angular-cn/modules/angular2/test/pipes/async_pipe_spec.ts

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import {
ddescribe,
describe,
it,
iit,
xit,
expect,
beforeEach,
afterEach,
AsyncTestCompleter,
inject,
SpyObject
} from 'angular2/test_lib';
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import {SpyChangeDetectorRef} from './spies';
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import {isBlank} from 'angular2/src/core/facade/lang';
import {WrappedValue} from 'angular2/change_detection';
import {AsyncPipe} from 'angular2/pipes';
import {
EventEmitter,
ObservableWrapper,
PromiseWrapper,
TimerWrapper
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} from 'angular2/src/core/facade/async';
import {DOM} from 'angular2/src/core/dom/dom_adapter';
export function main() {
describe("AsyncPipe", () => {
describe('Observable', () => {
var emitter;
var pipe;
var ref;
var message = new Object();
beforeEach(() => {
emitter = new EventEmitter();
ref = new SpyChangeDetectorRef();
pipe = new AsyncPipe(ref);
});
describe("transform", () => {
it("should return null when subscribing to an observable",
() => { expect(pipe.transform(emitter)).toBe(null); });
it("should return the latest available value wrapped",
inject([AsyncTestCompleter], (async) => {
pipe.transform(emitter);
ObservableWrapper.callNext(emitter, message);
TimerWrapper.setTimeout(() => {
expect(pipe.transform(emitter)).toEqual(new WrappedValue(message));
async.done();
}, 0)
}));
it("should return same value when nothing has changed since the last call",
inject([AsyncTestCompleter], (async) => {
pipe.transform(emitter);
ObservableWrapper.callNext(emitter, message);
TimerWrapper.setTimeout(() => {
pipe.transform(emitter);
expect(pipe.transform(emitter)).toBe(message);
async.done();
}, 0)
}));
it("should dispose of the existing subscription when subscribing to a new observable",
inject([AsyncTestCompleter], (async) => {
pipe.transform(emitter);
var newEmitter = new EventEmitter();
expect(pipe.transform(newEmitter)).toBe(null);
// this should not affect the pipe
ObservableWrapper.callNext(emitter, message);
TimerWrapper.setTimeout(() => {
expect(pipe.transform(newEmitter)).toBe(null);
async.done();
}, 0)
}));
it("should request a change detection check upon receiving a new value",
inject([AsyncTestCompleter], (async) => {
pipe.transform(emitter);
ObservableWrapper.callNext(emitter, message);
TimerWrapper.setTimeout(() => {
expect(ref.spy('requestCheck')).toHaveBeenCalled();
async.done();
}, 0)
}));
});
describe("onDestroy", () => {
it("should do nothing when no subscription",
() => { expect(() => pipe.onDestroy()).not.toThrow(); });
it("should dispose of the existing subscription", inject([AsyncTestCompleter], (async) => {
pipe.transform(emitter);
pipe.onDestroy();
ObservableWrapper.callNext(emitter, message);
TimerWrapper.setTimeout(() => {
expect(pipe.transform(emitter)).toBe(null);
async.done();
}, 0)
}));
});
});
describe("Promise", () => {
var message = new Object();
var pipe;
var completer;
var ref;
// adds longer timers for passing tests in IE
var timer = (!isBlank(DOM) && DOM.getUserAgent().indexOf("Trident") > -1) ? 50 : 0;
beforeEach(() => {
completer = PromiseWrapper.completer();
ref = new SpyChangeDetectorRef();
pipe = new AsyncPipe(ref);
});
describe("transform", () => {
it("should return null when subscribing to a promise",
() => { expect(pipe.transform(completer.promise)).toBe(null); });
it("should return the latest available value", inject([AsyncTestCompleter], (async) => {
pipe.transform(completer.promise);
completer.resolve(message);
TimerWrapper.setTimeout(() => {
expect(pipe.transform(completer.promise)).toEqual(new WrappedValue(message));
async.done();
}, timer)
}));
it("should return unwrapped value when nothing has changed since the last call",
inject([AsyncTestCompleter], (async) => {
pipe.transform(completer.promise);
completer.resolve(message);
TimerWrapper.setTimeout(() => {
pipe.transform(completer.promise);
expect(pipe.transform(completer.promise)).toBe(message);
async.done();
}, timer)
}));
it("should dispose of the existing subscription when subscribing to a new promise",
inject([AsyncTestCompleter], (async) => {
pipe.transform(completer.promise);
var newCompleter = PromiseWrapper.completer();
expect(pipe.transform(newCompleter.promise)).toBe(null);
// this should not affect the pipe, so it should return WrappedValue
completer.resolve(message);
TimerWrapper.setTimeout(() => {
expect(pipe.transform(newCompleter.promise)).toBe(null);
async.done();
}, timer)
}));
it("should request a change detection check upon receiving a new value",
inject([AsyncTestCompleter], (async) => {
pipe.transform(completer.promise);
completer.resolve(message);
TimerWrapper.setTimeout(() => {
expect(ref.spy('requestCheck')).toHaveBeenCalled();
async.done();
}, timer)
}));
describe("onDestroy", () => {
it("should do nothing when no source",
() => { expect(() => pipe.onDestroy()).not.toThrow(); });
it("should dispose of the existing source", inject([AsyncTestCompleter], (async) => {
pipe.transform(completer.promise);
expect(pipe.transform(completer.promise)).toBe(null);
completer.resolve(message)
TimerWrapper.setTimeout(() => {
expect(pipe.transform(completer.promise)).toEqual(new WrappedValue(message));
pipe.onDestroy();
expect(pipe.transform(completer.promise)).toBe(null);
async.done();
}, timer);
}));
});
});
});
describe('null', () => {
it('should return null when given null', () => {
var pipe = new AsyncPipe(null);
expect(pipe.transform(null, [])).toEqual(null);
});
});
describe('other types', () => {
it('should throw when given an invalid object', () => {
var pipe = new AsyncPipe(null);
expect(() => pipe.transform(<any>"some bogus object", [])).toThrowError();
});
});
});
}