Checkstyle and tests

commands1_input.txt

@@ -6,3 +6,5 @@ list-resources I can buy
 reset
 reset the game
 rollD8 5
+start creating,good,task,specifications,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a
+start with,less,cards

commands1_output.txt

@@ -6,3 +6,5 @@ Error, invalid list-resources argument: none expected
 OK
 Error, invalid reset argument: none expected
 Error, not expecting dice roll
+Error, invalid start argument value(s)
+Error, invalid start arguments

src/edu/kit/informatik/model/CardGame.java

@@ -8,6 +8,7 @@ import java.util.Arrays;
 import java.util.Deque;
 import java.util.List;
 import java.util.Objects;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import static edu.kit.informatik.model.Item.AXE;
@@ -105,7 +106,7 @@ public class CardGame {
         if (canBuild(item)) {
             // remove used resources
             for (Card resource : item.resourcesNeeded()) {
-                assert(resources.removeLastOccurrence(resource)); // TODO: remove assert
+                assert resources.removeLastOccurrence(resource); // TODO: remove assert
             }
             items.add(item);
             if (item.equals(STEAMBOAT) || item.equals(BALLOON)) {
@@ -146,8 +147,8 @@ public class CardGame {
         return new ArrayList<>(items);
     }
 
-    public List<Item> getBuildableItems() {
+    public Set<Item> getBuildableItems() {
-        return Arrays.stream(Item.values()).filter(this::canBuild).collect(Collectors.toList());
+        return Arrays.stream(Item.values()).filter(this::canBuild).collect(Collectors.toSet());
     }
 
     public void reset() {

src/edu/kit/informatik/ui/command/Buildable.java

@@ -6,19 +6,18 @@ import edu.kit.informatik.model.Item;
 import edu.kit.informatik.ui.InvalidInputException;
 
 import java.util.Comparator;
-import java.util.List;
+import java.util.Set;
 
 import static edu.kit.informatik.ui.command.CommandFactory.BUILDABLE;
 
 public class Buildable extends Command {
     @Override
     public void apply(CardGame game) {
-        List<Item> buildable = game.getBuildableItems();
+        Set<Item> buildable = game.getBuildableItems();
         if (buildable.isEmpty()) {
             Terminal.printLine("EMPTY");
         } else {
-            buildable.sort(Comparator.comparing(Object::toString));
+            buildable.stream().sorted(Comparator.comparing(Object::toString)).forEach(Terminal::printLine);
-            buildable.forEach(Terminal::printLine);
         }
     }
 

src/edu/kit/informatik/ui/command/ListBuildings.java

@@ -11,7 +11,7 @@ import static edu.kit.informatik.ui.command.CommandFactory.LIST_BUILDINGS;
 
 public class ListBuildings extends Command {
     @Override
-    public void apply(CardGame game) throws InvalidInputException {
+    public void apply(CardGame game) {
         List<Item> items = game.getItems();
         if (items.isEmpty()) {
             Terminal.printLine("EMPTY");

src/edu/kit/informatik/ui/command/ListResources.java

@@ -11,7 +11,7 @@ import static edu.kit.informatik.ui.command.CommandFactory.LIST_RESOURCES;
 
 public class ListResources extends Command {
     @Override
-    public void apply(CardGame game) throws InvalidInputException {
+    public void apply(CardGame game) {
         Deque<Card> resources = game.getResources();
         if (resources.isEmpty()) {
             Terminal.printLine("EMPTY");

src/edu/kit/informatik/ui/command/Start.java

@@ -6,18 +6,12 @@ import edu.kit.informatik.model.CardGame;
 import edu.kit.informatik.ui.InvalidInputException;
 
 import java.util.ArrayDeque;
-import java.util.Arrays;
 import java.util.Deque;
-import java.util.Objects;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-import static edu.kit.informatik.ui.command.CommandFactory.CARD;
 
 public class Start extends Command {
-    private static final Pattern START_ARGUMENTS = Pattern.compile("start ((?:(?:" + CARD + "),){63}(?:" + CARD + "))");
+    private static final Pattern START_ARGUMENTS = Pattern.compile("start ((\\w+,){63}(\\w+))");
 
     private Deque<Card> cards;
 
@@ -39,13 +33,14 @@ public class Start extends Command {
         if (!matcher.matches()) {
             throw new InvalidInputException("invalid start arguments");
         }
-        cards = Arrays.stream(matcher.group(1).split(","))
+        cards = new ArrayDeque<>();
-                .map(Card::parse)
+        for (String s : matcher.group(1).split(",")) {
-                .collect(Collectors.toCollection(ArrayDeque::new));
+            Card card = Card.parse(s);
-        if (cards.stream().anyMatch(Objects::isNull)) {
+            if (card == null) {
-            cards = null;
                 throw new InvalidInputException("invalid start argument value(s)");
             }
+            cards.add(card);
+        }
     }
     /*
     Dieser Befehl ermöglicht es dem Benutzer, ein neues Spiel zu starten. Dieser Befehl kann nur