1 files changed, 75 insertions, 0 deletions
diff --git a/libs/tdlib/td/tdutils/test/variant.cpp b/libs/tdlib/td/tdutils/test/variant.cpp
new file mode 100644
index 0000000000..5c5e18d1d8
--- /dev/null
+++ b/libs/tdlib/td/tdutils/test/variant.cpp
@@ -0,0 +1,75 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/utils/Slice.h"
+#include "td/utils/StringBuilder.h"
+#include "td/utils/tests.h"
+#include "td/utils/Variant.h"
+
+REGISTER_TESTS(variant);
+
+using namespace td;
+
+static const size_t BUF_SIZE = 1024 * 1024;
+static char buf[BUF_SIZE], buf2[BUF_SIZE];
+static StringBuilder sb(MutableSlice(buf, BUF_SIZE - 1));
+static StringBuilder sb2(MutableSlice(buf2, BUF_SIZE - 1));
+
+static std::string move_sb() {
+  auto res = sb.as_cslice().str();
+  sb.clear();
+  return res;
+}
+
+static std::string name(int id) {
+  if (id == 1) {
+    return "A";
+  }
+  if (id == 2) {
+    return "B";
+  }
+  if (id == 3) {
+    return "C";
+  }
+  return "";
+}
+
+template <int id>
+class Class {
+ public:
+  Class() {
+    sb << "+" << name(id);
+  }
+  Class(const Class &) = delete;
+  Class &operator=(const Class &) = delete;
+  Class(Class &&) = delete;
+  Class &operator=(Class &&) = delete;
+  ~Class() {
+    sb << "-" << name(id);
+  }
+};
+
+using A = Class<1>;
+using B = Class<2>;
+using C = Class<3>;
+
+TEST(Variant, simple) {
+  {
+    Variant<std::unique_ptr<A>, std::unique_ptr<B>, std::unique_ptr<C>> abc;
+    ASSERT_STREQ("", sb.as_cslice());
+    abc = std::make_unique<A>();
+    ASSERT_STREQ("+A", sb.as_cslice());
+    sb.clear();
+    abc = std::make_unique<B>();
+    ASSERT_STREQ("+B-A", sb.as_cslice());
+    sb.clear();
+    abc = std::make_unique<C>();
+    ASSERT_STREQ("+C-B", sb.as_cslice());
+    sb.clear();
+  }
+  ASSERT_STREQ("-C", move_sb());
+  sb.clear();
+};