test: cli chain getblock command

Unit test for the cli `chain getblock` command.
Tests if output is JSON  in the expected format.

cli/chain.go

@@ -99,6 +99,8 @@ var ChainGetBlock = &cli.Command{
 		},
 	},
 	Action: func(cctx *cli.Context) error {
+		afmt := NewAppFmt(cctx.App)
+
 		api, closer, err := GetFullNodeAPI(cctx)
 		if err != nil {
 			return err
@@ -126,7 +128,7 @@ var ChainGetBlock = &cli.Command{
 				return err
 			}
 
-			fmt.Println(string(out))
+			afmt.Println(string(out))
 			return nil
 		}
 
@@ -165,9 +167,8 @@ var ChainGetBlock = &cli.Command{
 			return err
 		}
 
-		fmt.Println(string(out))
+		afmt.Println(string(out))
 		return nil
-
 	},
 }
 

cli/chain_test.go

@@ -3,13 +3,16 @@ package cli
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"regexp"
 	"testing"
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/api/mocks"
+	types "github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/types/mock"
 	"github.com/golang/mock/gomock"
+	cid "github.com/ipfs/go-cid"
 	"github.com/stretchr/testify/assert"
 	ucli "github.com/urfave/cli/v2"
 )
@@ -52,3 +55,38 @@ func TestChainHead(t *testing.T) {
 
 	assert.Regexp(t, regexp.MustCompile(ts.Cids()[0].String()), buf.String())
 }
+
+// TestGetBlock checks if "lotus chain getblock" returns the block information in the expected format
+func TestGetBlock(t *testing.T) {
+	app, mockApi, buf, done := newMockAppWithFullAPI(t, WithCategory("chain", ChainGetBlock))
+	defer done()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	block := mock.MkBlock(nil, 0, 0)
+	blockMsgs := api.BlockMessages{}
+
+	gomock.InOrder(
+		mockApi.EXPECT().ChainGetBlock(ctx, block.Cid()).Return(block, nil),
+		mockApi.EXPECT().ChainGetBlockMessages(ctx, block.Cid()).Return(&blockMsgs, nil),
+		mockApi.EXPECT().ChainGetParentMessages(ctx, block.Cid()).Return([]api.Message{}, nil),
+		mockApi.EXPECT().ChainGetParentReceipts(ctx, block.Cid()).Return([]*types.MessageReceipt{}, nil),
+	)
+
+	err := app.Run([]string{"chain", "getblock", block.Cid().String()})
+	assert.NoError(t, err)
+
+	out := struct {
+		types.BlockHeader
+		BlsMessages    []*types.Message
+		SecpkMessages  []*types.SignedMessage
+		ParentReceipts []*types.MessageReceipt
+		ParentMessages []cid.Cid
+	}{}
+
+	err = json.Unmarshal(buf.Bytes(), &out)
+	assert.NoError(t, err)
+
+	assert.True(t, block.Cid().Equals(out.Cid()))
+}