JezK

Edit File: last-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var testing_1 = require("rxjs/testing");
var operators_1 = require("rxjs/operators");
var rxjs_1 = require("rxjs");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('last', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should take the last value of an observable', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a----b--c--|   ');
            var e1subs = '  ^------------!   ';
            var expected = '-------------(c|)';
            expectObservable(e1.pipe((0, operators_1.last)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should error on nothing sent but completed', 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.last)())).toBe(expected, null, new rxjs_1.EmptyError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should error on empty', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '#   ';
            expectObservable(e1.pipe((0, operators_1.last)())).toBe(expected, null, new rxjs_1.EmptyError());
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should go on forever on never', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.last)())).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.last)(function (value) { return value === 'b'; }, undefined))).toBe(expected, { U: undefined });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return last element matches with predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--a--b--|   ');
            var e1subs = '  ^-------------!   ';
            var expected = '--------------(b|)';
            expectObservable(e1.pipe((0, operators_1.last)(function (value) { return value === 'b'; }))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing explicitly and early', 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.last)()), 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.last)(), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return a default value if no element found', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '(a|)';
            expectObservable(e1.pipe((0, operators_1.last)(null, 'a'))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not return default value if an element is found', 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 = '    ----------------(d|)';
            expectObservable(e1.pipe((0, operators_1.last)(null, 'x'))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when predicate throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('--a--^---b---c---d---e--|');
            var e1subs = '     ^-------!           ';
            var expected = '   --------#           ';
            var predicate = function (x) {
                if (x === 'c') {
                    throw 'error';
                }
                else {
                    return false;
                }
            };
            expectObservable(e1.pipe((0, operators_1.last)(predicate))).toBe(expected);
            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.last)())
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.last)(function (foo) { return foo.bar === 'name'; }))
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.last)(isBar))
                .subscribe(function (x) { return x.bar; });
            var foobar = new Foo();
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.last)())
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.last)(function (foobar) { return foobar.bar === 'name'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.last)(isBaz))
                .subscribe(function (x) { return x.baz; });
            var barish = { bar: 'quack', baz: 42 };
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.last)())
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.last)(function (x) { return x.bar === 'quack'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.last)(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.last)()).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.last)(null)).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.last)(undefined)).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.last)(isString)).subscribe(function (s) { return s.length; });
            xs.pipe((0, operators_1.last)(function (x) { return typeof x === 'string'; })).subscribe(function (x) { return x; });
        }
    });
});
//# sourceMappingURL=last-spec.js.map

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