api: Add route deleteMessage

Author: chrisbobbe

lib/api/route/messages.dart

@@ -250,6 +250,14 @@ class UpdateMessageResult {
   Map<String, dynamic> toJson() => _$UpdateMessageResultToJson(this);
 }
 
+/// https://zulip.com/api/delete-message
+Future<void> deleteMessage(
+  ApiConnection connection, {
+  required int messageId,
+}) {
+  return connection.delete('deleteMessage', (_) {}, 'messages/$messageId', {});
+}
+
 /// https://zulip.com/api/upload-file
 Future<UploadFileResult> uploadFile(
   ApiConnection connection, {

test/api/route/messages_test.dart

@@ -450,6 +450,18 @@ void main() {
     });
   });
 
+  group('updateMessage', () {
+    test('smoke', () {
+      return FakeApiConnection.with_((connection) async {
+        connection.prepare(json: {});
+        await deleteMessage(connection, messageId: 123321);
+        check(connection.takeRequests()).single.isA<http.Request>()
+          ..method.equals('DELETE')
+          ..url.path.equals('/api/v1/messages/123321');
+      });
+    });
+  });
+
   group('uploadFile', () {
     Future<void> checkUploadFile(FakeApiConnection connection, {
       required List<List<int>> content,