Tips for retrieving JSON files within karma tests

I am currently working on developing a test for my TypeScript class that involves retrieving data from a JSON file.

readData<T>(filePath: string): Promise<T> {
    return Qajax.getJSON(filePath);
}

For testing purposes, I am utilizing the Jasmine and Karma environment. However, I have encountered an issue where despite adding JSON files to Karma, they are not being loaded in the Chrome launcher.

    files: [
        'libs/angular/angular.js',
        'libs/angular/angular-route.js',
        'libs/angular/angular-mocks.js',            
        'libs/collections/collections.js',
        'tests/framework/common/app_config.json',
        'tests/package.json',

        { pattern: 'libs/qajax/qajax.js', included: false },
        { pattern: 'libs/q/q.js', included: false },

        { pattern: 'tests/framework/**/*.js', included: false },
        { pattern: 'tests/toolpattern/**/*.js', included: false },
        { pattern: 'tests/test-main.js', included: true },

    ]

In the above Karma configuration, you can see that I have included a file named app_config.json. Nevertheless, I am facing difficulties reading this file during testing...

it("test to read data.", function (done) {

    var promise = configurationAccessorImpl.readData("tests/framework/common/app_config.json");
    promise.then(result => {
        console.info("Get configuration test - Success.");
    }, error => {
        console.log(error);
    });

});

The test consistently fails due to the unavailability of the JSON file...

Answer №1

When utilizing the library jasmine-jquery, you have access to various extensions for the Jasmine JavaScript Testing Framework. One handy feature is the extension API, which allows you to handle HTML, CSS, and JSON fixtures in your test specifications.

To make use of these functionalities, follow these steps: - Include jasmine-jquery.js in your libs folder, and add jasmine-jquery.d.ts to /libs/typings. Ensure that you reference these files correctly in your karma.config file, and specify the location of your JSON fixtures for reading:

// list of files/patterns to load in the browser
files: [
…………………………..
'libs/jquery/jquery-1.9.1.js',
'libs/jasmine-jquery/jasmine-jquery.js',
………………….
// JSON fixture
{
pattern: 'configuration/*.json',
watched: true,
served: true,
included: false
}
],

- To read the file during a karma test, use the following code snippet:

/// <reference path="../../../libs/typings/jasmine-jquery/jasmine-jquery.d.ts" />
………………     
/**
* @description Unit test for - Retrieving the configuration file in karma.
*/
it("Configuration file accessor: Read configuration file test.", function (done) {

jasmine.getJSONFixtures().fixturesPath = 'base/configuration/';

var jsonData = getJSONFixture('app_config.json');
var appConfig = JSON.stringify(jsonData);

// Log the contents of the config file
console.info(appConfig);
expect(appConfig).toBeDefined();
});

Answer №2

The purpose of the function configurationAccessorImpl.readData is unclear. If you are attempting to retrieve JSON data through an HTTP request, there could be an issue due to karma serving test files from a /base relative path.

To address this, consider modifying your test code as follows:

var promise = configurationAccessorImpl.readData("/base/tests/framework/common/app_config.json");

This adjustment may help resolve the issue.

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