diff --git a/HellionChat/Plugin.cs b/HellionChat/Plugin.cs
index e271a68..4f987ca 100755
--- a/HellionChat/Plugin.cs
+++ b/HellionChat/Plugin.cs
@@ -344,6 +344,7 @@ public sealed class Plugin : IAsyncDalamudPlugin
                 new SelfTests.SidebarModeAutoSwitchStep(this),
                 new SelfTests.ColorEditorBufferStep(this),
                 new SelfTests.ThemePickerCategoryStep(this),
+                new SelfTests.SettingsWindowOpenStep(this),
                 new SelfTests.ConfigMigrationV20Step(this),
                 new SelfTests.HoverSheenAllocStep(this),
                 new SelfTests.HonorificHeaderRenderStep(this),
diff --git a/HellionChat/SelfTests/SettingsWindowOpenStep.cs b/HellionChat/SelfTests/SettingsWindowOpenStep.cs
new file mode 100644
index 0000000..628dbd2
--- /dev/null
+++ b/HellionChat/SelfTests/SettingsWindowOpenStep.cs
@@ -0,0 +1,37 @@
+using Dalamud.Bindings.ImGui;
+using Dalamud.Plugin.SelfTest;
+
+namespace HellionChat.SelfTests;
+
+internal sealed class SettingsWindowOpenStep : ISelfTestStep
+{
+    private readonly Plugin _plugin;
+
+    public SettingsWindowOpenStep(Plugin plugin)
+    {
+        _plugin = plugin;
+    }
+
+    public string Name => "Hellion Chat - Settings window toggles via direct call";
+
+    public SelfTestStepResult RunStep()
+    {
+        var initial = _plugin.SettingsWindow.IsOpen;
+        _plugin.SettingsWindow.Toggle();
+        var afterFirst = _plugin.SettingsWindow.IsOpen;
+        _plugin.SettingsWindow.Toggle();
+        var afterSecond = _plugin.SettingsWindow.IsOpen;
+
+        if (afterFirst == initial || afterSecond != initial)
+        {
+            ImGui.Text(
+                $"Toggle did not flip state: initial={initial} after1={afterFirst} after2={afterSecond}"
+            );
+            return SelfTestStepResult.Fail;
+        }
+
+        return SelfTestStepResult.Pass;
+    }
+
+    public void CleanUp() { }
+}