@Test
public void returnsConnections() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Layer bottomLayer = new Layer();
Connections firstConnection = new FullyConnected(topLayer, middleLayer, 0, 0);
Connections secondConnection = new FullyConnected(middleLayer, bottomLayer, 0, 0);
topLayer.addConnection(firstConnection);
middleLayer.addConnection(firstConnection);
middleLayer.addConnection(secondConnection);
bottomLayer.addConnection(secondConnection);
layers.add(topLayer);
layers.add(middleLayer);
layers.add(bottomLayer);
network.setLayers(layers);
List<Connections> connections = network.getConnections();
assertTrue(connections.contains(firstConnection));
assertTrue(connections.contains(secondConnection));
}
@Test
public void addLayerToANullLayerList() {
Layer topLayer = new Layer();
network.setLayers(null);
assertTrue(network.addLayer(topLayer));
assertEquals(topLayer, network.getOutputLayer());
}
@Test
public void addLayersAddsLayersToNullLayerList() {
network.setLayers(null);
List<Layer> layers = new ArrayList<Layer>();
layers.add(new Layer());
layers.add(new Layer());
network.addLayers(layers);
assertEquals(2, network.getLayers().size());
}
@Test
public void canSetLayersOnAnUninitializedNetwork() {
assertEquals(0, network.getLayers().size());
Set<Layer> layers = new HashSet<Layer>();
layers.add(new Layer());
layers.add(new Layer());
layers.add(new Layer());
network.setLayers(layers);
assertEquals(layers, network.getLayers());
}
@Test
public void removesNonexistentLayer() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Layer bottomLayer = new Layer();
layers.add(topLayer);
layers.add(middleLayer);
layers.add(bottomLayer);
network.setLayers(layers);
assertTrue(network.removeLayer(new Layer()));
}
@Test
public void returnsConnectionBetweenTwoLayers() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Connections firstConnection = new FullyConnected(topLayer, middleLayer, 0, 0);
topLayer.addConnection(firstConnection);
layers.add(topLayer);
layers.add(middleLayer);
network.setLayers(layers);
assertEquals(firstConnection, network.getConnection(topLayer, middleLayer));
assertEquals(firstConnection, network.getConnection(middleLayer, topLayer));
}
@Test
public void returnsNullWhenThereIsntAConnectingLayer() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Layer bottomLayer = new Layer();
Connections firstConnection = new FullyConnected(topLayer, middleLayer, 0, 0);
topLayer.addConnection(firstConnection);
layers.add(topLayer);
layers.add(middleLayer);
network.setLayers(layers);
assertNull(network.getConnection(topLayer, bottomLayer));
assertNull(network.getConnection(bottomLayer, topLayer));
}
@Test
public void returnsInputLayer() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Layer bottomLayer = new Layer();
Connections firstConnection = new FullyConnected(topLayer, middleLayer, 0, 0);
Connections secondConnection = new FullyConnected(middleLayer, bottomLayer, 0, 0);
topLayer.addConnection(firstConnection);
middleLayer.addConnection(firstConnection);
middleLayer.addConnection(secondConnection);
bottomLayer.addConnection(secondConnection);
layers.add(topLayer);
layers.add(middleLayer);
layers.add(bottomLayer);
network.setLayers(layers);
assertEquals(topLayer, network.getInputLayer());
}
@Test
public void removesTopLayer() {
Set<Layer> layers = new HashSet<Layer>();
Layer topLayer = new Layer();
Layer middleLayer = new Layer();
Layer bottomLayer = new Layer();
Connections firstConnection = new FullyConnected(topLayer, middleLayer, 0, 0);
Connections secondConnection = new FullyConnected(middleLayer, bottomLayer, 0, 0);
topLayer.addConnection(firstConnection);
middleLayer.addConnection(firstConnection);
middleLayer.addConnection(secondConnection);
bottomLayer.addConnection(secondConnection);
layers.add(topLayer);
layers.add(middleLayer);
layers.add(bottomLayer);
network.setLayers(layers);
assertTrue(network.removeLayer(topLayer));
}
@Test
public void removeLayerFromNullLayerList() {
network.setLayers(null);
assertFalse(network.removeLayer(new Layer()));
}
@Test
public void returnsEmptySetOfConnectionsOnNullLayers() {
network.setLayers(null);
assertEquals(0, network.getConnections().size());
}