solidity-coverage/test/integration/projects/solc-6/buidler.config.js

const { loadPluginFile } = require("@nomiclabs/buidler/plugins-testing");
loadPluginFile(__dirname + "/../plugins/buidler.plugin");
usePlugin("@nomiclabs/buidler-truffle5");

module.exports={
  defaultNetwork: "buidlerevm",
  solc: {
    version: "0.6.2"
  }
};