Cannot read attribute with the name "must" of an object if unit.js is used

[baloghz]

In the following js code the must parameter of the myObj object only appears in the console, if we not use the unit.js package (ver 0.1.8):

require("unit.js"); // delete this line and the result will be good

var myObj = {
    "parameter": "value"
};
myObj.must = "must_value";
console.log(JSON.stringify(myObj, undefined, 2));

Is it a bug, or is it a well-known feature of unit.js, which has to be taken into account when testing with it?

Thanks for the answer!

[Nicolab]

I look in the evening but you should upgrade to the last version (v1.1.0). No break in the API. your tests will not be affected.

[Nicolab]

It's not a bug, this a non enumerable property added by MustJS to be able to make assertions like
myObj.parameter.must.be.string();

To cancel it:

delete Object.prototype.must;

And it's ok

var test = require('unit.js');

delete Object.prototype.must;

var myObj = {
    'parameter': 'value'
};

console.log(JSON.stringify(myObj, undefined, 2));

Subsequently MustJS can be used in this way:

test.must(myObj.parameter).be.string();

ShouldJS done the same, so to remove the 2 monkey patches:

var test = require('unit.js');

delete Object.prototype.must;
delete Object.prototype.should;

For the nonce, I just added these details in the doc http://unitjs.com/guide/must-js.html

Thanks!

[baloghz]

Thank you very much for your detailed answer!