Jasmine.js comparing arrays
JavascriptJasmineJavascript Problem Overview
Is there a way in jasmine.js to check if two arrays are equal, for example:
arr = [1, 2, 3]
expect(arr).toBe([1, 2, 3])
expect(arr).toEqual([1, 2, 3])
Neither seems to work.
Javascript Solutions
Solution 1 - Javascript
Just did the test and it works with toEqual
please find my test:
describe('toEqual', function() {
it('passes if arrays are equal', function() {
var arr = [1, 2, 3];
expect(arr).toEqual([1, 2, 3]);
});
});
Just for information: > toBe() versus toEqual(): toEqual() checks equivalence. toBe(), on the > other hand, makes sure that they're the exact same object.
Solution 2 - Javascript
You can compare an array like the below mentioned if the array has some values
it('should check if the array are equal', function() {
var mockArr = [1, 2, 3];
expect(mockArr ).toEqual([1, 2, 3]);
});
But if the array that is returned from some function has more than 1 elements and all are zero then verify by using
expect(mockArray[0]).toBe(0);
Solution 3 - Javascript
just for the record you can always compare using JSON.stringify
const arr = [1,2,3];
expect(JSON.stringify(arr)).toBe(JSON.stringify([1,2,3]));
expect(JSON.stringify(arr)).toEqual(JSON.stringify([1,2,3]));
It's all meter of taste, this will also work for complex literal objects
Solution 4 - Javascript
I had a similar issue where one of the arrays was modified. I was using it for $httpBackend
, and the returned object from that was actually a $promise
object containing the array (not an Array
object).
You can create a jasmine matcher to match the array by creating a toBeArray
function:
beforeEach(function() {
'use strict';
this.addMatchers({
toBeArray: function(array) {
this.message = function() {
return "Expected " + angular.mock.dump(this.actual) + " to be array " + angular.mock.dump(array) + ".";
};
var arraysAreSame = function(x, y) {
var arraysAreSame = true;
for(var i; i < x.length; i++)
if(x[i] !== y[i])
arraysAreSame = false;
return arraysAreSame;
};
return arraysAreSame(this.actual, array);
}
});
});
And then just use it in your tests like the other jasmine matchers:
it('should compare arrays properly', function() {
var array1, array2;
/* . . . */
expect(array1[0]).toBe(array2[0]);
expect(array1).toBeArray(array2);
});