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The command "ember test" is a command used in the Ember.js framework to run tests for the Ember application.

Ember.js is a JavaScript framework that allows you to build web applications. Testing is an essential part of software development, and Ember.js provides tools to help you write and run tests for your application.

When you run the "ember test" command, it will launch the test runner in your terminal or browser. The test runner is responsible for executing the tests that you have written for your Ember application.

The tests in Ember.js are written using a testing framework called QUnit. This framework provides a set of functions and assertions that allow you to define and verify the behavior of your application.

The "ember test" command will run all the tests that are defined in your Ember application and display the results in your console or browser. It will show you the passed and failed tests and any errors that occurred during the test run.

Running tests is important for ensuring the functionality and stability of your application. It helps catch bugs and issues early, allowing you to fix them before deploying your application to production.