* performs an action on the test local plugin calling a method on a plugin
*
* @param {NightwatchBrowser} browser
* @param {string} buttonText the button which needs to be clicked formatted as pluginname:methodname, ie 'fileManager:writeFile'
* @param {any} methodResult can be a string expected or an object. it is the result of the method called. strings are evaluated as part of the result, an object should be exactly the result
* @param {any} eventResult can be a string expected or an object. it is the event generated by the method called. strings are evaluated as part of the result, an object should be exactly the result
* @param {any} payload can be a string expected or an object. it is the payload passed to the call