@Test
public void testEasyTriangle() {
CobwebGraph easy = new CobwebGraph(3);
CobwebSolver solver;
easy.setEdge(1, 2, Edge.EdgeOperation.MULTIPLICATION, 2);
easy.setEdge(1, 3, Edge.EdgeOperation.ADDITION, 1);
easy.setEdge(3, 2, Edge.EdgeOperation.ADDITION, 2);
easy.setNode(1, 2);
solver = new CobwebSolver(easy.map);
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, solver.numberOfSolutions());
easy.setNode(1, 3);
solver = new CobwebSolver(easy.map);
assertEquals(CobwebSolver.SolverState.SINGLE_SOLUTION, solver.numberOfSolutions());
}
@Test
public void testGraphWithNoCycles() {
CobwebGraph unbound = new CobwebGraph(3);
unbound.setEdge(1, 2, Edge.EdgeOperation.MULTIPLICATION, 2);
unbound.setEdge(2, 3, Edge.EdgeOperation.ADDITION, 5);
CobwebSolver solver = new CobwebSolver(unbound.map);
assertEquals(CobwebSolver.SolverState.INFINITE_SOLUTIONS, solver.numberOfSolutions());
}
@Test
public void testGraphOnlySolvableWithNegativeNumbers() {
CobwebGraph negative = new CobwebGraph(3);
negative.setEdge(1, 2, Edge.EdgeOperation.MULTIPLICATION, 2);
negative.setEdge(2, 3, Edge.EdgeOperation.ADDITION, 5);
negative.setEdge(3, 1, Edge.EdgeOperation.ADDITION, 1);
CobwebSolver solver = new CobwebSolver(negative.map);
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, solver.numberOfSolutions());
}
@Test
public void testUnsolvableGraph() {
CobwebGraph bad = new CobwebGraph(3);
bad.setEdge(1, 2, Edge.EdgeOperation.MULTIPLICATION, 2);
bad.setEdge(2, 3, Edge.EdgeOperation.ADDITION, 5);
bad.setEdge(3, 1, Edge.EdgeOperation.DIVISION, 2);
CobwebSolver solver = new CobwebSolver(bad.map);
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, solver.numberOfSolutions());
}
@Test
public void testInfiniteSolutions() {
CobwebGraph infinite = new CobwebGraph(3);
infinite.setEdge(1, 2, Edge.EdgeOperation.ADDITION, 1);
infinite.setEdge(2, 3, Edge.EdgeOperation.ADDITION, 1);
infinite.setEdge(3, 1, Edge.EdgeOperation.SUBTRACTION, 2);
CobwebSolver solver = new CobwebSolver(infinite.map);
assertEquals(CobwebSolver.SolverState.INFINITE_SOLUTIONS, solver.numberOfSolutions());
}
@Test
public void testEasyQuad() {
CobwebGraph quad = new CobwebGraph(4);
CobwebSolver solver;
quad.setEdge(1, 2, Edge.EdgeOperation.ADDITION, 6);
quad.setEdge(2, 3, Edge.EdgeOperation.MULTIPLICATION, 2);
quad.setEdge(1, 4, Edge.EdgeOperation.MULTIPLICATION, 3);
quad.setEdge(4, 3, Edge.EdgeOperation.ADDITION, 1);
solver = new CobwebSolver(quad.map);
assertEquals(CobwebSolver.SolverState.SINGLE_SOLUTION, solver.numberOfSolutions());
quad.setNode(4, 33);
solver = new CobwebSolver(quad.map);
assertFalse(solver.hasUnreachableNodes());
assertEquals(CobwebSolver.SolverState.SINGLE_SOLUTION, solver.numberOfSolutions());
quad.setNode(4, 15);
solver = new CobwebSolver(quad.map);
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, solver.numberOfSolutions());
}
@Test
public void testAlreadySolved() {
CobwebSolver solver = new CobwebSolver(new CobwebGraph(3).map);
solver.setEdge(1, 2, Edge.EdgeOperation.DIVISION, 2);
solver.setEdge(3, 2, Edge.EdgeOperation.ADDITION, 1);
solver.setEdge(1, 3, Edge.EdgeOperation.DIVISION, 3);
solver.setNode(1, 6);
solver.setNode(2, 3);
solver.setNode(3, 2);
assertEquals(CobwebSolver.SolverState.SOLVED_ALREADY, solver.numberOfSolutions());
}
@Test
public void testGraphWithBadCycle() {
CobwebGraph bad = new CobwebGraph(5);
bad.setEdge(1, 2, Edge.EdgeOperation.SUBTRACTION, 1);
bad.setEdge(2, 3, Edge.EdgeOperation.SUBTRACTION, 1);
bad.setEdge(3, 4, Edge.EdgeOperation.SUBTRACTION, 1);
bad.setEdge(4, 5, Edge.EdgeOperation.SUBTRACTION, 1);
bad.setEdge(2, 4, Edge.EdgeOperation.ADDITION, 2);
CobwebSolver solver = new CobwebSolver(bad.map);
CobwebSolver.SolverState result = solver.numberOfSolutions();
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, result);
}
@Test
public void testGraphPentagram() {
CobwebGraph bad = new CobwebGraph(5);
bad.setEdge(1, 2, Edge.EdgeOperation.MULTIPLICATION, 2);
bad.setEdge(2, 3, Edge.EdgeOperation.ADDITION, 1);
bad.setEdge(3, 4, Edge.EdgeOperation.SUBTRACTION, 5);
bad.setEdge(4, 5, Edge.EdgeOperation.DIVISION, 6);
bad.setEdge(5, 1, Edge.EdgeOperation.ADDITION, 8);
CobwebSolver solver = new CobwebSolver(bad.map);
CobwebSolver.SolverState result = solver.numberOfSolutions();
assertEquals(CobwebSolver.SolverState.SINGLE_SOLUTION, result);
}
@Test
public void testIncompleteGraph() {
CobwebGraph easy = new CobwebGraph(3);
CobwebSolver solver = new CobwebSolver(easy.map);
assertEquals(CobwebSolver.SolverState.NO_SOLUTION, solver.numberOfSolutions());
}