Test a JavaScript function within an Angular service using the Jasmine framework

I need to write a unit test for a JavaScript function within an Angular service using Jasmine.

Here is the Angular service:

angular.module("app.services").service("validationService", ["$q", function ($q) {

        this.validate = function (filter): ng.IPromise<any> {
            let defer = $q.defer();

            defer.resolve(validateOrder(filter.valA, filter.valB);

            return defer.promise;
        };

        function validateOrder = (valueA, valueB) {
            return valueA > valueB;
        };
    }]);

This is my current unit test:

"use strict";

describe("Service: validationService -> ", function () {
    // load the service"s module
    beforeEach(module("app.services"));

    var validationService;

    beforeEach(inject(function ($injector) {
        validationService = $injector.get("validationService");
    }));

    it("should call validateOrder and return false", function() {
        // Arrange
        var filter = {"valA": 10, "valB": 100};

        // Act and Assert
        expect(validationService.validateOrder(filter.valA, filter.valB)).toEqual(false);
    });

});

I am looking to test the function named "validateOrder" while converting it into a this.validateOrder function. How can I achieve this while keeping it as a standalone function?

Answer №1

It is challenging to test private functions without exposing them. Testing public functions (functions within scope) allows for indirect testing of private functions.

Exploring methods to test 'private' functions in an Angular service using Karma and Jasmine

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