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assert: support arrow functions in .throws() #3276

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Oct 8, 2015
Merged

assert: support arrow functions in .throws() #3276

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14 changes: 9 additions & 5 deletions lib/assert.js
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Original file line number Diff line number Diff line change
Expand Up @@ -268,13 +268,17 @@ function expectedException(actual, expected) {

if (Object.prototype.toString.call(expected) == '[object RegExp]') {
return expected.test(actual);
} else if (actual instanceof expected) {
return true;
} else if (expected.call({}, actual) === true) {
return true;
}

return false;
try {
if (actual instanceof expected) {
return true;
}
} catch (e) {
// Ignore. The instanceof check doesn't work for arrow functions.
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Nit: there are two white spaces between both sentences.

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You may have noticed that I do that in most places. It's called double spacing and religious wars have been fought over whether or not it's a good thing.

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Double spacing is spacing between lines... I think you guys are referring to the spaces after the period, in the comment? (maybe not; then please ignore this comment)

}

return expected.call({}, actual) === true;
}

function _throws(shouldThrow, block, expected, message) {
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4 changes: 4 additions & 0 deletions test/parallel/test-assert.js
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Expand Up @@ -465,4 +465,8 @@ testBlockTypeError(assert.doesNotThrow, null);
testBlockTypeError(assert.throws, undefined);
testBlockTypeError(assert.doesNotThrow, undefined);

// https://github.com/nodejs/node/issues/3275
assert.throws(() => { throw 'error'; }, err => err === 'error');
assert.throws(() => { throw Error(); }, err => err instanceof Error);

console.log('All OK');