public function testLookupFunction()
{
$fridge = new Fridge();
$ingredient1 = new Ingredient('bread', 1, 'slices', new DateTime('+30 day'));
$ingredient2 = new Ingredient('butter', 1, 'slices', new DateTime('+30 day'));
$ingredient3 = new Ingredient('butter', 2, 'slices', new DateTime('+15 day'));
$fridge->put($ingredient1);
$fridge->put($ingredient2);
$fridge->put($ingredient3);
$results = $fridge->lookup("butter", "slices", 1);
$this->assertEquals($results[0], $ingredient3);
$this->assertEquals(sizeof($results), 1);
$results = $fridge->lookup("butter", "slices", 2);
$this->assertEquals($results[0], $ingredient3);
$this->assertEquals(sizeof($results), 1);
$results = $fridge->lookup("butter", "slices", 3);
$this->assertEquals($results[0], $ingredient3);
$this->assertEquals($results[1], $ingredient2);
$this->assertEquals(sizeof($results), 2);
}
