ES Bind Operator Throws SyntaxError When Test Failing

[ghost]

Description

I was trying to use the ES bind operator in my test files.
If I transpile the code in the Babel REPL and try it with the resulting ES5 code all is working fine so I think it must be something with AVAs or power-asserts internal transpilation.
After that I tried to make a reproduction and noticed that the SyntaxError is only there if the test fails.

Test Source

import test from 'ava'
import validate from './validate.js'

test('should be a function', t => {
    t.is(typeof validate, 'function')
})

test('should wrap a value in a validation object', t => {
    t.deepEqual(true::validate('foo'), {
        valid: true,
        value: true,
        name: 'bar'
    }, 'boolean')
})

validate.js:

function validate(name) {
    return {
        name,
        valid: true,
        value: this
    }
}

export default validate

Error Message & Stack Trace

> ava


 ⠏ required › should be a function

   1 passed
   1 failed/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:945
  throw err;
  ^

SyntaxError: Unexpected token (1:16)
    at Parser.pp.raise (/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:943:13)
    at Parser.pp.unexpected (/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:1503:8)
    at Parser.pp.expect (/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:1497:26)
    at Parser.pp.parseExprList (/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:643:12)
    at Parser.pp.parseSubscripts (/Users/konstantinpschera/Development/Projects/feed/validation/node_modules/acorn/dist/acorn.js:240:29)
npm ERR! Test failed.  See above for more details.

Config

package.json:

{
  "ava": {
    "require": [
      "babel-register"
    ],
    "failFast": true,
    "babel": "inherit"
  }
}

.babelrc:

{
    "presets": ["es2015", "stage-0"]
}

Command-Line Arguments

ava

Relevant Links

• https://github.com/tim-mcgee/ava-es-bind

Environment

Mac OSX El Capitan (Version: 10.11.5 (15F34))
darwin 15.5.0
NPM v3.9.3
Node.js v6.2.0
AVA v0.15.1

[sindresorhus]

@twada Is there any way power-assert can gracefully handle failures like this? Instead of hard failing, it would just not decorate the output, and include a message on why. That way it's still usable.

[twada]

@sindresorhus I'm going to ship new power-assert-runtime soon. It'll fix problems like this entirely.

[sotojuan]

Did this fix the issue? Issue creator deleted his account.

[twada]

Will be fixed when #903 is released.

[adjavaherian]

Just noticed what might be a related issue while testing a React component with Enzyme and Ava's native assertions.

Below, CustomOption is a child component, and I expect wrapper.contains to return true or false:

test('renders children when passed in', t => {
    const wrapper = shallow(
        <Select>
            <CustomOption />
        </Select>
    );
    t.true(wrapper.contains(<CustomOption />));
});

But I end up with this and NPM bails out when the watcher returns 1:

SyntaxError: Unexpected token (1:24)
    at Parser.pp.raise (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:923:13)
    at Parser.pp.unexpected (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:1490:8)
    at Parser.pp.parseExprAtom (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:333:12)
    at Parser.parseExprAtom (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn-es7-plugin/acorn-es7-plugin.js:136:30)
    at Parser.pp.parseExprSubscripts (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:228:19)
    at Parser.pp.parseMaybeUnary (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:207:17)
    at Parser.pp.parseExprOps (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:154:19)
    at Parser.pp.parseMaybeConditional (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:136:19)
    at Parser.pp.parseMaybeAssign (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:112:19)
    at Parser.pp.parseExprList (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:660:23)
    at Parser.pp.parseSubscripts (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:252:29)
    at Parser.pp.parseExprSubscripts (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:231:15)
    at Parser.pp.parseMaybeUnary (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:207:17)
    at Parser.pp.parseExprOps (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:154:19)
    at Parser.pp.parseMaybeConditional (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:136:19)
    at Parser.pp.parseMaybeAssign (/Users/Amir/Desktop/Nestio/pam/node_modules/acorn/dist/acorn.js:112:19)

Conversely, the following is fine.

test('renders children when passed in', t => {
    const wrapper = shallow(
        <Select>
            <CustomOption />
        </Select>
    );

    const truthy = wrapper.contains(<CustomOption />);
    t.true(truthy);
});

CLI

CONFIG=$(pwd)/webpack/webpack.test.config.js BABEL_DISABLE_CACHE=1 NODE_ENV=ava ava "--watch"

Relevant Links

https://github.com/istarkov/babel-plugin-webpack-loaders

ENV

Ava 0.15.2
node 4.4.5

[novemberborn]

I'm assuming this has been fixed, since #903 was merged.