Unable to run test: regeneratorRuntime is not defined

[AKSSINC]

Compiles ok, but when run test, see errors below.

ReferenceError: regeneratorRuntime is not defined
at ...\solidity-test-example\node_modules\solidity-test-util\lib\index.js:49:34
at Object. (...\solidity-test-example\node_modules\solidity-test-util\lib\index.js:85:4
at Module._compile (module.js:635:30)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Module.require (module.js:579:17)
at require (internal/module.js:11:18)
at Object. (...\solidity-test-example\test\CongressWithTestUtil.js:1:18)
at Module._compile (module.js:635:30)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Module.require (module.js:579:17)
at require (internal/module.js:11:18)
at ...\AppData\Roaming\npm\node_modules\truffle\node_modules\mocha\lib\mocha.js:231:27
at Array.forEach ()
at Mocha.loadFiles (...\AppData\Roaming\npm\node_modules\truffle\node_modules\mocha\lib\mocha.js:228:14)
at Mocha.run (...\AppData\Roaming\npm\node_modules\truffle\node_modules\mocha\lib\mocha.js:536:10)
at ...\AppData\Roaming\npm\node_modules\truffle\build\webpack:.-core\lib\test.js:125:1