One of the common problems with technologies no matter what is the language used to build it, you will definitely break thing that previously worked when adding or releasing new features. This is where TDD (Test driven development) comes into play. TDD is one of the main parts of the agile development work culture. It increases the quality of the code, improves bug detection and faster development.
Karma is simply your testing server and a tool that allows you to execute JS code in multiple browsers. In its core its a Node server which watches the changes in your application file and re-runs your test cases to find any mistake. You can see the test case results on the command line
Assuming that you have already set up your angular application, now I am going to set up Karma so that I can run my test along with the development
Run the following command in your root directory of the APP
npm install karma karma-jasmine jasmine-core karma-chrome-launcher --save-dev
Also, install the Karma CLI as well
npm install -g karma-cli
Now we will install Angular, ui-router, and angular-mocks as dependencies to Karma.
npm install angular angular-ui-router angular-mocks --save-dev
If all goes well, verify the karma installation by the following command
After this, we need a karma configuration file for our test server.
You will be asked a few questions similar to the npm install and a new file karma.conf.js will be created in the root folder, to read more about its properties, see the config docs.