Nest packages under pkg

pkg/fakes/blockchain_observer.go

@@ -0,0 +1,23 @@
+package fakes
+
+import "github.com/8thlight/vulcanizedb/pkg/core"
+
+type BlockchainObserver struct {
+	CurrentBlocks []core.Block
+	WasNotified   chan bool
+}
+
+func (observer *BlockchainObserver) LastBlock() core.Block {
+	return observer.CurrentBlocks[len(observer.CurrentBlocks)-1]
+}
+
+func NewFakeBlockchainObserver() *BlockchainObserver {
+	return &BlockchainObserver{
+		WasNotified: make(chan bool),
+	}
+}
+
+func (observer *BlockchainObserver) NotifyBlockAdded(block core.Block) {
+	observer.CurrentBlocks = append(observer.CurrentBlocks, block)
+	observer.WasNotified <- true
+}