JezK

Edit File: find-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var observableMatcher_1 = require("../helpers/observableMatcher");
var rxjs_1 = require("rxjs");
describe('find', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    function truePredicate(x) {
        return true;
    }
    it('should return matching element from source emits single element', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = { a: 3, b: 9, c: 15, d: 20 };
            var e1 = hot('  ---a--b--c--d---|', values);
            var e1subs = '  ^--------!       ';
            var expected = '---------(c|)    ';
            var predicate = function (x) {
                return x % 5 === 0;
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate))).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not emit if source does not emit', 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.find)(truePredicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return undefined if source is empty to match predicate', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '(x|)';
            var result = e1.pipe((0, operators_1.find)(truePredicate));
            expectObservable(result).toBe(expected, { x: undefined });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return matching element from source emits single element', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--|');
            var e1subs = '  ^-!   ';
            var expected = '--(a|)';
            var predicate = function (value) {
                return value === 'a';
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return matching element from source emits multiple elements', 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 = '-----(b|)   ';
            var predicate = function (value) {
                return value === 'b';
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should work with a custom thisArg', 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 = '-----(b|)   ';
            var finder = {
                target: 'b',
            };
            var predicate = function (value) {
                return value === this.target;
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate, finder))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should return undefined if element does not match with predicate', 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 = '-----------(x|)';
            var predicate = function (value) {
                return value === 'z';
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate))).toBe(expected, { x: undefined });
            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--|');
            var e1subs = '  ^-----!     ';
            var expected = '-------     ';
            var unsub = '   ------!     ';
            var result = e1.pipe((0, operators_1.find)(function (value) { return value === 'z'; }));
            expectObservable(result, 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--|');
            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.find)(function (value) { return value === 'z'; }), (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 predicate is matched', 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 = '-------(b|) ';
            var result = e1.pipe((0, operators_1.find)(function (value) { return value === 'b'; }), (0, operators_1.delay)(t));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise if source raise error while element does not match with predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--#');
            var e1subs = '  ^-------!';
            var expected = '--------#';
            var predicate = function (value) {
                return value === 'z';
            };
            expectObservable(e1.pipe((0, operators_1.find)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error if predicate throws error', 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 = '--#         ';
            var predicate = function (value) {
                throw 'error';
            };
            expectObservable(e1.pipe((0, operators_1.find)(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.find)(function (foo) { return foo.baz === 42; }))
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.find)(isBar))
                .subscribe(function (x) { return x.bar; });
            var foobar = new Foo();
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.find)(function (foobar) { return foobar.bar === 'name'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.find)(isBar))
                .subscribe(function (x) { return x.bar; });
            var barish = { bar: 'quack', baz: 42 };
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.find)(function (x) { return x.bar === 'quack'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.find)(isBar))
                .subscribe(function (bar) { return bar.bar; });
        }
        {
            var xs = (0, rxjs_1.from)([1, 'aaa', 3, 'bb']);
            var isString = function (x) { return typeof x === 'string'; };
            xs.pipe((0, operators_1.find)(isString)).subscribe(function (s) { return s.length; });
            xs.pipe((0, operators_1.find)(function (x) { return typeof x === 'number'; })).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.find)(function (x, i) { return typeof x === 'number' && x > i; })).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.find)(function (value) { return value === 2; })).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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