@Test
public void testSingleLeafNode() {
TreeNode n1 = new LeafTreeNode(1.0);
EvaluateTreeVisitor v1 = new EvaluateTreeVisitor();
n1.accept(v1);
assertEquals(1.0, v1.getResult(), DELTA);
}
@Test
public void nonNumberNodeForUnaryMinus() {
TreeNode n1 = new LeafTreeNode(1.0);
TreeNode n2 = new LeafTreeNode(2.0);
TreeNode n3 = new AdditionTreeNode(n1, n2);
TreeNode n4 = new UnaryMinusTreeNode(n3);
EvaluateTreeVisitor v1 = new EvaluateTreeVisitor();
n4.accept(v1);
assertEquals(-3.0, v1.getResult(), DELTA);
}
@Test
public void testUnaryMinusBinaryTree() {
TreeNode n1 = new LeafTreeNode(4.0);
TreeNode n2 = new LeafTreeNode(5.0);
TreeNode n3 = new UnaryMinusTreeNode(n1);
TreeNode n4 = new UnaryMinusTreeNode(n2);
TreeNode n5 = new MultiplicationTreeNode(n3, n4);
EvaluateTreeVisitor v1 = new EvaluateTreeVisitor();
n5.accept(v1);
assertEquals(20.0, v1.getResult(), DELTA);
}
@Test
public void treeEvalBalancedTree() {
TreeNode n1 = new LeafTreeNode(1.0);
TreeNode n2 = new LeafTreeNode(2.0);
TreeNode n3 = new LeafTreeNode(3.0);
TreeNode n4 = new LeafTreeNode(4.0);
TreeNode n5 = new AdditionTreeNode(n1, n2);
TreeNode n6 = new MultiplicationTreeNode(n3, n4);
TreeNode n7 = new DivisionTreeNode(n6, n5);
EvaluateTreeVisitor v1 = new EvaluateTreeVisitor();
n7.accept(v1);
assertEquals(4.0, v1.getResult(), DELTA);
}
@Test
public void testMultiplicationNode() {
TreeNode n1 = new LeafTreeNode(1.0);
TreeNode n2 = new LeafTreeNode(2.0);
TreeNode n3 = new MultiplicationTreeNode(n1, n2);
TreeNode n4 = new MultiplicationTreeNode(n2, n1);
EvaluateTreeVisitor v1 = new EvaluateTreeVisitor();
n3.accept(v1);
assertEquals(2.0, v1.getResult(), DELTA);
EvaluateTreeVisitor v2 = new EvaluateTreeVisitor();
n4.accept(v2);
assertEquals(2.0, v2.getResult(), DELTA);
}