parallel-libs/acxxel/tests/status_test.cpp

   1 //===--- status_test.cpp - Tests for the Status and Expected classes ------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "status.h"
  10
  11 #include "gtest/gtest.h"
  12
  13 #include <memory>
  14
  15 namespace {
  16
  17 struct RefCounter {
  18   static int Count;
  19
  20   RefCounter() { ++Count; }
  21   ~RefCounter() { --Count; }
  22   RefCounter(const RefCounter &) = delete;
  23   RefCounter &operator=(const RefCounter &) = delete;
  24 };
  25
  26 int RefCounter::Count;
  27
  28 TEST(Expected, RefCounter) {
  29   RefCounter::Count = 0;
  30   using uptr = std::unique_ptr<RefCounter>;
  31
  32   acxxel::Expected<uptr> E0(uptr(new RefCounter));
  33   EXPECT_FALSE(E0.isError());
  34   EXPECT_EQ(1, RefCounter::Count);
  35
  36   acxxel::Expected<uptr> E1(std::move(E0));
  37   EXPECT_FALSE(E1.isError());
  38   EXPECT_EQ(1, RefCounter::Count);
  39
  40   acxxel::Expected<uptr> E2(acxxel::Status("nothing in here yet"));
  41   EXPECT_TRUE(E2.isError());
  42   EXPECT_EQ(1, RefCounter::Count);
  43   E2 = std::move(E1);
  44   EXPECT_FALSE(E2.isError());
  45   EXPECT_EQ(1, RefCounter::Count);
  46
  47   EXPECT_EQ(1, E2.getValue()->Count);
  48   EXPECT_FALSE(E2.isError());
  49   EXPECT_EQ(1, RefCounter::Count);
  50
  51   EXPECT_EQ(1, E2.takeValue()->Count);
  52   EXPECT_EQ(0, RefCounter::Count);
  53 }
  54
  55 } // namespace