add test

openmls/src/group/tests_and_kats/tests/group.rs

@@ -1,6 +1,6 @@
 use crate::{framing::*, group::*, test_utils::*, *};
 use mls_group::tests_and_kats::utils::{setup_alice_bob, setup_alice_bob_group, setup_client};
-use treesync::LeafNodeParameters;
+use treesync::{node::leaf_node::Capabilities, LeafNodeParameters};
 
 #[openmls_test::openmls_test]
 fn create_commit_optional_path(
@@ -104,6 +104,41 @@ fn basic_group_setup() {
         };
 }
 
+#[openmls_test::openmls_test]
+fn wrong_group_create_config() {
+    MlsGroupCreateConfig::builder()
+        .with_leaf_node_extensions(Extensions::single(Extension::Unknown(
+            0xff00,
+            UnknownExtension(b"testdata".to_vec()),
+        )))
+        .expect_err("leaf node extension is not in leaf node capabilities, should have failed");
+
+    MlsGroupCreateConfig::builder()
+        .capabilities(
+            Capabilities::builder()
+                .extensions(vec![ExtensionType::Unknown(0xff00)])
+                .build(),
+        )
+        .with_leaf_node_extensions(Extensions::single(Extension::Unknown(
+            0xff01,
+            UnknownExtension(b"testdata".to_vec()),
+        )))
+        .expect_err("leaf node extension is not in leaf node capabilities, should have failed");
+
+    MlsGroupCreateConfig::builder()
+        .capabilities(
+            Capabilities::builder()
+                .extensions(vec![ExtensionType::Unknown(0xff00)])
+                .build(),
+        )
+        .with_leaf_node_extensions(Extensions::single(Extension::Unknown(
+            0xff00,
+            UnknownExtension(b"testdata".to_vec()),
+        )))
+        .expect("leaf node extension is in leaf node capabilities, should have succeeded")
+        .build();
+}
+
 /// This test simulates various group operations like Add, Update, Remove in a
 /// small group
 ///  - Alice creates a group