.go

@@ -0,0 +1,35 @@
+package network
+
+import (
+	"fmt"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+)
+
+func TestWriteSsz(t *testing.T) {
+	name := "test.ssz"
+	sidecar := &eth.BlobSidecar{
+		BlockRoot:       make([]byte, fieldparams.RootLength),
+		Index:           0,
+		Slot:            0,
+		BlockParentRoot: make([]byte, fieldparams.RootLength),
+		ProposerIndex:   123,
+		Blob:            make([]byte, fieldparams.BlobLength),
+		KzgCommitment:   make([]byte, fieldparams.BLSPubkeyLength),
+		KzgProof:        make([]byte, fieldparams.BLSPubkeyLength),
+	}
+	respSsz, err := sidecar.MarshalSSZ()
+	require.NoError(t, err)
+	writer := httptest.NewRecorder()
+	WriteSsz(writer, respSsz, name)
+	require.Equal(t, writer.Header().Get("Content-Type"), "application/octet-stream")
+	require.Equal(t, true, strings.Contains(writer.Header().Get("Content-Disposition"), name))
+	require.Equal(t, writer.Header().Get("Content-Length"), fmt.Sprintf("%v", len(respSsz)))
+	require.Equal(t, hexutil.Encode(writer.Body.Bytes()), hexutil.Encode(respSsz))
+}