tests: add testutils for integration testing (#132)

* tests: add testutils for integration testing

* update util

* fix config

* more updates

* rand chain-id

* add rpc client integration test example

* makefile

* rename

* updates to makefile

tests/e2e/integration_test.go

@@ -0,0 +1,55 @@
+package e2e
+
+import (
+	"context"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/stretchr/testify/suite"
+
+	"github.com/tharsis/ethermint/testutil/network"
+	ethermint "github.com/tharsis/ethermint/types"
+)
+
+type IntegrationTestSuite struct {
+	suite.Suite
+
+	ctx     context.Context
+	cfg     network.Config
+	network *network.Network
+}
+
+func (s *IntegrationTestSuite) SetupSuite() {
+	s.T().Log("setting up integration test suite")
+
+	cfg := network.DefaultConfig()
+	cfg.NumValidators = 1
+
+	s.ctx = context.Background()
+	s.cfg = cfg
+	s.network = network.New(s.T(), cfg)
+	s.Require().NotNil(s.network)
+
+	_, err := s.network.WaitForHeight(1)
+	s.Require().NoError(err)
+
+	cl, err := ethclient.Dial(s.network.Validators[0].JSONRPCAddress)
+	s.Require().NoError(err, "failed to dial JSON-RPC at %s", s.network.Validators[0].JSONRPCAddress)
+	s.network.Validators[0].JSONRPCClient = cl
+}
+
+func (s *IntegrationTestSuite) TestChainID() {
+	chainID, err := s.network.Validators[0].JSONRPCClient.ChainID(s.ctx)
+	s.Require().NoError(err)
+	s.Require().NotNil(chainID)
+
+	s.T().Log(chainID.Int64())
+
+	eip155ChainID, err := ethermint.ParseChainID(s.network.Config.ChainID)
+	s.Require().NoError(err)
+	s.Require().Equal(chainID, eip155ChainID)
+}
+
+func TestIntegrationTestSuite(t *testing.T) {
+	suite.Run(t, new(IntegrationTestSuite))
+}