2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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var test = require('tape')
var Result = require('./index.js')
test('can create Ok', function t(assert) {
var v = Result.Ok(42)
assert.equal(!!v, true)
assert.equal(v.v, 42)
assert.end()
})
test('can check for Ok', function t(assert) {
var result = Result.Ok(42)
assert.equal(Result.isOk(result), true)
assert.equal(Result.Ok(result), 42)
assert.end()
})
test('check for Ok fails for Err', function t(assert) {
var result = Result.Err(new Error('foo'))
assert.equal(Result.isOk(result), false)
assert.equal(Result.Ok(result), undefined)
assert.end()
})
test('can create Err', function t(assert) {
var err = Result.Err(new Error('foo'))
assert.equal(!!err, true)
assert.equal(err.err.message, 'foo')
assert.end()
})
test('can check for Err', function t(assert) {
var result = Result.Err(new Error('foo'))
assert.equal(Result.isErr(result), true)
assert.equal(Result.Err(result).message, 'foo')
assert.end()
})
test('check for Err fails for Ok', function t(assert) {
var result = Result.Ok(42)
assert.equal(Result.isErr(result), false)
assert.equal(Result.Err(result), undefined)
assert.end()
})
test('Ok can support null value', function t(assert) {
var result = Result.Ok(null)
assert.equal(!!result, true)
assert.equal(result.v, null)
assert.equal(Result.isOk(result), true)
assert.equal(Result.Ok(result), null)
assert.equal(Result.isErr(result), false)
assert.equal(Result.Err(result), undefined)
assert.end()
})
test('Ok throws if you box undefined', function t(assert) {
assert.throws(function () {
Result.Ok(undefined)
}, /Cannot box `undefined` in Result.Ok/)
assert.end()
})
test('Err throws if you box non-error', function t(assert) {
assert.throws(function () {
Result.Err(42)
}, /Cannot box a non-error in Result.Err/)
assert.end()
})
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