JezK

Edit File: first-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var observableMatcher_1 = require("../helpers/observableMatcher");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var rxjs_1 = require("rxjs");
describe('first', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should take the first value of an observable with many values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----a--b--c---d---|');
            var e1subs = '  ^----!              ';
            var expected = '-----(a|)           ';
            expectObservable(e1.pipe((0, operators_1.first)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should take the first value of an observable with one value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ---(a|)');
            var e1subs = '  ^--!   ';
            var expected = '---(a|)';
            expectObservable(e1.pipe((0, operators_1.first)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow undefined as a default value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -----a--a---a-|   ');
            var e1subs = '  ^-------------!   ';
            var expected = '--------------(U|)';
            expectObservable(e1.pipe((0, operators_1.first)(function (value) { return value === 'b'; }, undefined))).toBe(expected, { U: undefined });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should error on empty', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^----|');
            var e1subs = '     ^----!';
            var expected = '   -----#';
            expectObservable(e1.pipe((0, operators_1.first)())).toBe(expected, null, new rxjs_1.EmptyError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return the default value if source observable was empty', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-----^----|   ');
            var e1subs = '     ^----!   ';
            var expected = '   -----(a|)';
            expectObservable(e1.pipe((0, operators_1.first)(null, 'a'))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should only emit one value in recursive cases', function () {
        var subject = new rxjs_1.Subject();
        var results = [];
        subject.pipe((0, operators_1.first)()).subscribe(function (x) {
            results.push(x);
            subject.next(x + 1);
        });
        subject.next(0);
        (0, chai_1.expect)(results).to.deep.equal([0]);
    });
    it('should propagate error from the source observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('---^---#');
            var e1subs = '   ^---!';
            var expected = ' ----#';
            expectObservable(e1.pipe((0, operators_1.first)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should go on forever on never', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--^-------');
            var e1subs = '  ^-------';
            var expected = '--------';
            expectObservable(e1.pipe((0, operators_1.first)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing early and explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^-----b----c---d--|');
            var e1subs = '     ^--!               ';
            var expected = '   ----               ';
            var unsub = '      ---!               ';
            expectObservable(e1.pipe((0, operators_1.first)()), unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^-----b----c---d--|');
            var e1subs = '     ^--!               ';
            var expected = '   ----               ';
            var unsub = '      ---!               ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.first)(), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should unsubscribe when the first value is received', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b---c-|');
            var e1subs = '  ^-!         ';
            var t = time('    --|       ');
            var expected = '----(a|)    ';
            var result = e1.pipe((0, operators_1.first)(), (0, operators_1.delay)(t));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return first value that matches a predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a-^--b--c--a--c--|');
            var e1subs = '    ^-----!         ';
            var expected = '  ------(c|)      ';
            expectObservable(e1.pipe((0, operators_1.first)(function (value) { return value === 'c'; }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return first value that matches a predicate for odd numbers', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = { a: 1, b: 2, c: 3, d: 4, e: 5 };
            var e1 = hot('--a-^--b--c--d--e--|', values);
            var e1subs = '    ^-----!         ';
            var expected = '  ------(c|)      ';
            expectObservable(e1.pipe((0, operators_1.first)(function (x) { return x % 2 === 1; }))).toBe(expected, { c: 3 });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should error when no value matches the predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a-^--b--c--a--c--|');
            var e1subs = '    ^--------------!';
            var expected = '  ---------------#';
            expectObservable(e1.pipe((0, operators_1.first)(function (x) { return x === 's'; }))).toBe(expected, null, new rxjs_1.EmptyError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return the default value when no value matches the predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a-^--b--c--a--c--|   ');
            var e1subs = '    ^--------------!   ';
            var expected = '  ---------------(d|)';
            expectObservable(e1.pipe((0, operators_1.first)(function (x) { return x === 's'; }, 'd'))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate error when no value matches the predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a-^--b--c--a--#');
            var e1subs = '    ^-----------!';
            var expected = '  ------------#';
            expectObservable(e1.pipe((0, operators_1.first)(function (x) { return x === 's'; }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return first value that matches the index in the predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a-^--b--c--a--c--|');
            var e1subs = '    ^--------!      ';
            var expected = '  ---------(a|)   ';
            expectObservable(e1.pipe((0, operators_1.first)(function (_, i) { return i === 2; }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate error from predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = { a: 1, b: 2, c: 3, d: 4, e: 5 };
            var e1 = hot('--a-^--b--c--d--e--|', values);
            var e1subs = '    ^--------!      ';
            var expected = '  ---------#      ';
            var predicate = function (value) {
                if (value < 4) {
                    return false;
                }
                else {
                    throw 'error';
                }
            };
            expectObservable(e1.pipe((0, operators_1.first)(predicate))).toBe(expected, null, 'error');
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should support type guards without breaking previous behavior', function () {
        {
            var Foo = (function () {
                function Foo(bar, baz) {
                    if (bar === void 0) { bar = 'name'; }
                    if (baz === void 0) { baz = 42; }
                    this.bar = bar;
                    this.baz = baz;
                }
                return Foo;
            }());
            var isBar = function (x) { return x && x.bar !== undefined; };
            var isBaz = function (x) { return x && x.baz !== undefined; };
            var foo = new Foo();
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.first)())
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.first)(function (foo) { return foo.bar === 'name'; }))
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.first)(isBar))
                .subscribe(function (x) { return x.bar; });
            var foobar = new Foo();
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.first)())
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.first)(function (foobar) { return foobar.bar === 'name'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.first)(isBaz))
                .subscribe(function (x) { return x.baz; });
            var barish = { bar: 'quack', baz: 42 };
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.first)())
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.first)(function (x) { return x.bar === 'quack'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.first)(isBar))
                .subscribe(function (x) { return x.bar; });
        }
        {
            var xs = (0, rxjs_1.from)([1, 'aaa', 3, 'bb']);
            var isString = function (x) { return typeof x === 'string'; };
            xs.pipe((0, operators_1.first)()).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.first)(null)).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.first)(undefined)).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.first)(isString)).subscribe(function (s) { return s.length; });
            xs.pipe((0, operators_1.first)(function (x) { return typeof x === 'string'; })).subscribe(function (x) { return x; });
        }
    });
    it('should stop listening to a synchronous observable when unsubscribed', function () {
        var sideEffects = [];
        var synchronousObservable = new rxjs_1.Observable(function (subscriber) {
            for (var i = 0; !subscriber.closed && i < 10; i++) {
                sideEffects.push(i);
                subscriber.next(i);
            }
        });
        synchronousObservable.pipe((0, operators_1.first)(function (value) { return value === 2; })).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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