Issues arise while utilizing the execute method in PHPUnit-Selenium2

When creating Acceptance tests with PhpUnit and its Selenium2 extension, I am attempting to utilize the execute method within the PHPUnit_Extensions_Selenium2TestCase class to run Javascript code that checks if the document is fully loaded.

Here is an example test I tried:

$this->waitUntil(function (LoginTest $driver) {
    if ( $driver->execute( 'return document.readyState;' ) == 'complete' ) {
        return true;
    }
    return null;
}, 10000);

However, I encountered the following error:

InvalidArgumentException: The JSON parameters must be an array, or a NULL value in case they are not required.

Realizing that it expects an array, I then attempted this approach:

$this->waitUntil(function (LoginTest $driver) {
    if ( $driver->execute( ['return document.readyState;'] ) == 'complete' ) {
        return true;
    }
    return null;
}, 10000);

But now I'm facing a different error:

PHPUnit_Extensions_Selenium2TestCase_WebDriverException: java.util.ArrayList cannot be cast to java.util.HashMap

Could you advise on the correct way to use the execute method?

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