diff --git a/backend/LexBoxApi/Controllers/TestingController.cs b/backend/LexBoxApi/Controllers/TestingController.cs
index 07ab00311..98c7cc8f0 100644
--- a/backend/LexBoxApi/Controllers/TestingController.cs
+++ b/backend/LexBoxApi/Controllers/TestingController.cs
@@ -11,7 +11,6 @@
 
 namespace LexBoxApi.Controllers;
 
-#if DEBUG
 [ApiController]
 [Route("/api/[controller]")]
 public class TestingController : ControllerBase
@@ -32,8 +31,7 @@ public TestingController(LexAuthService lexAuthService,
         _redmineDbContext = redmineDbContext;
     }
 
-
-
+#if DEBUG
     [AllowAnonymous]
     [HttpGet("makeJwt")]
     [ProducesResponseType(StatusCodes.Status200OK)]
@@ -98,11 +96,16 @@ public record TestingControllerProject(Guid Id, string Name, string Code, List<T
 
     public record TestingControllerProjectUser(string? Username, string Role, string Email, Guid Id);
 
+#endif
     [HttpGet("throwsException")]
     [AllowAnonymous]
     public ActionResult ThrowsException()
     {
         throw new ExceptionWithCode("This is a test exception", "test-error");
     }
+
+    [HttpGet("test500NoException")]
+    [AllowAnonymous]
+    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
+    public ActionResult Test500NoError() => StatusCode(500);
 }
-#endif
diff --git a/backend/LexBoxApi/Program.cs b/backend/LexBoxApi/Program.cs
index 3730b4309..939e40bb7 100644
--- a/backend/LexBoxApi/Program.cs
+++ b/backend/LexBoxApi/Program.cs
@@ -105,6 +105,7 @@
     context.Response.Headers.Add("lexbox-version", AppVersionService.Version);
     await next();
 });
+app.UseStatusCodePages();
 if (!app.Environment.IsDevelopment())
     app.UseExceptionHandler();
 app.UseHealthChecks("/api/healthz");
diff --git a/backend/Testing/Browser/Page/SandboxPage.cs b/backend/Testing/Browser/Page/SandboxPage.cs
new file mode 100644
index 000000000..049ffd859
--- /dev/null
+++ b/backend/Testing/Browser/Page/SandboxPage.cs
@@ -0,0 +1,10 @@
+using Microsoft.Playwright;
+
+namespace Testing.Browser.Page;
+
+public class SandboxPage : BasePage<SandboxPage>
+{
+    public SandboxPage(IPage page) : base(page, "/sandbox", page.Locator(":text('Sandbox')"))
+    {
+    }
+}
diff --git a/backend/Testing/Browser/SandboxPageTests.cs b/backend/Testing/Browser/SandboxPageTests.cs
new file mode 100644
index 000000000..ddea034dd
--- /dev/null
+++ b/backend/Testing/Browser/SandboxPageTests.cs
@@ -0,0 +1,22 @@
+using Shouldly;
+using Testing.Browser.Base;
+using Testing.Browser.Page;
+
+namespace Testing.Browser;
+
+public class SandboxPageTests : PageTest
+{
+    [Fact]
+    public async Task Goto500Works()
+    {
+        await new SandboxPage(Page).Goto();
+        var request = await Page.RunAndWaitForRequestFinishedAsync(async () =>
+        {
+            await Page.GetByText("goto 500 page").ClickAsync();
+        });
+        var response = await request.ResponseAsync();
+        response.ShouldNotBeNull();
+        response.Ok.ShouldBeFalse();
+        response.Status.ShouldBe(500);
+    }
+}
diff --git a/frontend/src/routes/(authenticated)/sandbox/+page.svelte b/frontend/src/routes/(authenticated)/sandbox/+page.svelte
deleted file mode 100644
index 8b5d64e40..000000000
--- a/frontend/src/routes/(authenticated)/sandbox/+page.svelte
+++ /dev/null
@@ -1,19 +0,0 @@
-<script lang="ts">
-  import TusUpload from '$lib/components/TusUpload.svelte';
-
-  async function execute(): Promise<void> {
-    const response = await fetch('/api/Testing/testRedirect', {redirect: 'follow'});
-    console.log(response);
-  }
-
-  function uploadFinished(): void {
-      alert('upload done!');
-  }
-</script>
-
-<button on:click={execute}>Test</button>
-<div class="card w-96 bg-base-200 shadow-lg">
-  <div class="card-body">
-    <TusUpload endpoint="/api/tus-test" accept="image/*" on:uploadComplete={uploadFinished}/>
-  </div>
-</div>
diff --git a/frontend/src/routes/(unauthenticated)/sandbox/+page.svelte b/frontend/src/routes/(unauthenticated)/sandbox/+page.svelte
new file mode 100644
index 000000000..0b84a412a
--- /dev/null
+++ b/frontend/src/routes/(unauthenticated)/sandbox/+page.svelte
@@ -0,0 +1,20 @@
+<script lang="ts">
+  import TusUpload from '$lib/components/TusUpload.svelte';
+
+
+  function uploadFinished(): void {
+      alert('upload done!');
+  }
+</script>
+<div class="grid gap-2">
+  <h2>Sandbox</h2>
+  <div class="card w-96 bg-base-200 shadow-lg">
+    <a rel="external" class="btn" href="/api/testing/test500NoException">Goto 500 page</a>
+  </div>
+  <div class="card w-96 bg-base-200 shadow-lg">
+    <div class="card-body">
+      <TusUpload endpoint="/api/tus-test" accept="image/*" on:uploadComplete={uploadFinished}/>
+    </div>
+  </div>
+</div>
+