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test: increase util.callbackify() coverage #13705

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Jun 19, 2017
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test: increase util.callbackify() coverage #13705

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34 changes: 34 additions & 0 deletions test/parallel/test-util-callbackify.js
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Original file line number Diff line number Diff line change
Expand Up @@ -225,3 +225,37 @@ const values = [
})
);
}

{
// Verify that non-function inputs throw.
['foo', null, undefined, false, 0, {}, Symbol(), []].forEach((value) => {
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Tiny nit: could use values.filter(v => typeof v !== 'function')

assert.throws(() => {
callbackify(value);
}, common.expectsError({
code: 'ERR_INVALID_ARG_TYPE',
type: TypeError,
message: 'The "original" argument must be of type function'
}));
});
}

{
async function asyncFn() {
return await Promise.resolve(42);
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Nit: the return itself is already sufficient as the return value is implicitly wrapped in a promise. Therefore the await can be removed.

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Indeed, but that's the way to other tests are written (e.g. https://github.com/nodejs/node/blob/master/test/parallel/test-util-callbackify.js#L31)
The rationale was to make them actually async in timing, not just in signature.

}

const cb = callbackify(asyncFn);
const args = [];

// Verify that the last argument to the callbackified function is a function.
['foo', null, undefined, false, 0, {}, Symbol(), []].forEach((value) => {
args.push(value);
assert.throws(() => {
cb(...args);
}, common.expectsError({
code: 'ERR_INVALID_ARG_TYPE',
type: TypeError,
message: 'The "last argument" argument must be of type function'
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this output is a tiny bit unfortunate 🤷‍♂️ I should have covered this

}));
});
}