public void Calculate_SetsIds_WhenCalled()
        {
            // Arrange
            var expected = new[]
            {
                1,
                4,
                2,
                3
            };

            // Act
            m_Sut.Calculate(m_FromPoint);

            // Assert
            NUnitHelper.AssertIntegers(expected,
                                       m_Sut.Ids());
        }