Get an array with the all the calls to the toolkits since image_test_reset() was called.
An array keyed by operation name ('load', 'save', 'settings', 'resize', 'rotate', 'crop', 'desaturate') with values being arrays of parameters passed to each call.
function image_test_get_all_calls() {
return variable_get('image_test_results', array());
}