downloader: fixed tests with low ttl

eth/downloader/downloader.go

@@ -20,12 +20,12 @@ import (
 const (
 	maxBlockFetch    = 256              // Amount of max blocks to be fetched per chunk
 	peerCountTimeout = 12 * time.Second // Amount of time it takes for the peer handler to ignore minDesiredPeerCount
-	blockTtl         = 20 * time.Second // The amount of time it takes for a block request to time out
 	hashTtl          = 20 * time.Second // The amount of time it takes for a hash request to time out
 )
 
 var (
 	minDesiredPeerCount = 5                // Amount of peers desired to start syncing
+	blockTtl            = 20 * time.Second // The amount of time it takes for a block request to time out
 
 	errLowTd            = errors.New("peer's TD is too low")
 	errBusy             = errors.New("busy")

eth/downloader/downloader_test.go

@@ -110,6 +110,7 @@ func TestDownload(t *testing.T) {
 	glog.SetToStderr(true)
 
 	minDesiredPeerCount = 4
+	blockTtl = 1 * time.Second
 
 	hashes := createHashes(0, 1000)
 	blocks := createBlocksFromHashes(hashes)