Add tests

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/GameRow.kt

@@ -1,6 +1,5 @@
 package ch.dissem.yaep.domain
 
-@Suppress("JavaDefaultMethodsNotOverriddenByDelegation")
 class GameRow<C : ItemClass<C>>(
     val category: ItemClassCompanion<C>,
     val options: List<Item<C>>,
@@ -22,12 +21,8 @@ class GameRow<C : ItemClass<C>>(
     fun indexOf(element: C): Int = indexOfFirst { it.selection?.itemType == element }
 
     fun cleanupOptions() {
-        if (isSolved && all {
-                it.solution != null
-                        && it.options.size == 1
-                        && it.options.single() == it.selection
-            }
-        ) return
+        if (isSolved && all { it.options.size == 1 && it.options.single() == it.selection })
+            return
         do {
             var changed = false
             val selections = filter { it.selection != null }.let { cellsWithSelection ->
@@ -58,11 +53,7 @@ class GameRow<C : ItemClass<C>>(
                     }
             }
         } while (changed)
-        isSolved = all {
-            it.solution != null
-                    && it.options.size == 1
-                    && it.options.single() == it.selection
-        }
+        isSolved = all { it.options.size == 1 && it.options.single() == it.selection }
     }
 
     fun snapshot() {
@@ -72,11 +63,7 @@ class GameRow<C : ItemClass<C>>(
     fun undo(): Boolean {
         val didChange = cells.map { it.undo() }.reduce { a, b -> a || b }
         if (didChange) {
-            isSolved = all {
-                it.solution != null
-                        && it.options.size == 1
-                        && it.options.single() == it.selection
-            }
+            isSolved = all { it.options.size == 1 && it.options.single() == it.selection }
         }
         return didChange
     }