cpp-useful-iterators/test/end_aware_iterator_test.cxx

#include "iterator/end_aware_iterator.hpp"

#include <vector>

#include <gmock/gmock.h>

using end_aware_iterator =
    ::iterator::end_aware_iterator<std::vector<int>::iterator>;

TEST(EndAwareIteratorTest, BeginWrapperIsEqualToBegin) {
  std::vector<int> v{1, 2, 3, 4, 5};
  EXPECT_THAT(*v.begin(), *end_aware_iterator(v.begin(), v.end()));
}

TEST(EndAwareIteratorTest, MutableActionsArePassthrough) {
  std::vector<int> v{1, 2, 3, 4, 5};
  *end_aware_iterator(v.begin(), v.end()) = -1;
  EXPECT_THAT(v[0], -1);
}

TEST(EndAwareIteratorTest, CanTellYouThatItsReachedEnd) {
  std::vector<int> v{1, 2, 3, 4, 5};
  end_aware_iterator it{v.end() - 1, v.end()};
  EXPECT_FALSE(it.done());
  ++it;
  EXPECT_THAT(it, end_aware_iterator(v.end(), v.end()));
  EXPECT_TRUE(it.done());
}

TEST(EndAwareIteratorTest, IncrementOnEndIsNoOp) {
  std::vector<int> v{1, 2, 3, 4, 5};
  end_aware_iterator it{v.end(), v.end()};
  end_aware_iterator const cp = it;
  ++it;
  EXPECT_THAT(it, cp);
  EXPECT_TRUE(it.done());
}