1 files changed, 92 insertions, 0 deletions
diff --git a/tests/lsp/test_folding_range.py b/tests/lsp/test_folding_range.py
new file mode 100644
index 0000000..8f9c749
--- /dev/null
+++ b/tests/lsp/test_folding_range.py
@@ -0,0 +1,92 @@
+############################################################################
+# Copyright(c) Open Law Library. All rights reserved.                      #
+# See ThirdPartyNotices.txt in the project root for additional notices.    #
+#                                                                          #
+# Licensed under the Apache License, Version 2.0 (the "License")           #
+# you may not use this file except in compliance with the License.         #
+# You may obtain a copy of the License at                                  #
+#                                                                          #
+#     http: // www.apache.org/licenses/LICENSE-2.0                         #
+#                                                                          #
+# Unless required by applicable law or agreed to in writing, software      #
+# distributed under the License is distributed on an "AS IS" BASIS,        #
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
+# See the License for the specific language governing permissions and      #
+# limitations under the License.                                           #
+############################################################################
+
+from typing import List, Optional
+
+from lsprotocol.types import TEXT_DOCUMENT_FOLDING_RANGE
+from lsprotocol.types import (
+    FoldingRange,
+    FoldingRangeKind,
+    FoldingRangeOptions,
+    FoldingRangeParams,
+    TextDocumentIdentifier,
+)
+
+from ..conftest import ClientServer
+
+
+class ConfiguredLS(ClientServer):
+    def __init__(self):
+        super().__init__()
+
+        @self.server.feature(
+            TEXT_DOCUMENT_FOLDING_RANGE,
+            FoldingRangeOptions(),
+        )
+        def f(params: FoldingRangeParams) -> Optional[List[FoldingRange]]:
+            if params.text_document.uri == "file://return.list":
+                return [
+                    FoldingRange(
+                        start_line=0,
+                        end_line=0,
+                        start_character=1,
+                        end_character=1,
+                        kind=FoldingRangeKind.Comment,
+                    ),
+                ]
+            else:
+                return None
+
+
+@ConfiguredLS.decorate()
+def test_capabilities(client_server):
+    _, server = client_server
+    capabilities = server.server_capabilities
+
+    assert capabilities.folding_range_provider
+
+
+@ConfiguredLS.decorate()
+def test_folding_range_return_list(client_server):
+    client, _ = client_server
+    response = client.lsp.send_request(
+        TEXT_DOCUMENT_FOLDING_RANGE,
+        FoldingRangeParams(
+            text_document=TextDocumentIdentifier(uri="file://return.list"),
+        ),
+    ).result()
+
+    assert response
+
+    assert response[0].start_line == 0
+    assert response[0].end_line == 0
+    assert response[0].start_character == 1
+    assert response[0].end_character == 1
+    assert response[0].kind == FoldingRangeKind.Comment
+
+
+@ConfiguredLS.decorate()
+def test_folding_range_return_none(client_server):
+    client, _ = client_server
+    response = client.lsp.send_request(
+        TEXT_DOCUMENT_FOLDING_RANGE,
+        FoldingRangeParams(
+            text_document=TextDocumentIdentifier(uri="file://return.none"),
+        ),
+    ).result()
+
+    assert response is None