test: check if NewWriteThrough is not calling Has

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

blockservice.go

@@ -4,6 +4,7 @@
 package blockservice
 
 import (
+	"context"
 	"errors"
 	"fmt"
 
@@ -11,7 +12,6 @@ import (
 	"github.com/ipfs/go-ipfs/blocks/blockstore"
 	exchange "github.com/ipfs/go-ipfs/exchange"
 
-	context "context"
 	logging "gx/ipfs/QmSpJByNKFX1sCsHBEp3R73FL4NF6FnQTEGyNAXHm2GS52/go-log"
 	cid "gx/ipfs/QmakyCk6Vnn16WEKjbkxieZmM2YLTzkFWizbmGowoYPjro/go-cid"
 )

blockservice_test.go

+package blockservice
+
+import (
+	"testing"
+
+	"github.com/ipfs/go-ipfs/blocks/blockstore"
+	butil "github.com/ipfs/go-ipfs/blocks/blocksutil"
+	offline "github.com/ipfs/go-ipfs/exchange/offline"
+
+	cid "gx/ipfs/QmakyCk6Vnn16WEKjbkxieZmM2YLTzkFWizbmGowoYPjro/go-cid"
+	ds "gx/ipfs/QmbzuUusHqaLLoNTDEVLcSF6vZDHZDLPC7p4bztRvvkXxU/go-datastore"
+	dssync "gx/ipfs/QmbzuUusHqaLLoNTDEVLcSF6vZDHZDLPC7p4bztRvvkXxU/go-datastore/sync"
+)
+
+func TestWriteThroughWorks(t *testing.T) {
+	dstore := dssync.MutexWrap(ds.NewMapDatastore())
+	bstore := HasFailingBlockstore{
+		blockstore.NewBlockstore(dstore),
+		t,
+		true,
+	}
+	exch := offline.Exchange(bstore)
+	bserv := NewWriteThrough(bstore, exch)
+	bgen := butil.NewBlockGenerator()
+
+	bserv.AddBlock(bgen.Next())
+}
+
+var _ blockstore.GCBlockstore = (*HasFailingBlockstore)(nil)
+
+type HasFailingBlockstore struct {
+	blockstore.GCBlockstore
+	t    *testing.T
+	Fail bool
+}
+
+func (bs HasFailingBlockstore) Has(k *cid.Cid) (bool, error) {
+	if bs.Fail {
+		bs.t.Fatal("Has shouldn't be called")
+		return false, nil
+	}
+	return bs.GCBlockstore.Has(k)
+
+}