public function testCanCompareNumberNodes()
{
$node = new NumberNode(3);
$other = new VariableNode('x');
$inode = new IntegerNode(2);
$rnode = new RationalNode(4, 2);
$this->assertFalse($node->compareTo(null));
$this->assertFalse($node->compareTo($other));
$this->assertTrue($node->compareTo($node));
$this->assertFalse($node->compareTo(new IntegerNode(7)));
$this->assertTrue($inode->compareTo($rnode));
$this->assertTrue($rnode->compareTo($inode));
$this->assertTrue($inode->compareTo($inode));
$this->assertTrue($rnode->compareTo($rnode));
$this->assertFalse($inode->compareTo(new Integernode(3)));
$this->assertFalse($node->compareTo(null));
$this->assertFalse($other->compareTo(null));
$this->assertFalse($inode->compareTo(null));
$this->assertFalse($rnode->compareTo(null));
$this->assertFalse($rnode->compareTo(new IntegerNode(3)));
$this->assertFalse($rnode->compareTo($other));
$this->assertFalse($inode->compareTo(new RationalNode(3, 5)));
$this->assertFalse($inode->compareTo($other));
}
