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test.js
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test.js
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'use strict';
var expect = require('chai').expect;
var liftp = require('./index').liftp;
var liftp1 = require('./index').liftp1;
var liftp2 = require('./index').liftp2;
var liftp3 = require('./index').liftp3;
var liftp4 = require('./index').liftp4;
var liftp5 = require('./index').liftp5;
var firstp = require('./index').firstp;
var secondp = require('./index').secondp;
var purep = require('./index').purep;
var reject = require('./index').reject;
var fmapp = require('./index').fmapp;
var voidp = require('./index').voidp;
var sequencep = require('./index').sequencep;
var traversep = require('./index').traversep;
var pipep = require('./index').pipep;
var filterp = require('./index').filterp;
var foldp = require('./index').foldp;
var mapError = require('./index').mapError;
var resolveError = require('./index').resolveError;
var toPromise = require('./index').toPromise;
var bimap = require('./index').bimap;
var unfoldp = require('./index').unfoldp;
var Promise = require('bluebird');
var add = function(a, b) {
return a + b;
};
var promiseShouldFail = function(promise) {
return new Promise(function(resolve, reject) {
promise.then(reject).catch(resolve);
});
};
describe('purep', function() {
it('should resolve', function() {
return purep(3).then(function(r) {
expect(r).to.equal(3);
});
});
});
describe('reject', function() {
it('should reject', function() {
return reject(new Error('new Error')).catch(function(error) {
expect(error.message).to.equal('new Error');
});
});
});
describe('liftp', function() {
it('should resolve', function() {
return liftp(add)(Promise.resolve(1), Promise.resolve(2))
.then(function(r) {
expect(r).to.equal(3);
});
});
it('fail first', function() {
return promiseShouldFail(liftp(add)(Promise.reject(1), Promise.resolve(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('fail second', function() {
return promiseShouldFail(liftp(add)(Promise.resolve(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(2);
});
});
it('fail both', function() {
return promiseShouldFail(liftp(add)(Promise.reject(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('should throw if type mismatch', function() {
return expect(function() {
liftp(123);
}).to.throw(TypeError);
});
});
describe('liftp1', function() {
it('resolve', function() {
return liftp1(function(user) {
return user.email;
})(Promise.resolve({ email: '[email protected]' }));
});
it('should throw if type mismatch', function() {
return expect(function() {
liftp1(123);
}).to.throw(TypeError);
});
});
describe('voidp', function() {
it('should resolve', function() {
return voidp(purep(12)).then(function(v) {
expect(v).to.equal(undefined);
});
});
it('should reject with same error', function() {
var err = new Error('should reject');
return voidp(reject(err)).catch(function(e) {
expect(e).to.equal(err);
});
});
});
describe('liftp2', function() {
it('resolve', function() {
return liftp2(function(a, b) {
return a + b;
})(Promise.resolve(2), Promise.resolve(3))
.then(function(r) {
expect(r).to.equal(5);
});
});
});
describe('liftp2', function() {
it('resolve', function() {
return liftp2(function(a, b) {
return a + b;
})(Promise.resolve(2), Promise.resolve(3))
.then(function(r) {
expect(r).to.equal(5);
});
});
});
describe('liftp3', function() {
it('resolve', function() {
return liftp3(function(a, b, c) {
return a + b + c;
})(Promise.resolve(2), Promise.resolve(3), Promise.resolve(4))
.then(function(r) {
expect(r).to.equal(9);
});
});
});
describe('liftp4', function() {
it('resolve', function() {
return liftp4(function(a, b, c, d) {
return a + b + c + d;
})(Promise.resolve(2), Promise.resolve(3), Promise.resolve(4), Promise.resolve(5))
.then(function(r) {
expect(r).to.equal(14);
});
});
});
describe('liftp5', function() {
it('resolve', function() {
return liftp5(function(a, b, c, d, e) {
return a + b + c + d + e;
})(Promise.resolve(2), Promise.resolve(3), Promise.resolve(4), Promise.resolve(5), Promise.resolve(6))
.then(function(r) {
expect(r).to.equal(20);
});
});
});
describe('firstp', function() {
it('resolve', function() {
return firstp(Promise.resolve(1), Promise.resolve(2))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('fail first', function() {
return promiseShouldFail(firstp(Promise.reject(1), Promise.resolve(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('fail second', function() {
return promiseShouldFail(firstp(Promise.resolve(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(2);
});
});
it('fail both', function() {
return promiseShouldFail(firstp(Promise.reject(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
});
describe('secondp', function() {
it('resolve', function() {
return secondp(Promise.resolve(1), Promise.resolve(2))
.then(function(r) {
expect(r).to.equal(2);
});
});
it('fail first', function() {
return promiseShouldFail(secondp(Promise.reject(1), Promise.resolve(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('fail second', function() {
return promiseShouldFail(secondp(Promise.resolve(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(2);
});
});
it('fail both', function() {
return promiseShouldFail(secondp(Promise.reject(1), Promise.reject(2)))
.then(function(r) {
expect(r).to.equal(1);
});
});
});
describe('validation', function() {
var query = function(email, password) {
return { email: email, password: password };
};
var notEmpty = function(field) {
return function(a) {
