The tns test <platform> command allows you to install and/or start the testing framework. We will cover testing in more depth in later chapters, however, for the sake of completeness, we will cover the command in this section. tns test init will initialize the testing system; you will do this once per application. It will ask you to select a testing framework and then install your chosen testing framework. tns test <platform> will start the testing on that specific platform.