public void AddNodeMutation_Mutate_AddsNodeAndConnection()
{
//ARRANGE
var genome = CreateGenome(1, 1);
genome.Connections.Add(1,
new Connection {
Id = 1, InNodeId = 1, OutNodeId = 2, IsEnabled = true, Weight = 2.0
});
_nodeInnovationGenerator.GetNextInnovation().Returns(3);
_connectionInnovationGenerator.GetNextInnovation().Returns(2, 3);
_randomizer.Next(1).Returns(call => call.Arg <int>() - 1);
var mutator = new AddNodeMutation(_nodeInnovationGenerator, _connectionInnovationGenerator, _randomizer);
//ACT
var result = mutator.Mutate(ref genome);
//ASSERT
Assert.IsTrue(result);
Assert.AreEqual(3, genome.Connections.Count);
Assert.AreEqual(3, genome.Nodes.Count);
Assert.AreEqual(NodeType.Hidden, genome.Nodes[3].NodeType);
AssertConnection(genome, 1, false, 1, 2, 2.0);
AssertConnection(genome, 2, true, 1, 3, 1.0);
AssertConnection(genome, 3, true, 3, 2, 2.0);
}
public void AddNodeMutation_Mutate_DidNotAddNodesSinceNoConnections()
{
//ARRANGE
var genome = CreateGenome(1, 1);
var mutator = new AddNodeMutation(_nodeInnovationGenerator, _connectionInnovationGenerator, _randomizer);
//ACT
var result = mutator.Mutate(ref genome);
//ASSERT
Assert.IsFalse(result);
Assert.AreEqual(0, genome.Connections.Count);
Assert.AreEqual(2, genome.Nodes.Count);
}
public void AddNodeMutation_Mutate_DidNotAddNodesSinceNoEnabledConnections()
{
//ARRANGE
var genome = CreateGenome(1, 1);
genome.Connections.Add(1,
new Connection {
Id = 1, InNodeId = 1, OutNodeId = 2, IsEnabled = false, Weight = 1.0
});
var mutator = new AddNodeMutation(_nodeInnovationGenerator, _connectionInnovationGenerator, _randomizer);
//ACT
var result = mutator.Mutate(ref genome);
//ASSERT
Assert.IsFalse(result);
Assert.AreEqual(1, genome.Connections.Count);
Assert.AreEqual(2, genome.Nodes.Count);
}
