Mocking PDO functions issue in phpunit - php

Question

This is my function for which I am trying to test if it throws an exception or not:
public function myFunction(): bool
{
$dateInterval = new \DateTime();
$dateInterval->sub(new \DateInterval('PT24H'));
/** #var \PDOStatement $stmt */
$stmt = $this->pdo->prepare('SELECT SUM(`values`) FROM `event_tracker` WHERE `identifier` = ? AND `mutated_at` >= ? AND `source` = ? AND `customer` = ?');
$stmt->execute([$this->identifier, $dateInterval->getTimestamp(), $this->source, $this->customer]);
$sum = $stmt->fetchColumn(0);
if ($this->checkSourceType($this->source) && $sum >= $this->amountLimitCMS[$this->storeId] ){
$this->exceptionMessage($this->amountLimitCMS[$this->countryIso], $dateInterval->format('H:i d-m-Y'), $this->source);
}
if (!$this->checkSourceType($this->source) && $sum >= $this->amountLimitMagento[$this->storeId] ){
$this->exceptionMessage($this->amountLimitMagento[$this->storeId], $dateInterval->format('H:i d-m-Y'), $this->source);
}
return true;
}
This is my unitTest function:
public function testAmountCheckForCMS()
{
$query = [
'store_id' => 13,
'shipping_countryiso2' => 'DK',
'amount' => 4000,
];
$customer = '000003090';
$source = 'fulfillment_prod';
$container = new Container();
$container['db'] = function ($container) {
return $this->createMock(\PDO::class);
};
$dateInterval = new \DateTime();
$dateInterval->sub(new \DateInterval('PT24H'));
$ordersPerCustomer = new AmountPerCustomer($container, $customer, $query, $source);
$fetchAllMock = $this
->getMockBuilder('PDOStatement')
->setMethods(['execute'])
->getMock();
$fetchAllMock
->expects($this->once())->method('fetchColumn')
->will($this->returnValue($query['amount']));
try {
$ordersPerCustomer->assertPassedCriteria();
$this->fail("Expected Exception has not been raised.");
}catch (\Exception $error) {
$this->assertEquals($error->getMessage(), "Total order amount event given parameters exceed sum {$query['amount']} since {$dateInterval->format('H:i d-m-Y')} from source {$source}");
}
}
As you in see, in my function, which I would like to test, the execute and fetchColumn functions are used. How can I mock them ? Right now, when I run my tests I am getting this error message:
Trying to configure method "fetchColumn" which cannot be configured because it does not exist, has not been specified, is final, or is static
Any idea how can I fix this ? Thank you!

Answer 1

I know I am late here but you need to set that method in mockBuilder so that it can be mocked.
here is the sample code -
$this->getMockBuilder(PDOStatement::class)
->disableOriginalConstructor()
->setMethods(["fetchColumn"])
->getMock();