abci: implement finalize block (#9468)

Adds the `FinalizeBlock` method which replaces `BeginBlock`, `DeliverTx`, and `EndBlock` in a single call.

blocksync/reactor_test.go

@@ -63,7 +63,7 @@ func newReactor(
 		panic("only support one validator")
 	}
 
-	app := &testApp{}
+	app := abci.NewBaseApplication()
 	cc := proxy.NewLocalClientCreator(app)
 	proxyApp := proxy.NewAppConns(cc, proxy.NopMetrics())
 	err := proxyApp.Start()
@@ -297,37 +297,3 @@ func TestBadBlockStopsPeer(t *testing.T) {
 
 	assert.True(t, lastReactorPair.reactor.Switch.Peers().Size() < len(reactorPairs)-1)
 }
-
-type testApp struct {
-	abci.BaseApplication
-}
-
-var _ abci.Application = (*testApp)(nil)
-
-func (app *testApp) Info(req abci.RequestInfo) (resInfo abci.ResponseInfo) {
-	return abci.ResponseInfo{}
-}
-
-func (app *testApp) BeginBlock(req abci.RequestBeginBlock) abci.ResponseBeginBlock {
-	return abci.ResponseBeginBlock{}
-}
-
-func (app *testApp) EndBlock(req abci.RequestEndBlock) abci.ResponseEndBlock {
-	return abci.ResponseEndBlock{}
-}
-
-func (app *testApp) DeliverTx(req abci.RequestDeliverTx) abci.ResponseDeliverTx {
-	return abci.ResponseDeliverTx{Events: []abci.Event{}}
-}
-
-func (app *testApp) CheckTx(req abci.RequestCheckTx) abci.ResponseCheckTx {
-	return abci.ResponseCheckTx{}
-}
-
-func (app *testApp) Commit() abci.ResponseCommit {
-	return abci.ResponseCommit{}
-}
-
-func (app *testApp) Query(reqQuery abci.RequestQuery) (resQuery abci.ResponseQuery) {
-	return
-}