Fix SimpleMM test

api-webapp/src/main/kotlin/org/jeudego/pairgoth/store/MemoryStore.kt

@@ -2,10 +2,19 @@ package org.jeudego.pairgoth.store
 
 import org.jeudego.pairgoth.model.ID
 import org.jeudego.pairgoth.model.Tournament
+import java.util.concurrent.atomic.AtomicInteger
 
-class MemoryStore: Store {
+object MemoryStore: Store {
     private val tournaments = mutableMapOf<ID, Tournament<*>>()
 
+    // for tests
+    fun reset() {
+        tournaments.clear()
+        _nextTournamentId.set(0)
+        _nextPlayerId.set(0)
+       _nextGameId.set(0)
+    }
+
     override fun getTournaments(): Map<ID, Map<String, String>> = tournaments.mapValues {
         mapOf("name" to it.value.shortName)
     }

api-webapp/src/main/kotlin/org/jeudego/pairgoth/store/Store.kt

@@ -28,14 +28,12 @@ interface Store {
     fun deleteTournament(tournament: Tournament<*>)
 }
 
-private val memoryStore: Store = MemoryStore()
-
 fun getStore(request: HttpServletRequest): Store {
     val storeType = WebappManager.getMandatoryProperty("store")
     return when (val auth = WebappManager.getMandatoryProperty("auth")) {
         "none", "sesame" ->
             when (storeType) {
-                "memory" -> memoryStore
+                "memory" -> MemoryStore
                 "file" -> {
                     val filePath = WebappManager.properties.getProperty("store.file.path") ?: "."
                     FileStore(filePath)