in spec/helpers.js [135:150]
module.exports.setPluginSpec = function (appPath, plugin, spec) {
appPath = getConfigPath(appPath);
const parser = new ConfigParser(appPath);
const p = parser.getPlugin(plugin);
let variables = [];
if (p) {
parser.removePlugin(p.name);
if (p.variables.length && p.variables.length > 0) {
variables = p.variables;
}
}
parser.addPlugin({ name: plugin, spec }, variables);
parser.write();
};