in module/geb-core/src/main/groovy/geb/Configuration.groovy [446:461]
NavigatorFactory createNavigatorFactory(Browser browser) {
def navigatorFactory = readValue("navigatorFactory", null)
if (navigatorFactory == null) {
new BrowserBackedNavigatorFactory(browser, getInnerNavigatorFactory())
} else {
if (navigatorFactory instanceof Closure) {
def result = navigatorFactory.call(browser)
if (result instanceof NavigatorFactory) {
return result
}
throw new InvalidGebConfiguration("navigatorFactory returned '${result}', it should be a NavigatorFactory implementation")
} else {
throw new InvalidGebConfiguration("navigatorFactory is '${navigatorFactory}', it should be a Closure that returns a NavigatorFactory implementation")
}
}
}