Node.js assert tracker.report() Function

The tracker.report() method is used to get information about the expected and actual number of calls of the functions that have not been called the expected number of times.

This function returns a JavaScript object containing complete details of the expected and actual number of calls with a stack trace.

Syntax:  

tracker.report()

Parameters: This function takes no parameters

Return Value: It returns an object containing complete details of expected and actual number of calls with a stack trace.

Example 1:

Javascript

const assert = require('assert');

// Creates call tracker.
const tracker = new assert.CallTracker();

function func() {}

// Returns a function that wraps func() that must be called exact times
// before tracker.verify().
const callsfunc = tracker.calls(func, 2);

console.log(tracker.report());

Output:

Example 2:

Javascript

const assert = require('assert');

// Creates call tracker.
const tracker = new assert.CallTracker();

function func() {}

// Returns a function that wraps func() that must be called exact times
// before tracker.verify().
const callsfunc = tracker.calls(func, 2);

// called func through callsfunc
callsfunc();

console.log(tracker.report());

Output:

Reference:https://nodejs.org/api/assert.html#assert_tracker_report