if (!a) {
return Promise.reject('Field ' + field + ' cannot be empty');
} else {
return Promise.resolve(a);
}
};
};
it('should resolve', function() {
var q = { email: '[email protected]', password: 'ppp' };
return liftp(query)(
secondp(notEmpty('email')(q.email), purep(q.email)),
secondp(notEmpty('password')(q.password), purep(q.password)))
.then(function(validQ) {
expect(validQ).to.eql(q);
});
});
it('should fail if mising field', function() {
var q = { email: '[email protected]', password: undefined };
return promiseShouldFail(liftp(query)(
secondp(notEmpty('email')(q.email), purep(q.email)),
secondp(notEmpty('password')(q.password), purep(q.password))))
.then(function(r) {
expect(r).to.equal('Field password cannot be empty');
});
});
});
describe('fmapp', function() {
it('should resolve', function() {
return fmapp(function(x) { return x * 3; })(Promise.resolve(1))
.then(function(r) {
expect(r).to.equal(3);
});
});
});
describe('sequencep', function() {
it('should resolve', function() {
return sequencep([Promise.resolve(1), Promise.resolve(2)])
.then(function(r) {
expect(r).to.eql([1, 2]);
});
});
it('should fail one', function() {
return promiseShouldFail(sequencep([Promise.reject(1), Promise.resolve(2)]))
.then(function(r) {
expect(r).to.equal(1);
});
});
it('should fail both', function() {
return promiseShouldFail(sequencep([Promise.reject(1), Promise.reject(2)]))
.then(function(r) {
expect(r).to.equal(1);
});
});
});
var resolveLater = function(a) {
return new Promise(function(resolve) {
setTimeout(function() {
resolve(a * 3);
}, 10);
});
};
describe('traversep', function() {
it('should resolve', function() {
return traversep(resolveLater)([1, 2, 3])
.then(function(r) {
expect(r).to.eql([3, 6, 9]);
});
});
});
describe('pipep', function() {
it('should resolve', function() {
return pipep([resolveLater, resolveLater])(1)
.then(function(r) {
expect(r).to.equal(9);
});
});
});
describe('filterp', function() {
var gt = function(a) {
return function(b) {
return Promise.resolve(b > a);
};
};
it('should resolve', function() {
var p = filterp(gt(3))([1,4,6,7]);
return p.then(function(arr) {
expect(arr).to.eql([4,6,7]);
});
});
it('should resolve for empty array', function() {
var p = filterp(gt(3))([]);
return p.then(function(arr) {
expect(arr).to.eql([]);
});
});
});
describe('foldp', function() {
var sum = function(b, a) {
return Promise.resolve(b + a);
};
it('should resolve', function() {
return foldp(sum)(1)([2, 3, 4])
.then(function(r) {
expect(r).to.equal(10);
});
});
it('should resolve when array is empty', function() {
return foldp(sum)(1)([])
.then(function(r) {
expect(r).to.equal(1);
});
});
});
describe('unfoldp', function() {
var iter = function(a) {
return a > 5 ? Promise.resolve(false)
: Promise.resolve([a, a + 1]);
};
it('should resolve', function() {
return unfoldp(iter)(1)
.then(function(r) {
expect(r).to.eql([1,2,3,4,5]);
});
});
it('should resolve when array is empty', function() {
return unfoldp(iter)(6)
.then(function(r) {
expect(r).to.eql([]);
});
});
});
describe('mapError', function() {
it('should fail with transformed error', function() {
var transformer = function(error) {
var newError = new Error('new Error');
newError.status = 400;
return newError;
};
var shouldFail = mapError(transformer)(Promise.reject(new Error('error')));
return promiseShouldFail(shouldFail).then(function(error) {
expect(error.status).to.equal(400);
expect(error.message).to.equal('new Error');
});
});
});
describe('resolveError', function() {
it('should resolve', function() {
var recoverFn = function(error) {
return 'resolved';
};
return resolveError(recoverFn)(Promise.reject(new Error('error')))
.then(function(r) {
expect(r).to.equal('resolved');
});
});
});
describe('toPromise', function() {
var validateGreaterThan0 = toPromise(function(a) {
return a > 0;
}, function(a) {
return new Error('value is not greater than 0');
});
it('should resolve', function() {
return validateGreaterThan0(10)
.then(function(r) {
expect(r).to.equal(10);
});
});
it('should fail', function() {
return promiseShouldFail(validateGreaterThan0(-10))
.then(function(error) {
expect(error.message).to.equal('value is not greater than 0');
});
});
});
describe('bimap', function() {
var add1OrReject = bimap(
function(n) {
return n + 1;
},
function(error) {
return Promise.reject(new Error('reject ' + error.message));
}
);
it('should resolve', function() {
return add1OrReject(Promise.resolve(2)).then(function(r) {
expect(r).to.equal(3);
});
});
it('should fail', function() {
return promiseShouldFail(add1OrReject(Promise.reject(new Error('NaN'))))
.then(function(error) {
expect(error.message).to.equal('reject NaN');
});
});
});
// (a, a) -> Bool
var equal = function(a1, a2) {
expect(a1).to.equal(a2);
};
// (Promise a, Promise a) -> Promise Bool
var promiseEq = liftp2(equal);
// a -> a
var identity = function(a) {
return a;
};
describe('Functor laws', function() {
it('identity law', function() {
var p = purep(3);
return promiseEq(
fmapp(identity)(p),
p);
});
it('composition law', function() {
var p = purep(3);
var add2 = function(a) {
return a + 2;
};
var mul3 = function(b) {
return b * 3;
};
return promiseEq(
fmapp(function(x) { return add2(mul3(x)); })(p),
fmapp(add2)(fmapp(mul3)(p)));
});
});
describe('Applicative laws', function() {
it('identity law', function() {
var p = purep(3);
return promiseEq(liftp(identity)(p), p);
});
it('homomorphism law', function() {
var p = purep(3);
var add2 = function(a) {
return a + 2;
};
return promiseEq(liftp(add2)(p), purep(add2(3)));
});
});