Consolidate test doubles

- Migrate various mocks of core namespaces to shared version in `fakes` pkg
- Err on the side of making test doubles less sophisticated
- Don't pull over mocks of namespaces that are only used in example code

pkg/history/block_validator_test.go

@@ -4,39 +4,29 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/inmemory"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
+	"math/big"
 )
 
 var _ = Describe("Blocks validator", func() {
 
 	It("calls create or update for all blocks within the window", func() {
-		blockchain := fakes.NewMockBlockChainWithBlocks([]core.Block{
-			{Number: 4},
-			{Number: 5},
-			{Number: 6},
-			{Number: 7},
-		})
-		inMemoryDB := inmemory.NewInMemory()
-		blocksRepository := &inmemory.BlockRepository{InMemory: inMemoryDB}
-		validator := history.NewBlockValidator(blockchain, blocksRepository, 2)
+		blockChain := fakes.NewMockBlockChain()
+		blockChain.SetLastBlock(big.NewInt(7))
+		blocksRepository := fakes.NewMockBlockRepository()
+		validator := history.NewBlockValidator(blockChain, blocksRepository, 2)
 
 		window := validator.ValidateBlocks()
 
 		Expect(window).To(Equal(history.ValidationWindow{LowerBound: 5, UpperBound: 7}))
-		Expect(blocksRepository.BlockCount()).To(Equal(3))
-		Expect(blocksRepository.CreateOrUpdateBlockCallCount).To(Equal(3))
+		blocksRepository.AssertCreateOrUpdateBlockCallCountEquals(3)
 	})
 
 	It("returns the number of largest block", func() {
-		blockchain := fakes.NewMockBlockChainWithBlocks([]core.Block{
-			{Number: 1},
-			{Number: 2},
-			{Number: 3},
-		})
-		maxBlockNumber := blockchain.LastBlock()
+		blockChain := fakes.NewMockBlockChain()
+		blockChain.SetLastBlock(big.NewInt(3))
+		maxBlockNumber := blockChain.LastBlock()
 
 		Expect(maxBlockNumber.Int64()).To(Equal(int64(3)))
 	})