What is Test Coverage

Idea of test coverage is to give you confidence while quickly verifying whether the change will break things

Different Types of Tests

Source

Unit test

Tests a single unit in isolation

• For me, that's a class
• A unit test will create an object, invoke a method, and check a result
• It answers the question "does my code do what I intended it to do?"

Integration test

Tests the combination of two components in the system

• It is focused on the relationship between the components, not the components themselves
• It answers the question "do these components work together as intended"

System test

Tests the whole software system

• It answers the question "does this software work as intended?"

Acceptance test

Automated way for the customer answer the question "is this software what I think I want?"

• It is a kind of a system test

All automated tests are limited by axiom "End-to-end is further than you think" - meaning, eventually a human has to sit down in front of a computer and look at user interface to make sure something is working as expected