public function testParseComparison()
{
$ast = ExpressionParser::parseComparison(ExpressionParser::lex('3 = 3'));
$this->assertInstanceOf('Jivoo\\Data\\Query\\Expression\\Infix', $ast);
$this->assertInstanceOf('Jivoo\\Data\\Query\\Expression\\Literal', $ast->left);
$this->assertInstanceOf('Jivoo\\Data\\Query\\Expression\\Literal', $ast->right);
$this->assertEquals('=', $ast->operator);
$ast = ExpressionParser::parseComparison(ExpressionParser::lex('3 is null'));
$this->assertInstanceOf('Jivoo\\Data\\Query\\Expression\\Infix', $ast);
$this->assertInstanceOf('Jivoo\\Data\\Query\\Expression\\Literal', $ast->left);
$this->assertNull($ast->right);
$this->assertEquals('is', $ast->operator);
}