///////////////////////////////////////////////////////////////////////////////
// For information as to what this class does, see the Javadoc, below.       //
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
// 2007, 2008, 2009, 2010, 2014, 2015, 2022 by Peter Spirtes, Richard        //
// Scheines, Joseph Ramsey, and Clark Glymour.                               //
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// it under the terms of the GNU General Public License as published by      //
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package edu.cmu.tetrad.test;

import edu.cmu.tetrad.graph.EdgeListGraph;
import edu.cmu.tetrad.graph.Graph;
import edu.cmu.tetrad.graph.GraphNode;
import edu.cmu.tetrad.graph.Node;
import org.junit.Test;

import static junit.framework.TestCase.assertFalse;
import static org.junit.Assert.assertTrue;


/**
 * Tests the functions of the (non)/collider detection methods in Graph.
 *
 * @author Erin Korber
 */
public final class TestCollisions {

    @Test
    public void testMatrixGraph() {
        checkGraph(new EdgeListGraph());
    }

    @Test
    public void testListGraph() {
        checkGraph(new EdgeListGraph());
    }

    private void checkGraph(Graph graph) {
        Node x1 = new GraphNode("x1");
        Node x2 = new GraphNode("x2");
        Node x3 = new GraphNode("x3");

        graph.addNode(x1);
        graph.addNode(x2);
        graph.addNode(x3);

        graph.addDirectedEdge(x1, x2);
        graph.addDirectedEdge(x3, x2);

        //basic unshielded collider
        assertTrue(graph.isDefCollider(x1, x2, x3));

        graph.clear();

        graph.addNode(x1);
        graph.addNode(x2);
        graph.addNode(x3);

        graph.addDirectedEdge(x2, x1);
        graph.addUndirectedEdge(x2, x3);

        //one edge out from x2
        assertTrue(graph.isDefNoncollider(x1, x2, x3));

        graph.clear();

        graph.addNode(x1);
        graph.addNode(x2);
        graph.addNode(x3);

        graph.addUndirectedEdge(x1, x3);
        graph.addDirectedEdge(x1, x2);
        graph.addUndirectedEdge(x3, x2);

        //shielded, one edge in
        assertFalse(graph.isDefNoncollider(x1, x2, x3));
        assertFalse(graph.isDefCollider(x1, x2, x3));

    }
}





