Remove more unnecessary errors in tests.

eraser-base/src/test/java/de/tudresden/inf/st/eraser/ControllingItemTest.java

@@ -6,6 +6,8 @@ import de.tudresden.inf.st.eraser.jastadd.model.*;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.function.Consumer;
+
 /**
  * Testing the simple rule engine.
  *
@@ -61,21 +63,17 @@ public class ControllingItemTest {
 
     Group g = TestUtils.getDefaultGroup(model);
 
-    StringItem stringItem = new StringItem();
-    stringItem.setState("0");
-    initAndAddItem(g, stringItem);
+    StringItem stringItem = initAndAddItem(g, new StringItem(),
+        item -> item.setState("0"));
 
-    SwitchItem booleanItem = new SwitchItem();
-    booleanItem.setState(false);
-    initAndAddItem(g, booleanItem);
+    SwitchItem booleanItem = initAndAddItem(g, new SwitchItem(),
+        item -> item.setState(false));
 
-    ColorItem colorItem = new ColorItem();
-    colorItem.setState(TupleHSB.of(0, 0, 0));
-    initAndAddItem(g, colorItem);
+    ColorItem colorItem = initAndAddItem(g, new ColorItem(),
+        item -> item.setState(TupleHSB.of(0, 0, 0)));
 
-    ColorItem target = new ColorItem();
-    target.setState(TupleHSB.of(0, 0, 0));
-    initAndAddItem(g, target);
+    ColorItem target = initAndAddItem(g, new ColorItem(),
+        item -> item.setState(TupleHSB.of(0, 0, 0)));
 
     target.addControlledBy(numberItem);
     target.addControlledBy(stringItem);
@@ -119,9 +117,11 @@ public class ControllingItemTest {
     Assert.assertEquals("Item was not controlled correctly", TupleHSB.of(33, 33, 44), target.getState());
   }
 
-  private void initAndAddItem(Group group, Item item) {
-    item.enableSendState();
+  private <T extends Item> T initAndAddItem(Group group, T item, Consumer<T> setState) {
     item.setID("item" + group.getNumItem());
     group.addItem(item);
+    setState.accept(item);
+    item.enableSendState();
+    return item;
   }
 }