public void IfPositionIsValid()
{
var dimensions = new Dimensions
{
Width = 10,
Height = 100
};
var arena = new Arena(dimensions);
Assert.True(arena.CheckPosition(0, 0));
Assert.True(arena.CheckPosition(9, 99));
Assert.True(arena.CheckPosition(10, 100));
Assert.False(arena.CheckPosition(-1, 2));
Assert.False(arena.CheckPosition(1, -2));
Assert.False(arena.CheckPosition(-1, -2));
Assert.False(arena.CheckPosition(9, 101));
Assert.False(arena.CheckPosition(11, 10));
Assert.False(arena.CheckPosition(11, 102));
}