Some examples of how to use helper methods for tests:
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1. oxTestModules::initClass( $sModulePath, $sModuleClass, $sParentClass )

    Autoloads the defined module class, extended with the "parent class".
    The module path parameter should point directly to the module directory where the file is.

    Example:
    ...
    oxTestModules::initClass( "module_name/", "testModule", "oxOrder" );
    ...

2.