fix: use context.Background() instead of nil

bitswap.go

@@ -273,7 +273,7 @@ func (bs *Bitswap) GetBlocks(ctx context.Context, keys []cid.Cid) (<-chan blocks
 // HasBlock announces the existence of a block to this bitswap service. The
 // service will potentially notify its peers.
 func (bs *Bitswap) HasBlock(blk blocks.Block) error {
-	return bs.receiveBlocksFrom(nil, "", []blocks.Block{blk})
+	return bs.receiveBlocksFrom(context.Background(), "", []blocks.Block{blk})
 }
 
 // TODO: Some of this stuff really only needs to be done when adding a block

sessionmanager/sessionmanager_test.go

@@ -180,7 +180,9 @@ func TestInterestedIn(t *testing.T) {
 	ctx := context.Background()
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
-	sm := New(ctx, sessionFactory, peerManagerFactory, requestSplitterFactory)
+	notif := notifications.New()
+	defer notif.Shutdown()
+	sm := New(ctx, sessionFactory, peerManagerFactory, requestSplitterFactory, notif)
 
 	blks := testutil.GenerateBlocksOfSize(4, 1024)
 	var cids []cid.Cid