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const assert = require('assert')
const nodeify = require('../../../app/scripts/lib/nodeify')
describe('nodeify', function () {
const obj = {
foo: 'bar',
promiseFunc: function (a) {
const solution = this.foo + a
return Promise.resolve(solution)
},
}
it('should retain original context', function (done) {
const nodified = nodeify(obj.promiseFunc, obj)
nodified('baz', function (err, res) {
if (!err) {
assert.equal(res, 'barbaz')
done()
} else {
done(new Error(err.toString()))
}
})
})
it('no callback - should allow the last argument to not be a function', function (done) {
const nodified = nodeify(obj.promiseFunc, obj)
try {
nodified('baz')
done()
} catch (err) {
done(new Error('should not have thrown if the last argument is not a function'))
}
})
it('no callback - should asyncly throw an error if underlying function does', function (done) {
const nodified = nodeify(async () => { throw new Error('boom!') }, obj)
process.prependOnceListener('uncaughtException', function (err) {
assert.ok(err, 'got expected error')
assert.ok(err.message.includes('boom!'), 'got expected error message')
done()
})
try {
nodified('baz')
} catch (err) {
done(new Error('should not have thrown an error synchronously'))
}
})
it('sync functions - returns value', function (done) {
const nodified = nodeify(() => 42)
try {
nodified((err, result) => {
if (err) return done(new Error(`should not have thrown any error: ${err.message}`))
assert.equal(42, result, 'got expected result')
})
done()
} catch (err) {
done(new Error(`should not have thrown any error: ${err.message}`))
}
})
it('sync functions - handles errors', function (done) {
const nodified = nodeify(() => { throw new Error('boom!') })
try {
nodified((err, result) => {
if (result) return done(new Error('should not have returned any result'))
assert.ok(err, 'got expected error')
assert.ok(err.message.includes('boom!'), 'got expected error message')
})
done()
} catch (err) {
done(new Error(`should not have thrown any error: ${err.message}`))
}
})
})
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