Add integration test

* Update Travis to run integration tests

integration_test/geth_blockchain_test.go

@@ -0,0 +1,51 @@
+package integration_test
+
+import (
+	"fmt"
+	"github.com/8thlight/vulcanizedb/core"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"math/big"
+	"path"
+	"path/filepath"
+	"runtime"
+)
+
+var (
+	_, filename, _, _ = runtime.Caller(0)
+	basepath          = filepath.Dir(filename)
+)
+
+func RunTimePath() string {
+	return path.Join(path.Dir(filename), "../")
+}
+
+type ObserverWithChannel struct {
+	blocks chan core.Block
+}
+
+func (observer *ObserverWithChannel) NotifyBlockAdded(block core.Block) {
+	fmt.Println("Block: ", block.Number)
+	observer.blocks <- block
+}
+
+var _ = Describe("Reading from the Geth blockchain", func() {
+
+	It("reads two blocks with incrementing numbers", func(done Done) {
+		addedBlock := make(chan core.Block, 10)
+		observer := &ObserverWithChannel{addedBlock}
+
+		var blockchain core.Blockchain = core.NewGethBlockchain(RunTimePath() + "/test_data_dir/geth.ipc")
+		blockchain.RegisterObserver(observer)
+
+		go blockchain.SubscribeToEvents()
+
+		firstBlock := <-addedBlock
+		Expect(firstBlock).ShouldNot(BeNil())
+		secondBlock := <-addedBlock
+		Expect(firstBlock.Number.Add(firstBlock.Number, big.NewInt(1))).Should(Equal(secondBlock.Number))
+
+		close(done)
+	}, 30)
+
+})

integration_test/integration_test_suite_test.go

@@ -0,0 +1,13 @@
+package integration_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestIntegrationTest(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "IntegrationTest Suite")
+}