08-27-周三_17-09-29

node_modules/kew/test/context.js

@@ -0,0 +1,89 @@
+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)
+}