Unit Testing involves testing individual programs or modules for program execution. 2. It is performed by the testing team. It is performed by the development team. 3. Component testing is black box testing. Unit testing is white box testing. 4. The tester doesn’t know the internal architecture of the software. 12. Unit tests are tests that the tested code is inside of the actual class. Another dependencies of this class are mocked or ignored, because the focus is test the code inside the class. Integration tests are tests that involves disk access, application service and/or frameworks from the target application.
System testing, also referred to as system-level testing or system integration testing, is the process in which a quality assurance ( QA) team evaluates how the various components of an application interact together in the full, integrated system or application. System testing verifies that an application performs tasks as designed.
My approximately-true explanation. If a Rails application can be thought of a stack listed top-to-bottom as views-controllers-models, controller tests exercise controllers and everything “lower”. So controller tests test the “controllers-models” part of the “views-controllers-models” stack. Integration tests test the views and
Improve software quality: This testing helps improve your software’s overall quality. This leads to a higher quality product that meets the needs of your users. Reduce development time and cost: Integration tests can help to reduce development time and cost by catching issues early in the development process.

To follow this tutorial, you’ll need to have Ruby installed along with Rails. This tutorial was tested using Ruby version 2.3.3, Rails version 5.0.0.1, Minitest version 5.10.1, and Capybara version 2.11.1. Currently, there are no known issues with using earlier or later versions of any of those, however there will be some differences.

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feature test vs integration test