public void Test()
{
var connection = new GraphConnection <int>();
connection.AddPredecessor(1);
Assert.True(connection.IsPredecessors(1));
Assert.True(connection.RemovePredecessor(1));
Assert.False(connection.IsPredecessors(1));
connection.AddSuccessor(1);
Assert.True(connection.IsSuccessors(1));
Assert.True(connection.RemoveSuccessor(1));
Assert.False(connection.IsSuccessors(1));
connection.AddPredecessor(1);
connection.AddSuccessor(1);
Assert.True(connection.IsPredecessors(1));
Assert.True(connection.IsSuccessors(1));
Assert.True(connection.RemovePredecessor(1));
Assert.False(connection.IsPredecessors(1));
connection.AddPredecessor(1);
Assert.True(connection.RemoveSuccessor(1));
Assert.False(connection.IsSuccessors(1));
Assert.True(connection.RemovePredecessor(1));
Assert.False(connection.RemovePredecessor(1));
Assert.False(connection.RemoveSuccessor(1));
}
