cpp-descriptive-pointers/test/not_null_test.cxx

//
//  not_null.t.h
//  pointers
//
//  Created by Sam Jaffe on 12/2/16.
//

#include "pointers/not_null.hpp"

#include <gmock/gmock.h>

#include "test_stubs.h"

using namespace pointers;

TEST(NonNullPtrTest, ThrowsIfNullptrIsSnuckIn) {
  EXPECT_THROW(not_null<std::shared_ptr<int>>(std::shared_ptr<int>(nullptr)),
               null_pointer_exception);
}

TEST(NonNullPtrTest, ContainsInnerPtrForEquality) {
  std::shared_ptr<int> i{new int};
  not_null<std::shared_ptr<int>> n{i};
  EXPECT_THAT(n.get(), i.get());
  EXPECT_THAT(*n, *i);
}

TEST(NonNullPtrTest, CanModifyInnerValue) {
  std::shared_ptr<int> i{new int(5)};
  not_null<std::shared_ptr<int>> n{i};
  EXPECT_THAT(*n, 5);
  *n = 4;
  EXPECT_THAT(*i, 4);
}

TEST(NonNullPtrTest, DoesNotDeleteRawPtr) {
  bool has_delete{false};
  destructor_sentinal * test_struct = new destructor_sentinal{has_delete};
  not_null<destructor_sentinal *>{test_struct};
  EXPECT_FALSE(has_delete);
  delete test_struct;
  EXPECT_TRUE(has_delete);
}