Karma is not a testing framework, it just launches a HTTP server, and generates the test runner HTML file. It uses Nodejs and SocketIO to allow running your code and tests in multiple browsers.
At first you need to install NodeJS on your machine. Once you have NodeJS installed, you can install Karma by running the following command.
npm install -g karma
Now you need to generate the config file. The configuration file can be generated using the following command
It will generate a dummy config file (karma.config.js).
You can start Karma by running the following command
karma start // it will look for karma.config.js in your current directory
This will start the Karma server on port 9876. You can view the results printed in thr console bu running the karma run command.
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