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How to use the Assert in nodejs http://nodejs.org/api/assert.html
Tried
Assert.assert(1===1);
It throws following error
ReferenceError: Assert is not defined
How to use "assert". I am new to javascript and nodejs. The nodejs documentation explictly mentions some of the sections as a class Example:- http://nodejs.org/api/all.html#all_class_buffer_1. But Assert is not mentioned as a class. Then what is "Assert"?
748
Definition and Usage The assert module provides a way of testing expressions. If the expression evaluates to 0, or false, an assertion failure is being caused, and the program is terminated. This module was built to be used internally by Node.
For Node 10 and above, it's better to use strict assert which can be imported as named import and renamed for convenience as assert : import { strict as assert } from 'assert'; assert. ok(true); assert(true);
In test codes, assert module's assert. equal are heavily used. It is legacy API and deprecated since Node. js v9.
Although assert is already included in nodejs installation. You still need to require it.
var assert = require('assert')
And then use as follows:
assert.equal(1,1);
This module is used for writing unit tests for your applications, you can access it with require('assert').
var assert = require('assert');
assert.throws(
function() {
throw new Error("Wrong value");
},
function(err) {
if ( (err instanceof Error) && /value/.test(err) ) {
return true;
}
},
"unexpected error"
);
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