changes waitForNode to use asserttion

closes  #24

todolist/fxui/src/test/java/todolist/ui/TodoListControllerTest.java

@@ -6,6 +6,7 @@ import java.util.Iterator;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.function.Predicate;
+import static java.time.Duration.ofSeconds;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Node;
 import javafx.scene.Parent;
@@ -14,13 +15,13 @@ import javafx.scene.control.ListView;
 import javafx.stage.Stage;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
 import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.DisabledIfEnvironmentVariable;
-import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.testfx.framework.junit5.ApplicationTest;
 import org.testfx.util.WaitForAsyncUtils;
 import todolist.core.AbstractTodoList;
@@ -157,8 +158,9 @@ public class TodoListControllerTest extends ApplicationTest {
   private Node waitForNode(Predicate<Node> nodeTest, int num) {
     WaitForAsyncUtils.waitForFxEvents();
     Node[] nodes = new Node[1];
-    try {
-      WaitForAsyncUtils.waitFor(2000, TimeUnit.MILLISECONDS,
+    boolean nodeFound;
+
+    nodeFound = assertTimeoutPreemptively(ofSeconds(2), 
           () -> {
             while (true) {
               if ((nodes[0] = findNode(nodeTest, num)) != null) {
@@ -166,11 +168,9 @@ public class TodoListControllerTest extends ApplicationTest {
               }
               Thread.sleep(100);
             }
-          }
+          }, 
+          "No appropriate node available"
         );
-    } catch (TimeoutException e) {
-      fail("No appropriate node available");
-    }
     return nodes[0];
   }