How to Handle Serialization of Closures in Unit Testing Scenarios?

Exception: Serialization of 'Closure'

In a unit testing scenario, you encountered an exception during test execution involving a closure inside the _initMailer method. This exception relates to the serialization of closures, which is not permitted within the PHP test environment.

Specifically, your closure is used as a callback function within a Zend_Mail_Transport_File instance:

$callback = function()
{
    return 'ZendMail_' . microtime(true) .'.tmp';
};

Solution 1: Using a Regular Function

One solution is to replace the closure with a regular function:

function emailCallback() {
    return 'ZendMail_' . microtime(true) . '.tmp';
}
$callback = "emailCallback" ;

Solution 2: Indirect Method Call Using Array Variable

Alternatively, you can use an indirect method call through an array variable:

$callback = array($this,"aMethodInYourClass");

This means that the aMethodInYourClass method will be invoked when the callback is called.

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