public function testArrMul2()
{
$renderer = RenderStringVisitor::init();
$simplfier = SimplifyVisitor::init();
$am = new ArrayMultiplicationNode(new ConstantNode(3), new VariableNode('x'), new ConstantNode(5));
$this->assertEquals('3 * x * 5', $renderer->visit($am));
$this->assertEquals('15 * x', $renderer->visit($simplfier->visit($am)));
}
public function testTreeRender2()
{
$deriver = new DerivationVisitor('x');
$simplfier = SimplifyVisitor::init();
$renderer = RenderStringVisitor::init();
$f = Tree::add(Tree::mult(3, 'x'), Tree::mult(2, 'x'), 3)->pow(2);
$this->assertEquals("(3 * x + 2 * x + 3) ^ 2", $renderer->visit($f));
$this->assertEquals('10 * (3 * x + 2 * x + 3)', $renderer->visit($simplfier->visit($deriver->visit($f))));
$this->assertEquals(50, $renderer->visit($simplfier->visit($deriver->visit($deriver->visit($f)))));
}