function shouldThrow(func, errorMessage) { | |
var errorThrown = false; | |
var error = null; | |
try { | |
func(); | |
} catch (e) { | |
errorThrown = true; | |
error = e; | |
} | |
if (!errorThrown) | |
throw new Error('not thrown'); | |
if (String(error) !== errorMessage) | |
throw new Error(`bad error: ${String(error)}`); | |
} | |
new Promise((resolve) => { | |
resolve(42); | |
}); | |
drainMicrotasks(); | |
shouldThrow(() => Promise(function () { }), `TypeError: Cannot call a constructor without |new|`) |