public static void GetEnumerator_Allows_Enumeration_Over_Coordinates()
{
List <CartesianCoordinate> coordinates = new List <CartesianCoordinate>()
{
new CartesianCoordinate(0, 0),
new CartesianCoordinate(1, 2),
new CartesianCoordinate(3, 4),
new CartesianCoordinate(5, 6)
};
PointBoundary boundary = new PointBoundary(coordinates);
IEnumerator enumerator = boundary.GetEnumerator();
enumerator.MoveNext();
Assert.AreEqual(coordinates[0], enumerator.Current);
enumerator.MoveNext();
Assert.AreEqual(coordinates[1], enumerator.Current);
enumerator.MoveNext();
Assert.AreEqual(coordinates[2], enumerator.Current);
enumerator.MoveNext();
Assert.AreEqual(coordinates[3], enumerator.Current);
enumerator.Reset();
enumerator.MoveNext();
Assert.AreEqual(coordinates[0], enumerator.Current);
}
public static void GetEnumerator_Current_Throws_Invalid_Operation_Exception_if_Not_Initialized()
{
List <CartesianCoordinate> coordinates = new List <CartesianCoordinate>()
{
new CartesianCoordinate(0, 0),
new CartesianCoordinate(1, 2),
new CartesianCoordinate(3, 4),
new CartesianCoordinate(5, 6)
};
PointBoundary boundary = new PointBoundary(coordinates);
IEnumerator enumerator = boundary.GetEnumerator();
Assert.Throws <InvalidOperationException>(() => { var item = enumerator.Current; });
}
