Fixes

src/main/kotlin/nl/astraeus/persistence/TransactionLog.kt

@@ -4,49 +4,51 @@ import java.io.File
 import java.io.ObjectInputStream
 
 class TransactionLog(
-  val directory: File,
+  directory: File,
 ) {
   val fileManager = FileManager(directory)
 
-  fun showTransactions() {
+  fun showTransactions(printer: (String) -> Unit = ::println) {
     fileManager.findLastSnapshot().let { (after, snapshot) ->
-      println("Last snapshot: $snapshot")
+      printer("Last snapshot: $snapshot")
 
-      println("Snapshot:")
+      printer("Snapshot:")
       snapshot?.inputStream()?.use { input ->
         ObjectInputStream(input).use { ois ->
           val versionNumber = ois.readInt()
-          check(versionNumber == 1) { "Unsupported version number: $versionNumber" }
+          check(versionNumber == 1) {
+            "Unsupported version number: $versionNumber"
+          }
           val transactionNumber = ois.readLong()
-          println("[$versionNumber]  $transactionNumber")
+          printer("[$versionNumber]  $transactionNumber")
           val data = ois.readObject() as MutableMap<Class<*>, TypeData>
-          println("Data:")
-          println("\tClasses:")
+          printer("Data:")
+          printer("\tClasses:")
           for ((cls, entries) in  data.entries) {
-            println("\t\t- $cls: ${entries.data.keys.size}")
+            printer("\t\t- $cls: ${entries.data.keys.size}")
           }
         }
       }
 
       val transactions = fileManager.findTransactionsAfter(after ?: 0L)
 
-      println("Transactions:")
+      printer("Transactions:")
       transactions?.forEach { transaction ->
         transaction.inputStream().use { input ->
           ObjectInputStream(input).use { ois ->
             val versionNumber = ois.readInt()
-            check(versionNumber == 1) { "Unsupported version number: $versionNumber" }
+            check(versionNumber == 1) {
+              "Unsupported version number: $versionNumber"
+            }
             val transactionNumber = ois.readLong()
             val actions = ois.readObject() as Set<Action>
-            println("\t[$transactionNumber]")
+            printer("\t[$transactionNumber]")
             for (action in actions) {
-              println("\t\t- $action")
+              printer("\t\t- $action")
             }
           }
         }
       }
     }
-
   }
-
-}
+}