Adds a first test in BlockchainReaderSpec

src/test/scala/io/iohk/ethereum/domain/BlockchainReaderSpec.scala

@@ -0,0 +1,19 @@
+package io.iohk.ethereum.domain
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+import io.iohk.ethereum.Fixtures
+import io.iohk.ethereum.blockchain.sync.EphemBlockchainTestSetup
+
+class BlockchainReaderSpec extends AnyFlatSpec with Matchers {
+
+  "BlockchainReader" should "be able to get the best block after it was stored by BlockchainWriter" in new EphemBlockchainTestSetup {
+    val validBlock = Fixtures.Blocks.ValidBlock.block
+
+    blockchainWriter.save(validBlock, Nil, ChainWeight.zero, true)
+
+    blockchainReader.getBestBlock() shouldBe Some(validBlock)
+  }
+
+}