diff -r 627e1c99bcf1 -r a95423d37588 src/test/java/de/uapcore/sudoku/MainMenuTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/java/de/uapcore/sudoku/MainMenuTest.java	Tue Jul 28 13:48:59 2020 +0200
@@ -0,0 +1,97 @@
+package de.uapcore.sudoku;
+
+import org.junit.jupiter.api.Test;
+
+import javax.swing.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+class MainMenuTest {
+
+    private final ActionHandler actionHandler = new ActionHandler(new Field());
+
+    private void testListeners(JMenuItem m) {
+        final var listeners = m.getActionListeners();
+        assertEquals(1, listeners.length);
+        assertEquals(actionHandler, listeners[0]);
+    }
+
+    @Test
+    void testStructure() {
+        final var menu = new MainMenu(actionHandler);
+
+        assertEquals(2, menu.getMenuCount());
+
+        final var datei = menu.getMenu(0);
+        assertEquals('D', datei.getMnemonic());
+        assertEquals(9, datei.getItemCount());
+        {
+            final var item = datei.getItem(0);
+            assertEquals("Neu", item.getText());
+            assertEquals('N', item.getMnemonic());
+            assertEquals(1, item.getRegisteredKeyStrokes().length);
+            assertEquals(KeyStroke.getKeyStroke("control N"), item.getRegisteredKeyStrokes()[0]);
+            testListeners(item);
+        }
+        {
+            final var item = datei.getItem(1);
+            assertEquals("Öffnen", item.getText());
+            assertEquals('F', item.getMnemonic());
+            assertEquals(1, item.getRegisteredKeyStrokes().length);
+            assertEquals(KeyStroke.getKeyStroke("control O"), item.getRegisteredKeyStrokes()[0]);
+            testListeners(item);
+        }
+        {
+            final var item = datei.getItem(2);
+            assertEquals("Speichern", item.getText());
+            assertEquals('S', item.getMnemonic());
+            assertEquals(1, item.getRegisteredKeyStrokes().length);
+            assertEquals(KeyStroke.getKeyStroke("control S"), item.getRegisteredKeyStrokes()[0]);
+            testListeners(item);
+        }
+        {
+            final var item = datei.getItem(3);
+            assertEquals("Speichern als...", item.getText());
+            assertEquals('A', item.getMnemonic());
+            testListeners(item);
+        }
+
+        assertNull(datei.getItem(4));
+        {
+            final var item = datei.getItem(5);
+            assertEquals("Prüfen", item.getText());
+            assertEquals('P', item.getMnemonic());
+            assertEquals(1, item.getRegisteredKeyStrokes().length);
+            assertEquals(KeyStroke.getKeyStroke("control P"), item.getRegisteredKeyStrokes()[0]);
+            testListeners(item);
+        }
+        {
+            final var item = datei.getItem(6);
+            assertEquals("Lösen", item.getText());
+            assertEquals('L', item.getMnemonic());
+            assertEquals(1, item.getRegisteredKeyStrokes().length);
+            assertEquals(KeyStroke.getKeyStroke("control L"), item.getRegisteredKeyStrokes()[0]);
+            testListeners(item);
+        }
+        assertNull(datei.getItem(7));
+        {
+            final var item = datei.getItem(8);
+            assertEquals("Beenden", item.getText());
+            assertEquals('E', item.getMnemonic());
+            testListeners(item);
+        }
+
+        final var info = menu.getMenu(1);
+        assertEquals("Info", info.getText());
+        assertEquals('I', info.getMnemonic());
+
+        assertEquals(1, info.getItemCount());
+        final var about = info.getItem(0);
+        assertEquals("Über...", about.getText());
+        assertEquals('B', about.getMnemonic());
+        assertEquals(1, about.getRegisteredKeyStrokes().length);
+        assertEquals(KeyStroke.getKeyStroke("F1"), about.getRegisteredKeyStrokes()[0]);
+        testListeners(about);
+    }
+}