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