public void CheckFindFirstMatch()
        {
            // Arrange
            var sit = new GridNavigator();

            // Act
            var result = sit.FindFirst(grid, c => c == 'X');

            var(x, y) = result.NewPosition;

            result.IsInGrid.Should().BeTrue();
            x.Should().Be(1);
            y.Should().Be(1);
            result.NewValue.Should().Be('X');
        }