const { TestScheduler } = require("rxjs/testing");
const { map, take, delay, mapTo, catchError } = require("rxjs/operators");
const { concat, from, of, interval } = require("rxjs");
describe("Marble testing in Rxjs", () => {
let testScheduler;
beforeEach(() => {
testScheduler = new TestScheduler((actual, expected) => {
expect(actual).toEqual(expected);
});
});
it("should convert ASCII diagrams into observables", () => {
testScheduler.run((helpers) => {
const { cold, expectObservable } = helpers;
const source$ = cold("--a-b---c");
const expected = "--a-b---c";
expectObservable(source$).toBe(expected);
});
});
it("should allow configuration of emitted values", () => {
testScheduler.run((helpers) => {
const { cold, expectObservable } = helpers;
const source$ = cold("--a-b---c", { a: 1, b: 2, c: 3 });
const final$ = source$.pipe(map((val) => val * 10));
const expected = "--a-b---c";
expectObservable(final$).toBe(expected, { a: 10, b: 20, c: 30 });
});
});
it("should let you identify subscription points", () => {
testScheduler.run((helpers) => {
const { cold, expectObservable, expectSubscriptions } = helpers;
const source$ = cold("-a---b-|");
const second$ = cold("-c---d-|");
const final$ = concat(source$, second$);
const expected = "-a---b--c---d-|";
const sourceExpectedSub = "^-- -- --!";
const secondExpectedSub = "-- -- -- -^-- -- --!";
expectObservable(final$).toBe(expected);
expectSubscriptions(source$.subscriptions).toBe(sourceExpectedSub);
expectSubscriptions(second$.subscriptions).toBe(secondExpectedSub);
});
});
it("should let you test hot observables", () => {
testScheduler.run((helpers) => {
const { hot, expectObservable } = helpers;
// in this case, hot == cold
const source$ = hot("-a-b--c");
const expected = "-a-b--c";
expectObservable(source$).toBe(expected);
// ^: means there is an subsrcitpion comes in
const source2$ = hot("-a-b-^-c");
const expected2 = "--c";
expectObservable(source2$).toBe(expected2);
// take completed case
const final$ = source2$.pipe(take(1));
const expected3 = "--(c|)";
expectObservable(final$).toBe(expected3);
});
});
it("should let you test asychronous operations", () => {
testScheduler.run((helpers) => {
const { expectObservable } = helpers;
const source$ = from([1, 2, 3]);
const expected = "(abc|)";
expectObservable(source$).toBe(expected, { a: 1, b: 2, c: 3 });
});
});
it("should let you test asynchronous operations", () => {
testScheduler.run((helpers) => {
const { expectObservable } = helpers;
const source$ = from([1, 2, 3]);
const final$ = source$.pipe(delay(5));
const expected = "-- -- -(abc|)";
expectObservable(final$).toBe(expected, { a: 1, b: 2, c: 3 });
const final2$ = source$.pipe(delay(2001));
// 2s: 2 seconds
const expected2 = "2s -(abc|)";
expectObservable(final2$).toBe(expected2, { a: 1, b: 2, c: 3 });
});
});
it("should let you test erros and error message", () => {
testScheduler.run((helpers) => {
const { expectObservable } = helpers;
const source$ = of(
{ firstName: "Joe", lastName: "Smith" },
undefined // trigger error as an invalid user
).pipe(
map(({ firstName, lastName }) => `${firstName} ${lastName}`),
catchError(() => {
throw new Error("Invalid user!");
})
);
const expected = "(a#)";
expectObservable(source$).toBe(
expected,
{ a: "Joe Smith" },
new Error("Invalid user!")
);
});
});
it("should let you test snapshots of streams that do not complete", () => {
testScheduler.run((helpers) => {
const { expectObservable } = helpers;
const source$ = interval(1000).pipe(map((val) => `${val + 1}sec`));
const expected = "1s a 999ms b 999ms c";
const unsubscribe = "3999ms !";
expectObservable(source$, unsubscribe).toBe(expected, {
a: "1sec",
b: "2sec",
c: "3sec",
});
});
});
});
原文地址:http://www.cnblogs.com/Answer1215/p/16792904.html
1. 本站所有资源来源于用户上传和网络,如有侵权请邮件联系站长!
2. 分享目的仅供大家学习和交流,请务用于商业用途!
3. 如果你也有好源码或者教程,可以到用户中心发布,分享有积分奖励和额外收入!
4. 本站提供的源码、模板、插件等等其他资源,都不包含技术服务请大家谅解!
5. 如有链接无法下载、失效或广告,请联系管理员处理!
6. 本站资源售价只是赞助,收取费用仅维持本站的日常运营所需!
7. 如遇到加密压缩包,默认解压密码为"gltf",如遇到无法解压的请联系管理员!
8. 因为资源和程序源码均为可复制品,所以不支持任何理由的退款兑现,请斟酌后支付下载
声明:如果标题没有注明"已测试"或者"测试可用"等字样的资源源码均未经过站长测试.特别注意没有标注的源码不保证任何可用性