Trouble with launching Jasmine tests within define block in compiled Typescript

Currently, I am immersed in a testing project that involves setting up a pure Javascript Jasmine Karma environment to test a pre-compiled Typescript setup. Despite my efforts, I am facing an issue where the test cases refuse to start running.

While the console logs the messages from the compiled typescript without any problem, the actual test scripts fail to initiate.

It is important to note that this segment originated from an AngularApp but was created and compiled independently from Angular2.

Upon checking, there are no error messages displayed except for the notification that 0 out of 0 tests were executed, along with a missing timestamp for "component/to/test".

Within the test.spec.js file, the structure follows:

define("testName", ["component/to/test"], function(component){
    describe("testing module", function(){
         it("should work", function(){expect(true).toEqual(true)});
    })
}

As for the compiled typescript file, myTs.js, it looks like this:

var requirejs, require, define;
(function (global) {

    define("component/to/test" ["depend", "ences"]), function(depend,ences)
    { more code here }) 

     some compiled typescript here
});
require.config({
     path: {path to javascript libs},
     shim: { ... }
})

Moving on to the karma file configuration:

basePath: '',
frameworks: ['jasmine', 'requirejs'],
files: [
     'lib1',
     'lib2',
     'spec/test-main.js',
     {pattern: 'js/*.js', included: true, served: true},
     {pattern: 'spec/*.spec.js', included: false, served: true}
],
exclude: [],
reporters: ['progress'],
autoWatch: true,
browsers: ['Chrome']

Furthermore, in the test-main.js file, obtained after running karma init and opting to use requirejs:

var allTestFiles = []
var TEST_REGEXP = /(spec|test)\.js$/i

Object.keys(window.__karma__.files).forEach(function (file) {
if (TEST_REGEXP.test(file)) {

    var normalizedTestModule = file.replace(/^\/base\/|\.js$/g, '')
    allTestFiles.push(normalizedTestModule)
 }

})

require.config({
   baseUrl: 'base',
  deps: allTestFiles,
  callback: window.__karma__.start
})

For the sake of brevity, comments and unrelated code have been excluded to save space.

Answer №1

You have the potential to achieve what you're attempting. I have successfully accomplished it numerous times without encountering any issues.

It is crucial to always enable the enforceDefine option when running RequireJS:

require.config({
  enforceDefine: true,
  // Add any additional configurations here.
});

This setting helps in identifying any unnoticed problems. The only scenario where you should avoid turning on enforceDefine is if you have a valid reason specific to your case.

One significant issue in the provided code is the hardcoded module names in the define calls, such as define("testName", .... It is recommended to remove these hardcoded names. The optimizer will add module names when creating bundles. There are rare cases where hardcoded names are necessary, so unless you have a substantial reason for using them, it's best to avoid it.

In the context of your test file, the hardcoded name poses a challenge. For instance, test-main.js tries to load your test files but expects a module like spec/test.spec. However, the actual module defined is named testName, causing a silent failure when enforceDefine is not set.

While using the hardcoded name component/to/test in myTs.js may function correctly based on your configuration, it is still not recommended. You mentioned:

there was no timestamp for "component/to/test"

If you are referring to a Karma timestamp, it is not present because the file with that name does not exist.

Answer №2

Compiling spec files using tsc and then running karma over js files is not recommended.

Instead, it is advisable to set up karma with typescript loaders. You can try using the following package with a sample configuration:

https://www.npmjs.com/package/karma-typescript#configuration

If you are working on an Angular v2+ project, it is highly recommended to use @angular/cli.

https://github.com/angular/angular-cli

The @angular/cli is supported by the Angular team and offers many advantages, such as:

  • Production builds
  • Ahead-of-Time (AOT) compilation
  • Easy universal setup
  • Karma and Protractor configurations, and more

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