Software⏱️ 3 min read📅 2026-06-04

How to Fix: "Error: No provider for router" while writing Karma-Jasmine unit test cases

Learn how to fix: "Error: No provider for router" while writing Karma-Jasmine unit test cases.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

Error: No provider for router while writing Karma-Jasmine unit test cases affects developers who are trying to write unit tests for Angular applications.

This error is frustrating because it prevents developers from testing their application's functionality, leading to a delay in the development process. To resolve this issue, we will provide a step-by-step guide on how to fix it.

💡 Why You Are Getting This Error

  • The primary reason for this error is that Karma-Jasmine does not automatically configure the router provider by default.
  • An alternative cause could be that the router module is not properly imported in the test file.

🔧 Proven Troubleshooting Steps

Configuring the Router Provider in Karma

  1. Step 1: Open the karma.conf.js file and add the following lines to configure the router provider:
  2. Step 2: module.exports = function(config) { config.set({ ... }); config.set('webpack', { module: 'karma-webpack' }); });
  3. Step 3: Add the necessary import statements for the router module in your test file.
  4. Step 4: Use the @angular/core/testing module and import the RouterTestingModule to configure the router provider.

Importing the Router Module Directly

  1. Step 1: Open the my-new-component.component.ts file and add the following lines to import the router module directly:
  2. Step 2: @NgModule({ imports: [BrowserModule, RouterTestingModule] })
  3. Step 3: class MyNewComponent { constructor(private router: Router) { } }
  4. Step 4: Note that this method may not be recommended as it can lead to namespace pollution.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'No provider for router' error and write successful Karma-Jasmine unit test cases for your Angular application.

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