A testing library which makes it easy to test StateNotifier. Built to be used with the state_notifier, riverpod or flutter_riverpod packages
Package
Package is a port of felangel‘s bloc_test, modified to work with StateNotifier class
Installation
Add to dev dependencies inside pubspec_yaml:
dev_dependencies:
state_notifier_test: [version]
Usage
import 'package:state_notifier_test.dart';
stateNotifierTest(
'CounterNotifier emits [10] when seeded with 9',
build: () => CounterNotifier(),
seed: () => 9,
actions: (stateNotifier) => stateNotifier.increment(),
expect: () => [10],
);
class CounterStateNotifier extends StateNotifier<int> {
CounterStateNotifier() : super(0);
void increment() {
state = state + 1;
}
}
stateNotifierTest can also be used to skip any number of emitted states
before asserting against the expected states.
skip defaults to 0.
stateNotifierTest(
'CounterNotifier emits [2] when increment is called twice',
build: () => CounterNotifier(),
actions: (stateNotifier) {
stateNotifier
..increment()
..increment();
},
skip: 1,
expect: () => [2],
);
stateNotifierTest can also be used to verify internal stateNotifier functionality.
stateNotifierTest(
'CounterNotifier emits [1] when increment is called',
build: () => CounterNotifier(),
actions: (stateNotifier) => stateNotifier.increment(),
expect: () => [1],
verify: (_) {
verify(() => repository.someMethod(any())).called(1);
}
);
Testing Options
setUp is optional and should be used to set up
any dependencies prior to initializing the stateNotifier under test.
setUp should be used to set up state necessary for a particular test case.
For common set up code, prefer to use setUp from package:test/test.dart.
build should construct and return the stateNotifier under test.
seed is an optional Function that returns a state
which will be used to seed the stateNotifier before actions is called.
actions is an optional callback which will be invoked with the stateNotifier under
test and should be used to interactions with the stateNotifier.
skip is an optional int which can be used to skip any number of states.
skip defaults to 0.
expect is an optional Function that returns a Matcher which the stateNotifier
under test is expected to emit after actions is executed.
verify is an optional callback which is invoked after expect
and can be used for additional verification/assertions.
verify is called with the stateNotifier returned by build.
errors is an optional Function that returns a Matcher which the stateNotifier
under test is expected to throw after actions is executed.
tearDown is optional and can be used to
execute any code after the test has run.
tearDown should be used to clean up after a particular test case.
For common tear down code, prefer to use tearDown from package:test/test.dart.