async-test-util
Version:
Util-functions that are be useful in async tests
47 lines • 2.07 kB
JavaScript
import isPromise from './is-promise';
import { oneOfArrayNotInString } from './utils';
/**
* async version of assert.throws
* @param {function} test
* @param {Error|TypeError|string} [error=Error] error
* @param {?string} [contains=''] contains
* @return {Promise} [description]
*/
export default function assertThrows(test) {
var error = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Error;
var contains = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [];
if (!Array.isArray(contains)) contains = [contains];
var shouldErrorName = typeof error === 'string' ? error : error.name;
var nonThrown = new Error('util.assertThrowsAsync(): Missing rejection' + (error ? ' with ' + error.name : ''));
var ensureErrorMatches = function ensureErrorMatches(error) {
// wrong type
if (error.constructor.name != shouldErrorName) {
return new Error("\n util.assertThrowsAsync(): Wrong Error-type\n - is : " + error.constructor.name + "\n - should: " + shouldErrorName + "\n - error: " + error.toString() + "\n - stack: " + error.stack + "\n ");
}
// check if contains
var errorString = error.toString();
if (contains.length > 0 && oneOfArrayNotInString(contains, errorString)) {
return new Error("\n util.assertThrowsAsync(): Error does not contain\n - should contain: " + contains + "\n - is string: " + error.toString() + "\n ");
}
return false;
};
return new Promise(function (res, rej) {
var val;
try {
val = test();
} catch (err) {
var wrong = ensureErrorMatches(err);
if (wrong) rej(wrong);else res(err);
return;
}
if (isPromise(val)) {
val.then(function () {
// has not thrown
rej(nonThrown);
})["catch"](function (err) {
var wrong = ensureErrorMatches(err);
if (wrong) rej(wrong);else res(err);
});
} else rej(nonThrown);
});
}