context.js
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var Q = require('../kew')
// test that contexts are propogated based on position
exports.testContextWithDelay = function (test) {
Q.resolve(true)
.setContext({id: 1})
.then(function (val, context) {
test.equal(context.id, 1, 'Should return the first context')
return Q.delay(500)
})
.setContext({id: 2})
.then(function (val, context) {
test.equal(context.id, 2, 'Should return the second context')
return Q.delay(500)
})
.clearContext()
.then(function (val, context) {
test.equal(typeof context, 'undefined', 'Should return an undefined context')
return Q.delay(500)
})
.setContext({id: 3})
.fin(test.done)
}
// test adding and removing contexts
exports.testGeneralContextFlow = function (test) {
Q.resolve(true)
// test no context exists
.then(function (val, context) {
test.equal(typeof context, 'undefined', 'Context should be undefined')
throw new Error()
})
.fail(function (e, context) {
test.equal(typeof context, 'undefined', 'Context should be undefined')
})
// set the context and mutate it
.setContext({counter: 1})
.then(function (val, context) {
test.equal(context.counter, 1, 'Counter should be 1')
context.counter++
})
.then(function (val, context) {
test.equal(context.counter, 2, 'Counter should be 2')
context.counter++
throw new Error()
})
.fail(function (e, context) {
test.equal(context.counter, 3, 'Counter should be 3')
})
// return a context
.then(function (val, context) {
return Q.resolve(false)
.setContext({counter: 0})
})
.then(function (val, context) {
test.equal(context.counter, 0, 'Counter should be 0')
throw new Error()
})
.fail(function (e, context) {
test.equal(context.counter, 0, 'Counter should be 0')
})
// returning a promise with a cleared context won't clear the parent context
.then(function (val, context) {
return Q.resolve(false).clearContext()
})
.then(function (val, context) {
test.equal(context.counter, 0, 'Counter should be 0')
throw new Error()
})
.fail(function (e, context) {
test.equal(context.counter, 0, 'Counter should be 0')
})
// test that clearing the context works
.clearContext()
.then(function (val, context) {
test.equal(typeof context, 'undefined', 'Context should be undefined')
throw new Error()
})
.fail(function (e, context) {
test.equal(typeof context, 'undefined', 'Context should be undefined')
})
.fin(test.done)
}