From 581ec195b73ce6dc4fb68f8c50bd8b9e3563276e Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 27 Mar 2026 15:58:28 +0200
Subject: Fix CLI replay startup on EDT

---
 src/test/java/simulator/VSMainTest.java | 54 +++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'src/test/java/simulator')

diff --git a/src/test/java/simulator/VSMainTest.java b/src/test/java/simulator/VSMainTest.java
index 5d4fb8b..8f4bffc 100644
--- a/src/test/java/simulator/VSMainTest.java
+++ b/src/test/java/simulator/VSMainTest.java
@@ -1,10 +1,22 @@
 package simulator;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+
+import java.awt.Component;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
 
 import org.junit.jupiter.api.Test;
 
+import prefs.VSDefaultPrefs;
+import prefs.VSPrefs;
+
 public class VSMainTest {
     @Test
     void resolveStartupSimulationFileReturnsNullForMissingArgs() {
@@ -24,4 +36,46 @@ public class VSMainTest {
                          new String[] {"  saved-simulations/raft.dat  ",
                                        "ignored"}));
     }
+
+    @Test
+    void runOnEventDispatchThreadExecutesOnSwingEdt() {
+        AtomicBoolean ranOnEdt = new AtomicBoolean(false);
+
+        VSMain.runOnEventDispatchThread(new Runnable() {
+            public void run() {
+                ranOnEdt.set(javax.swing.SwingUtilities
+                             .isEventDispatchThread());
+            }
+        });
+
+        assertTrue(ranOnEdt.get());
+    }
+
+    @Test
+    void launchSimulatorFrameCreatesAndStartsOnSwingEdt() {
+        VSPrefs prefs = VSDefaultPrefs.init();
+        AtomicBoolean createdOnEdt = new AtomicBoolean(false);
+        AtomicReference<String> openedFilename = new AtomicReference<String>();
+        VSSimulatorFrame frame = mock(VSSimulatorFrame.class);
+        doAnswer(invocation -> {
+            openedFilename.set(invocation.getArgument(0, String.class));
+            return null;
+        }).when(frame).openAndStartSimulator("saved-simulations/raft.dat");
+
+        VSSimulatorFrame launchedFrame = VSMain.launchSimulatorFrame(
+            prefs, null, "saved-simulations/raft.dat",
+            new VSMain.SimulatorFrameFactory() {
+                public VSSimulatorFrame create(VSPrefs framePrefs,
+                                               Component relativeTo) {
+                    createdOnEdt.set(javax.swing.SwingUtilities
+                                     .isEventDispatchThread());
+                    return frame;
+                }
+            });
+
+        assertTrue(createdOnEdt.get());
+        assertNotNull(launchedFrame);
+        assertSame(frame, launchedFrame);
+        assertEquals("saved-simulations/raft.dat", openedFilename.get());
+    }
 }
-- 
cgit v1.2.3