Tiny, but fully loaded test-runner.
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const isEq = require('@codefeathers/iseq');
const { stringify } = require('../../util/helpers');
const _assertPromise = require('./assertPromise');
const expectPromise = (pred, statement, options = {}) => a => (...b) => {
if(a && typeof a.then === 'function') {
return (
a
.then(x =>
_assertPromise(
pred(a, ...b),
statement(x, ...b)
)
)
.catch(e =>
options.shouldNotCatch
? _assertPromise(
pred(a, ...b),
statement(e, ...b)
)
: Promise.reject(e)
)
);
}
return _assertPromise(
pred(a, ...b),
statement(a, ...b)
);
};
const expect = thing => {
return ({
done : () => Promise.resolve(),
equal : expectPromise(
(a, b) => a === b,
(a, b) => `${a} is not equal to ${b}`,
)(thing),
deepEqual : expectPromise(
(a, b) => isEq(a, b),
(a, b) => `${stringify(a)} is not deeply equal to ${stringify(b)}`,
)(thing),
isTrue : expectPromise(
a => a === true,
a => `${a} is not true`,
)(thing),
hasProp : expectPromise(
(a, b) => b in a,
(a, b) => `Property ${b} does not exist in ${stringify(a)}`,
)(thing),
hasPair : expectPromise(
(a, b, c) => a[b] === c,
(a, b, c) => `Pair <${b}, ${c}> does not exist in ${stringify(a)}`,
)(thing),
resolvesTo : expectPromise(
(a, b) => (a && typeof a.then === 'function')
? a.then(x => x === b ? Promise.resolve() : Promise.reject())
: Promise.reject(`${a} was not a Promise`),
(a, b) => `${a} does not resolve to ${b}`,
)(thing),
isPromise : expectPromise(
a => (a && typeof a.then === 'function')
? a.then(() => Promise.resolve()).catch(() => Promise.resolve())
: Promise.reject(),
a => `${a} is not a Promise`,
{ shouldNotCatch: true },
)(thing),
});
};
module.exports = expect;