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Make 'empty' throw on non-string primitives and functions #812

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merged 5 commits into from
Oct 1, 2016
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Make 'empty' throw on non-string primitives and functions #812

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89b9865
Make 'empty' throw on non-string primitives and functions
shvaikalesh Sep 30, 2016
ccc00bc
Update jsdoc
shvaikalesh Oct 1, 2016
92a40d4
improve error messages
shvaikalesh Oct 1, 2016
79e6fba
fix symbol to string coercion for Node 0.12
shvaikalesh Oct 1, 2016
a1c1dc4
use utils.inspect
shvaikalesh Oct 1, 2016
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26 changes: 21 additions & 5 deletions lib/chai/core/assertions.js
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Original file line number Diff line number Diff line change
Expand Up @@ -515,8 +515,8 @@ module.exports = function (chai, _) {
* ### .empty
*
* Asserts that the target's length is `0`. For arrays and strings, it checks
* the `length` property. For objects, it gets the count of
* enumerable keys.
* the `length` property. For non-function objects, it gets the count of own
* enumerable string keys.
*
* expect([]).to.be.empty;
* expect('').to.be.empty;
Expand All @@ -528,10 +528,26 @@ module.exports = function (chai, _) {
*/

Assertion.addProperty('empty', function () {
var obj = flag(this, 'object');
new Assertion(obj).to.exist;
var val = flag(this, 'object')
, itemsCount;

switch (_.type(val)) {
case 'array':
case 'string':
itemsCount = val.length;
break;
case 'function':
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This should handle generators too (because of recent updates to type-detect) and async function in the future.

var name = val.name ? ' ' + val.name : '';
throw new TypeError('.empty was passed a function' + name);
default:
if (val !== Object(val)) {
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Other option is to add case clause for other primitives' types.

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Great use of Object(). 😍

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That blew my mind to!

throw new TypeError('.empty was passed non-string primitive ' + String(val));
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We need String here because it special-cases symbols. Otherwise, they throw on ToString.

EDIT: oops, that fails in Node 0.12 because of partial implementation. Let's do toString.

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You could use the inspect utility.

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I think I'm okay without it since the error message is pretty self-explanatory.
Also, if you want to add that anyway, I wouldn't mind, just try using _.type(), since it may be more accurate.

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Ah, I just noticed you want to print the value of what was passed, not it's type.
Then @vieiralucas is right, the inspect utility would be ideal.

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_.type() is better IMO

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okay, so, if we're going to use type we need to rephrase the error message to something like:

.empty was passed non-string primitive of type ' + _.type(val)

PS.: Sorry for all this mess in the comments @shvaikalesh 😆

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Okay, calm down everyone hahahha:

THUMBS UP IF YOU VOTE FOR TYPE AND HEART THIS COMMENT IF YOU VOTE FOR INSPECT.
If we three vote there's no way this is going to be a tie.

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Okay, let's do type then. Or not. Huh, need to refresh the page to see new comments, like in good ol' times.

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I am for inspect because you can definitely tell primitive type by the value, but not otherwise. May save console.log typing for someone.

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Okay, so we're going for inspect.
Also, since inspect also adds delimiters which denote the type of the value (like [] for arrays and '' for strings), it is more complete.
Thanks for this @shvaikalesh!

LGTM!

}
itemsCount = Object.keys(val).length;
}

this.assert(
Object.keys(Object(obj)).length === 0
0 === itemsCount
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Is there any ESLint config we can add to the project? This will greatly improve contribution/review experience: yoda comparisons and comma-first are not quite popular and it would be awesome to automate codestyle checks.

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@shvaikalesh Yes, we thought about that too, we already discussed that here and we came to the conclusion that by moving all our code to separate repos with their own linting rules would be better, however, if you disagree you're welcome to share your thoughts with us 😄 .

, 'expected #{this} to be empty'
, 'expected #{this} not to be empty'
);
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47 changes: 41 additions & 6 deletions test/expect.js
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Expand Up @@ -680,28 +680,63 @@ describe('expect', function () {

err(function(){
expect(null).to.be.empty;
}, "expected null to exist");
}, ".empty was passed non-string primitive null");

err(function(){
expect(undefined).to.be.empty;
}, "expected undefined to exist");
}, ".empty was passed non-string primitive undefined");

err(function(){
expect().to.be.empty;
}, "expected undefined to exist");
}, ".empty was passed non-string primitive undefined");

err(function(){
expect(null).to.not.be.empty;
}, "expected null to exist");
}, ".empty was passed non-string primitive null");

err(function(){
expect(undefined).to.not.be.empty;
}, "expected undefined to exist");
}, ".empty was passed non-string primitive undefined");

err(function(){
expect().to.not.be.empty;
}, "expected undefined to exist");
}, ".empty was passed non-string primitive undefined");

err(function(){
expect(0).to.be.empty;
}, ".empty was passed non-string primitive 0");

err(function(){
expect(1).to.be.empty;
}, ".empty was passed non-string primitive 1");

err(function(){
expect(true).to.be.empty;
}, ".empty was passed non-string primitive true");

err(function(){
expect(false).to.be.empty;
}, ".empty was passed non-string primitive false");

if (typeof Symbol !== 'undefined') {
err(function(){
expect(Symbol()).to.be.empty;
}, ".empty was passed non-string primitive Symbol()");

err(function(){
expect(Symbol.iterator).to.be.empty;
}, ".empty was passed non-string primitive Symbol(Symbol.iterator)");
}

err(function(){
expect(function() {}).to.be.empty;
}, ".empty was passed a function");

if (FakeArgs.name === 'FakeArgs') {
err(function(){
expect(FakeArgs).to.be.empty;
}, ".empty was passed a function FakeArgs");
}
});

it('NaN', function() {
Expand Down
36 changes: 36 additions & 0 deletions test/should.js
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Expand Up @@ -657,6 +657,42 @@ describe('should', function() {
err(function(){
({foo: 'bar'}).should.be.empty;
}, "expected { foo: \'bar\' } to be empty");

err(function(){
(0).should.be.empty;
}, ".empty was passed non-string primitive 0");

err(function(){
(1).should.be.empty;
}, ".empty was passed non-string primitive 1");

err(function(){
true.should.be.empty;
}, ".empty was passed non-string primitive true");

err(function(){
false.should.be.empty;
}, ".empty was passed non-string primitive false");

if (typeof Symbol !== 'undefined') {
err(function(){
Symbol().should.be.empty;
}, ".empty was passed non-string primitive Symbol()");

err(function(){
Symbol.iterator.should.to.be.empty;
}, ".empty was passed non-string primitive Symbol(Symbol.iterator)");
}

err(function(){
(function() {}).should.be.empty;
}, ".empty was passed a function");

if (FakeArgs.name === 'FakeArgs') {
err(function(){
FakeArgs.should.be.empty;
}, ".empty was passed a function FakeArgs");
}
});

it('finite(value)', function() {
Expand Down