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');
}