This chapter covers recipes related to testing and debugging Flutter apps.
14.1 Writing Unit Tests
Problem
You want to write unit tests.
Solution
Use API in test package.
Discussion
Unit tests are very important in app development. To write tests in Flutter apps, you need to add test: ^1.5.3 to the dev_dependencies section of pubspec.yaml file. Test files are usually put in the test directory. The MovingBox class in Listing 14-1 is the class to test. The move() method
updates the internal _offset variable.
class MovingBox {
MovingBox({Offset initPos = Offset.zero}) : _offset = initPos;
Offset _offset; ...
