Modify DA Test to use SubmitBlocks with multiple blocks (cosmos#1085)

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## Overview
Closes: cosmos#1086 

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- [x] New and updated code has appropriate documentation
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---------

Co-authored-by: Ganesha Upadhyaya <gupadhyaya@Ganeshas-MacBook-Pro-2.local>

da/celestia/mock/server.go

@@ -208,20 +208,24 @@ func (s *Server) rpc(w http.ResponseWriter, r *http.Request) {
 			s.writeError(w, errors.New("expected 3 params: fee (uint64), gaslimit (uint64), data (base64 string)"))
 			return
 		}
-		block := types.Block{}
-		blockBase64 := params[2].([]interface{})[0].(map[string]interface{})["data"].(string)
-		blockData, err := base64.StdEncoding.DecodeString(blockBase64)
-		if err != nil {
-			s.writeError(w, err)
-			return
-		}
-		err = block.UnmarshalBinary(blockData)
-		if err != nil {
-			s.writeError(w, err)
-			return
+
+		blocks := make([]*types.Block, len(params[2].([]interface{})))
+		for i, data := range params[2].([]interface{}) {
+			blockBase64 := data.(map[string]interface{})["data"].(string)
+			blockData, err := base64.StdEncoding.DecodeString(blockBase64)
+			if err != nil {
+				s.writeError(w, err)
+				return
+			}
+			blocks[i] = new(types.Block)
+			err = blocks[i].UnmarshalBinary(blockData)
+			if err != nil {
+				s.writeError(w, err)
+				return
+			}
 		}
 
-		res := s.mock.SubmitBlocks(r.Context(), []*types.Block{&block})
+		res := s.mock.SubmitBlocks(r.Context(), blocks)
 		resp := &response{
 			Jsonrpc: "2.0",
 			Result: &sdk.TxResponse{

da/test/da_test.go

@@ -161,16 +161,23 @@ func doTestRetrieve(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 
 	retriever := dalc.(da.BlockRetriever)
 	countAtHeight := make(map[uint64]int)
-	blocks := make(map[*types.Block]uint64)
-
-	for i := uint64(0); i < 100; i++ {
-		b := getRandomBlock(i, rand.Int()%20) //nolint:gosec
-		resp := dalc.SubmitBlocks(ctx, []*types.Block{b})
+	blockToDAHeight := make(map[*types.Block]uint64)
+	numBatches := uint64(10)
+	blocksSubmittedPerBatch := 10
+
+	for i := uint64(0); i < numBatches; i++ {
+		blocks := make([]*types.Block, blocksSubmittedPerBatch)
+		for j := 0; j < len(blocks); j++ {
+			blocks[j] = getRandomBlock(i*numBatches+uint64(j), rand.Int()%20) //nolint:gosec
+		}
+		resp := dalc.SubmitBlocks(ctx, blocks)
 		assert.Equal(da.StatusSuccess, resp.Code, resp.Message)
 		time.Sleep(time.Duration(rand.Int63() % mockDaBlockTime.Milliseconds())) //nolint:gosec
 
-		countAtHeight[resp.DAHeight]++
-		blocks[b] = resp.DAHeight
+		for _, b := range blocks {
+			blockToDAHeight[b] = resp.DAHeight
+			countAtHeight[resp.DAHeight]++
+		}
 	}
 
 	// wait a bit more than mockDaBlockTime, so mock can "produce" last blocks
@@ -181,10 +188,11 @@ func doTestRetrieve(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 		ret := retriever.RetrieveBlocks(ctx, h)
 		assert.Equal(da.StatusSuccess, ret.Code, ret.Message)
 		require.NotEmpty(ret.Blocks, h)
+		assert.Equal(cnt%blocksSubmittedPerBatch, 0)
 		assert.Len(ret.Blocks, cnt, h)
 	}
 
-	for b, h := range blocks {
+	for b, h := range blockToDAHeight {
 		ret := retriever.RetrieveBlocks(ctx, h)
 		assert.Equal(da.StatusSuccess, ret.Code, h)
 		require.NotEmpty(ret.Blocks, h)

types/serialization.go

@@ -47,6 +47,17 @@ func (d *Data) MarshalBinary() ([]byte, error) {
 	return d.ToProto().Marshal()
 }
 
+// UnmarshalBinary decodes binary form of Data into object.
+func (d *Data) UnmarshalBinary(data []byte) error {
+	var pData pb.Data
+	err := pData.Unmarshal(data)
+	if err != nil {
+		return err
+	}
+	err = d.FromProto(&pData)
+	return err
+}
+
 // MarshalBinary encodes Commit into binary form and returns it.
 func (c *Commit) MarshalBinary() ([]byte, error) {
 	return c.ToProto().Marshal()
@@ -192,10 +203,20 @@ func (b *Block) FromProto(other *pb.Block) error {
 	if err != nil {
 		return err
 	}
-	b.Data.Txs = byteSlicesToTxs(other.Data.Txs)
-	b.Data.IntermediateStateRoots.RawRootsList = other.Data.IntermediateStateRoots
+	err = b.Data.FromProto(other.Data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// FromProto fills the Data with data from its protobuf representation
+func (d *Data) FromProto(other *pb.Data) error {
+	d.Txs = byteSlicesToTxs(other.Txs)
+	d.IntermediateStateRoots.RawRootsList = other.IntermediateStateRoots
 	// Note: Temporarily remove Evidence #896
-	// b.Data.Evidence = evidenceFromProto(other.Data.Evidence)
+	// d.Evidence = evidenceFromProto(other.Evidence)
 
 	return nil
 }