test(lsp): format markdown files

cli/lsp/language_server.rs

@@ -3212,6 +3212,55 @@ mod tests {
     harness.run().await;
   }
 
+  #[tokio::test]
+  async fn test_format_markdown() {
+    let mut harness = LspTestHarness::new(vec![
+      (
+        LspFixture::Path("initialize_request.json"),
+        LspResponse::RequestAny,
+      ),
+      (
+        LspFixture::Path("initialized_notification.json"),
+        LspResponse::None,
+      ),
+      (
+        LspFixture::Path("did_open_markdown.json"),
+        LspResponse::None,
+      ),
+      (
+        LspFixture::Path("formatting_request_markdown.json"),
+        LspResponse::Request(
+          2,
+          json!([
+            {
+              "range": {
+                "start": { "line": 0, "character": 1 },
+                "end": { "line": 0, "character": 3 }
+              },
+              "newText": ""
+            },
+            {
+              "range": {
+                "start": { "line": 0, "character": 15 },
+                "end": { "line": 0, "character": 15 }
+              },
+              "newText": "\n"
+            }
+          ]),
+        ),
+      ),
+      (
+        LspFixture::Path("shutdown_request.json"),
+        LspResponse::Request(3, json!(null)),
+      ),
+      (
+        LspFixture::Path("exit_notification.json"),
+        LspResponse::None,
+      ),
+    ]);
+    harness.run().await;
+  }
+
   #[tokio::test]
   async fn test_call_hierarchy() {
     let mut harness = LspTestHarness::new(vec![

cli/tests/lsp/did_open_markdown.json

@@ -0,0 +1,12 @@
+{
+  "jsonrpc": "2.0",
+  "method": "textDocument/didOpen",
+  "params": {
+    "textDocument": {
+      "uri": "file:///a/file.md",
+      "languageId": "markdown",
+      "version": 1,
+      "text": "#   Hello World"
+    }
+  }
+}

cli/tests/lsp/formatting_request_markdown.json

@@ -0,0 +1,14 @@
+{
+  "jsonrpc": "2.0",
+  "id": 2,
+  "method": "textDocument/formatting",
+  "params": {
+    "textDocument": {
+      "uri": "file:///a/file.md"
+    },
+    "options": {
+      "tabSize": 2,
+      "insertSpaces": true
+    }
+  }
+}