Fix descriptions

Author: AnastasiiaL

src/it/scala/io/iohk/ethereum/ledger/BlockImporterItSpec.scala

@@ -129,7 +129,7 @@ class BlockImporterItSpec extends MockFactory with TestSetupWithVmAndValidators
     blockchain.getBestBlock().get shouldEqual oldBlock4
   }
 
-  it should "return a correct new best block after reorganising longer chain to a shorter one" in {
+  it should "return a correct new best block after reorganising longer chain to a shorter one if its weight is bigger" in {
 
     //returning discarded initial chain
     blockchain.save(oldBlock2, Nil, oldWeight2, saveAsBestBlock = true)
@@ -145,8 +145,8 @@ class BlockImporterItSpec extends MockFactory with TestSetupWithVmAndValidators
 
   it should "switch to a branch with a checkpoint" in {
 
-    val chackpoint = ObjectGenerators.fakeCheckpointGen(3, 3).sample.get
-    val oldBlock5WithCheckpoint: Block = checkpointBlockGenerator.generate(oldBlock4, chackpoint)
+    val checkpoint = ObjectGenerators.fakeCheckpointGen(3, 3).sample.get
+    val oldBlock5WithCheckpoint: Block = checkpointBlockGenerator.generate(oldBlock4, checkpoint)
     blockchain.save(oldBlock5WithCheckpoint, Nil, oldWeight4, saveAsBestBlock = true)
 
     val newBranch = List(newBlock2, newBlock3)
@@ -158,10 +158,10 @@ class BlockImporterItSpec extends MockFactory with TestSetupWithVmAndValidators
     blockchain.getLatestCheckpointBlockNumber() shouldEqual oldBlock5WithCheckpoint.header.number
   }
 
-  it should "return a correct checkpointed block after reorganising longer chain to a shorter one and back" in {
+  it should "switch to a branch with a newer checkpoint" in {
 
-    val chackpoint = ObjectGenerators.fakeCheckpointGen(3, 3).sample.get
-    val newBlock4WithCheckpoint: Block = checkpointBlockGenerator.generate(newBlock3, chackpoint)
+    val checkpoint = ObjectGenerators.fakeCheckpointGen(3, 3).sample.get
+    val newBlock4WithCheckpoint: Block = checkpointBlockGenerator.generate(newBlock3, checkpoint)
     blockchain.save(newBlock4WithCheckpoint, Nil, newWeight3, saveAsBestBlock = true)
 
     val newBranch = List(newBlock4WithCheckpoint)
@@ -173,7 +173,7 @@ class BlockImporterItSpec extends MockFactory with TestSetupWithVmAndValidators
     blockchain.getLatestCheckpointBlockNumber() shouldEqual newBlock4WithCheckpoint.header.number
   }
 
-  it should "return a correct checkpointed block after receiving a new chackpoint from morpho" in {
+  it should "return a correct checkpointed block after receiving a request for generating a new checkpoint" in {
 
     val parent = blockchain.getBestBlock().get
     val newBlock5: Block = getBlock(genesisBlock.number + 5, difficulty = 104, parent = parent.header.hash)

src/main/scala/io/iohk/ethereum/ledger/BlockExecution.scala

@@ -6,9 +6,7 @@ import io.iohk.ethereum.ledger.Ledger.BlockResult
 import io.iohk.ethereum.utils.{BlockchainConfig, DaoForkConfig, Logger}
 import io.iohk.ethereum.vm.EvmConfig
 import scala.annotation.tailrec
-import scala.util.Try
-import akka.util.ByteString
-import io.iohk.ethereum.mpt.MerklePatriciaTrie.MissingNodeException
+import cats.implicits._
 
 class BlockExecution(
     blockchain: BlockchainImpl,
@@ -62,9 +60,8 @@ class BlockExecution(
         .getBlockHeaderByHash(block.header.parentHash)
         .toRight(MissingParentError) // Should not never occur because validated earlier
       execResult <- executeBlockTransactions(block, parent)
-      worldToPersist <- Try {
-        blockPreparator.payBlockReward(block, execResult.worldState)
-      }.toEither.left.map(BlockExecutionError.MPTError(_))
+      worldToPersist <- Either.catchOnly[Throwable](blockPreparator.payBlockReward(block, execResult.worldState))
+      .leftMap(BlockExecutionError.MPTError.apply)
       // State root hash needs to be up-to-date for validateBlockAfterExecution
       worldPersisted = InMemoryWorldStateProxy.persistState(worldToPersist)
     } yield execResult.copy(worldState = worldPersisted)
@@ -174,21 +171,21 @@ sealed trait BlockExecutionError {
 
 sealed trait BlockExecutionSuccess
 
-case object BlockExecutionSuccess extends BlockExecutionSuccess
+final case object BlockExecutionSuccess extends BlockExecutionSuccess
 
 object BlockExecutionError {
-  case class ValidationBeforeExecError(reason: Any) extends BlockExecutionError
+  final case class ValidationBeforeExecError(reason: Any) extends BlockExecutionError
 
-  case class StateBeforeFailure(worldState: InMemoryWorldStateProxy, acumGas: BigInt, acumReceipts: Seq[Receipt])
+  final case class StateBeforeFailure(worldState: InMemoryWorldStateProxy, acumGas: BigInt, acumReceipts: Seq[Receipt])
 
-  case class TxsExecutionError(stx: SignedTransaction, stateBeforeError: StateBeforeFailure, reason: String)
+  final case class TxsExecutionError(stx: SignedTransaction, stateBeforeError: StateBeforeFailure, reason: String)
       extends BlockExecutionError
 
-  case class ValidationAfterExecError(reason: String) extends BlockExecutionError
+  final case class ValidationAfterExecError(reason: String) extends BlockExecutionError
 
-  case object MissingParentError extends BlockExecutionError {
+  final case object MissingParentError extends BlockExecutionError {
     override val reason: Any = "Cannot find parent"
   }
 
-  case class MPTError(reason: Throwable) extends BlockExecutionError
+  final case class MPTError(reason: Throwable) extends BlockExecutionError
 }