spec-js/operators/max-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
/** @test {max} */
describe('Observable.prototype.max', function () {
asDiagram('max')('should find the max of values of an observable', function () {
var e1 = hot('--a--b--c--|', { a: 42, b: -1, c: 3 });
var subs = '^ !';
var expected = '-----------(x|)';
expectObservable(e1.max()).toBe(expected, { x: 42 });
expectSubscriptions(e1.subscriptions).toBe(subs);
});
it('should be never when source is never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.max()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should be zero when source is empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.max()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should be never when source doesn\'t complete', function () {
var e1 = hot('--x--^--y--');
var e1subs = '^ ';
var expected = '------';
expectObservable(e1.max()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should be completes when source doesn\'t have values', function () {
var e1 = hot('-x-^---|');
var e1subs = '^ !';
var expected = '----|';
expectObservable(e1.max()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should max the unique value of an observable', function () {
var e1 = hot('-x-^--y--|', { y: 42 });
var e1subs = '^ !';
var expected = '------(w|)';
expectObservable(e1.max()).toBe(expected, { w: 42 });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should max the values of an ongoing hot observable', function () {
var e1 = hot('--a-^-b--c--d--|', { a: 42, b: -1, c: 0, d: 666 });
var subs = '^ !';
var expected = '-----------(x|)';
expectObservable(e1.max()).toBe(expected, { x: 666 });
expectSubscriptions(e1.subscriptions).toBe(subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('--a--b--c--|', { a: 42, b: -1, c: 0 });
var unsub = ' ! ';
var subs = '^ ! ';
var expected = '------- ';
expectObservable(e1.max(), unsub).toBe(expected, { x: 42 });
expectSubscriptions(e1.subscriptions).toBe(subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var source = hot('--a--b--c--|', { a: 42, b: -1, c: 0 });
var subs = '^ ! ';
var expected = '------- ';
var unsub = ' ! ';
var result = source
.mergeMap(function (x) { return Observable.of(x); })
.max()
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected, { x: 42 });
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should max a range() source observable', function (done) {
Rx.Observable.range(1, 10000).max().subscribe(function (value) {
chai_1.expect(value).to.equal(10000);
}, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
});
it('should max a range().skip(1) source observable', function (done) {
Rx.Observable.range(1, 10).skip(1).max().subscribe(function (value) {
chai_1.expect(value).to.equal(10);
}, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
});
it('should max a range().take(1) source observable', function (done) {
Rx.Observable.range(1, 10).take(1).max().subscribe(function (value) {
chai_1.expect(value).to.equal(1);
}, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
});
it('should work with error', function () {
var e1 = hot('-x-^--y--z--#', { x: 1, y: 2, z: 3 }, 'too bad');
var e1subs = '^ !';
var expected = '---------#';
expectObservable(e1.max()).toBe(expected, null, 'too bad');
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should work with throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.max()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a constant predicate on an empty hot observable', function () {
var e1 = hot('-x-^---|');
var e1subs = '^ !';
var expected = '----|';
var predicate = function (x, y) {
return 42;
};
expectObservable(e1.max(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a constant predicate on an never hot observable', function () {
var e1 = hot('-x-^----');
var e1subs = '^ ';
var expected = '-----';
var predicate = function (x, y) {
return 42;
};
expectObservable(e1.max(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a constant predicate on a simple hot observable', function () {
var e1 = hot('-x-^-a-|', { a: 1 });
var e1subs = '^ !';
var expected = '----(w|)';
var predicate = function () {
return 42;
};
expectObservable(e1.max(predicate)).toBe(expected, { w: 1 });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a reverse predicate on observable with many values', function () {
var e1 = hot('-a-^-b--c--d-|', { a: 42, b: -1, c: 0, d: 666 });
var e1subs = '^ !';
var expected = '----------(w|)';
var predicate = function (x, y) {
return x > y ? -1 : 1;
};
expectObservable(e1.max(predicate)).toBe(expected, { w: -1 });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a predicate for string on observable with many values', function () {
var e1 = hot('-a-^-b--c--d-|');
var e1subs = '^ !';
var expected = '----------(w|)';
var predicate = function (x, y) {
return x > y ? -1 : 1;
};
expectObservable(e1.max(predicate)).toBe(expected, { w: 'b' });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a constant predicate on observable that throws', function () {
var e1 = hot('-1-^---#');
var e1subs = '^ !';
var expected = '----#';
var predicate = function () {
return 42;
};
expectObservable(e1.max(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a predicate that throws, on observable with many values', function () {
var e1 = hot('-1-^-2--3--|');
var e1subs = '^ ! ';
var expected = '-----# ';
var predicate = function (x, y) {
if (y === '3') {
throw 'error';
}
return x > y ? x : y;
};
expectObservable(e1.max(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
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