afterEach function
Registers a function to be run after tests.
This function will be called after each test is run.
If this is called within a describe/context, it applies only to tests in that
describe/context. The body
will be run before any tear-down callbacks in parent
describe/context or at the top level.
Each callback at the top level or in a given describe/context will be run in the reverse of the order they were declared.
Implementation
void afterEach(Future<void> Function(WidgetTester tester) body) {
_widgetDeclarer.tearDown(body);
}