fake static method
Swap the vault service with a FakeVaultService for testing.
Returns the fake so tests can inspect recorded operations and run assertions.
final fake = Vault.fake({'token': 'seed_value'});
await Vault.put('key', 'value');
fake.assertWritten('key');
Implementation
static FakeVaultService fake([Map<String, String> initialValues = const {}]) {
final driver = FakeVaultService(initialValues);
Magic.app.setInstance('vault', driver);
return driver;
}