public void GivenSetOfBoxesNotContainingKey_WhenFindWithLoopIsInvoked_ThenNullIsReturned()
        {
            // Arrange
            var box = GetBox();

            // Act
            var result = KeyFinder.FindWithLoop(box);

            // Assert
            Assert.Null(result);
        }
        public void GivenSetOfBoxesContainingKey_WhenFindWithLoopIsInvoked_ThenKeyWithBoxIsReturned()
        {
            // Arrange
            var box = GetBox(withKey: true);

            // Act
            var result = KeyFinder.FindWithLoop(box);

            // Assert
            Assert.NotNull(result);
            Assert.True(result.HasKey);
        }