diff --git a/input/tests/views.py b/input/tests/views.py
index 53101d5..9bd961d 100644
--- a/input/tests/views.py
+++ b/input/tests/views.py
@@ -9,7 +9,7 @@ class AnonymousViewTestCase(TestCase):
     def test_index(self):
         response = request(self, 'index')
 
-        self.assertContains(response,'<a href="https://srcsrv.wikimedia.de/beba/foerderbarometer">Sourcecode</a>')
+        self.assertContains(response, '<a href="https://srcsrv.wikimedia.de/beba/foerderbarometer">Sourcecode</a>')
 
     def test_extern(self):
         request(self, 'extern')
@@ -131,3 +131,36 @@ class AuthenticatedViewTestCase(TestCase):
 
     def test_deny_error(self):
         self.helper_auth_deny_error('deny')
+
+
+class TermsConsentViewTests(AnonymousViewTestCase):
+
+    def test_extern_lit(self):
+        """
+        Negative case: Literature form without terms_accepted must not succeed
+        and should display a required field error.
+        """
+        # Step 1
+        resp = request(self, 'extern', data=self.get_first_step_data('LIT'))
+        self.assertContains(resp, 'Literatur verwenden')
+
+        # Step 2: submit without terms_accepted
+        payload = self.get_step_data(1, {
+            'cost': 20,
+            'info': 'Test',
+            'source': 'Test',
+            'notes': '',
+            'selfbuy': 'TRUE',
+            'selfbuy_data': 'NONE',
+            'selfbuy_give_data': 'on',  # checkbox checked
+            # terms_accepted intentionally omitted
+        })
+        resp = request(self, 'extern', data=payload)
+
+        # Expect to remain on step 2 with required field error
+        self.assertEqual(resp.status_code, 200)
+        self.assertNotContains(resp, 'Deine Anfrage wurde gesendet.')
+        self.assertRegex(
+            resp.content.decode(),
+            r'(Dieses Feld ist erforderlich|This field is required\.)'
+        )