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test.js
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test.js
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let test = require('blue-tape')
let map = require('./')
const addOne = (n) => Promise.resolve(n + 1)
const fail = () => Promise.reject(new Error('Forced Error'))
function delay (n) {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve(n)
}, n)
})
}
test('should map over a non-promise', (t) => {
return map([1], addOne).then(result => {
t.deepEquals(result, [2])
})
})
test('should map over multiple non-promised elements', (t) => {
return map([1, 1], addOne).then(result => {
t.deepEquals(result, [2, 2])
})
})
test('should map over a single promise', (t) => {
let given = delay(50)
return map([given], addOne).then(result => {
t.deepEquals(result, [51])
})
})
test('should map over multiple promises', (t) => {
let given = [delay(3), delay(0), delay(1)]
let expected = [4, 1, 2]
return map(given, addOne).then(result => {
t.deepEquals(result, expected)
})
})
test('should map over empty sequence', (t) => {
let given = []
let expected = []
return map(given, addOne).then(result => {
t.deepEquals(result, expected)
}).catch(t.notOk)
})
test('should fail when mapping fails', (t) => {
let given = [delay(3), delay(0), delay(1)]
return map(given, fail).then(t.notOk).catch(t.ok)
})
test('should fail when a promise fails', (t) => {
let given = [delay(3), fail, delay(1)]
return map(given, addOne)
.then(t.ok)
.catch(t.notOk)
})