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feat(operator): adds inspect and inspectTime operators
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@trxcllnt @benlesh
trxcllnt authored and benlesh committed Feb 2, 2016
1 parent 90bf3f1 commit 54f957b
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329 changes: 329 additions & 0 deletions spec/operators/inspect-spec.js
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/* globals describe, it, expect, expectObservable, expectSubscription, hot, cold */
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
var Scheduler = Rx.Scheduler;
var Promise = require('promise');

describe('Observable.prototype.inspect()', function () {
it.asDiagram('inspect')('should emit the last value in each time window', function () {
var e1 = hot('-a-xy-----b--x--cxxx-|');
var e1subs = '^ !';
var e2 = cold( '----| ');
var e2subs = [' ^ ! ',
' ^ ! ',
' ^ ! '];
var expected = '-----y--------x-----x|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should delay the source if values are not emitted often enough', function () {
var e1 = hot('-a--------b-----c----|');
var e1subs = '^ !';
var e2 = cold( '----| ');
var e2subs = [' ^ ! ',
' ^ ! ',
' ^ ! '];
var expected = '-----a--------b-----c|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should inspect with duration Observable using next to close the duration', function () {
var e1 = hot('-a-xy-----b--x--cxxx-|');
var e1subs = '^ !';
var e2 = cold( '----x-y-z ');
var e2subs = [' ^ ! ',
' ^ ! ',
' ^ ! '];
var expected = '-----y--------x-----x|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should interrupt source and duration when result is unsubscribed early', function () {
var e1 = hot('-a-x-y-z-xyz-x-y-z----b--x-x-|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var e2 = cold( '-----x------------| ');
var e2subs = [' ^ ! ',
' ^ ! ',
' ^! '];
var expected = '------y-----z-- ';

var result = e1.inspect(function () { return e2; });

expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('-a-x-y-z-xyz-x-y-z----b--x-x-|');
var e1subs = '^ ! ';
var e2 = cold( '-----x------------| ');
var e2subs = [' ^ ! ',
' ^ ! ',
' ^! '];
var expected = '------y-----z-- ';
var unsub = ' ! ';

var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.inspect(function () { return e2; })
.mergeMap(function (x) { return Observable.of(x); });

expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should handle a busy producer emitting a regular repeating sequence', function () {
var e1 = hot('abcdefabcdefabcdefabcdefa|');
var e1subs = '^ !';
var e2 = cold('-----| ');
var e2subs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^!'];
var expected = '-----f-----f-----f-----f-|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should mirror source if durations are always empty', function () {
var e1 = hot('abcdefabcdefabcdefabcdefa|');
var e1subs = '^ !';
var e2 = cold('|');
var expected = 'abcdefabcdefabcdefabcdefa|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});

it('should emit no values if duration is a never', function () {
var e1 = hot('----abcdefabcdefabcdefabcdefa|');
var e1subs = '^ !';
var e2 = cold('-');
var e2subs = ' ^ !';
var expected = '-----------------------------|';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should unsubscribe duration Observable when source raise error', function () {
var e1 = hot('----abcdefabcdefabcdefabcdefa#');
var e1subs = '^ !';
var e2 = cold('-');
var e2subs = ' ^ !';
var expected = '-----------------------------#';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should raise error as soon as just-throw duration is used', function () {
var e1 = hot('----abcdefabcdefabcdefabcdefa|');
var e1subs = '^ ! ';
var e2 = cold('#');
var e2subs = ' (^!) ';
var expected = '----(-#) ';

var result = e1.inspect(function () { return e2; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should inspect using durations of varying lengths', function () {
var e1 = hot('abcdefabcdabcdefghabca| ');
var e1subs = '^ ! ';
var e2 = [cold('-----| '),
cold( '---| '),
cold( '-------| '),
cold( '--| '),
cold( '----|')];
var e2subs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^! '];
var expected = '-----f---d-------h--c-| ';

var i = 0;
var result = e1.inspect(function () { return e2[i++]; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var j = 0; j < e2.length; j++) {
expectSubscriptions(e2[j].subscriptions).toBe(e2subs[j]);
}
});

it('should propagate error from duration Observable', function () {
var e1 = hot('abcdefabcdabcdefghabca| ');
var e1subs = '^ ! ';
var e2 = [cold('-----| '),
cold( '---| '),
cold( '-------# ')];
var e2subs = ['^ ! ',
' ^ ! ',
' ^ ! '];
var expected = '-----f---d-------# ';

var i = 0;
var result = e1.inspect(function () { return e2[i++]; });

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var j = 0; j < e2.length; j++) {
expectSubscriptions(e2[j].subscriptions).toBe(e2subs[j]);
}
});

it('should propagate error thrown from durationSelector function', function () {
var e1 = hot('abcdefabcdabcdefghabca| ');
var e1subs = '^ ! ';
var e2 = [cold('-----| '),
cold( '---| '),
cold( '-------| ')];
var e2subs = ['^ ! ',
' ^ ! '];
var expected = '-----f---d# ';

var i = 0;
var result = e1.inspect(function () {
if (i === 2) {
throw 'error';
}
return e2[i++];
});

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var j = 0; j < e2subs.length; j++) {
expectSubscriptions(e2[j].subscriptions).toBe(e2subs[j]);
}
});

it('should complete when source does not emit', function () {
var e1 = hot('-----|');
var subs = '^ !';
var expected = '-----|';
function durationSelector() { return cold('-----|'); }

expectObservable(e1.inspect(durationSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});

it('should raise error when source does not emit and raises error', function () {
var e1 = hot('-----#');
var subs = '^ !';
var expected = '-----#';
function durationSelector() { return cold('-----|'); }

expectObservable(e1.inspect(durationSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});

it('should handle an empty source', function () {
var e1 = cold('|');
var subs = '(^!)';
var expected = '|';
function durationSelector() { return cold('-----|'); }

expectObservable(e1.inspect(durationSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});

it('should handle a never source', function () {
var e1 = cold('-');
var subs = '^';
var expected = '-';
function durationSelector() { return cold('-----|'); }

expectObservable(e1.inspect(durationSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});

it('should handle a throw source', function () {
var e1 = cold('#');
var subs = '(^!)';
var expected = '#';
function durationSelector() { return cold('-----|'); }

expectObservable(e1.inspect(durationSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});

it('should inspect by promise resolves', function (done) {
var e1 = Observable.interval(10).take(5);
var expected = [0,1,2,3];

e1.inspect(function () {
return new Promise(function (resolve) { resolve(42); });
}).subscribe(
function (x) {
expect(x).toEqual(expected.shift()); },
function () {
done('should not be called');
},
function () {
expect(expected.length).toBe(0);
done();
}
);
});

it('should raise error when promise rejects', function (done) {
var e1 = Observable.interval(10).take(4);
var expected = [0,1,2];
var error = new Error('error');

e1.inspect(function (x) {
if (x === 4) {
return new Promise(function (resolve, reject) {reject(error);});
} else {
return new Promise(function (resolve) {resolve(42);});
}
}).subscribe(
function (x) {
expect(x).toEqual(expected.shift()); },
function (err) {
expect(err).toBe(error);
expect(expected.length).toBe(0);
done();
},
function () {
done('should not be called');
}
);
});
});
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