Create many mocks quickly with annotations #
Sometimes you will need to create many mocks in your test class. As each mock needs to be declared as a property in the test class, then initialized in the test setup function, the amount of code needed to build all your mocks can grow very quickly. MockK provides a shorthand using annotations to make this simpler.
class RepositoryTest {
@MockK private lateinit var foodDatabase: FoodDatabase
@MockK private lateinit var recipeDatabase: RecipeDatabase
@MockK private lateinit var networkClient: NetworkClient
@SpyK private var logger = Logger()
@Before
fun setup() {
MockKAnnotations.init(this)
}
@Test
fun testDatabaseAndNetwork() {
// ... use foodDatabase, recipeDatabase, networkClient and debugger
}
}
Each property with the @MockK
annotation is automatically mocked and ready to use in tests. This reduces repetition and makes your tests more readable. The above class is equivalent to:
class RepositoryTest {
private lateinit var foodDatabase: FoodDatabase
private lateinit var recipeDatabase: RecipeDatabase
private lateinit var networkClient: NetworkClient
private lateinit var logger: Logger
@Before
fun setup() {
foodDatabase = mockk()
recipeDatabase = mockk()
networkClient = mockk()
logger = spyk(Logger())
}
@Test
fun testDatabaseAndNetwork() {
// ... use foodDatabase, recipeDatabase, networkClient and debugger
}
}
Options #
@MockK
annotations take the same options as the mockk
function. If you wish to use a relaxed mock, the annotation looks similar to the equivalent mockk
call:
// Annotations
class RepositoryTest {
@MockK(relaxed = true) private lateinit var foodDatabase: FoodDatabase
@MockK(relaxUnitFun = true) private lateinit var recipeDatabase: RecipeDatabase
@Before
fun setup() {
MockKAnnotations.init(this)
}
}
// Long form
class RepositoryTest {
private lateinit var foodDatabase: FoodDatabase
private lateinit var recipeDatabase: RecipeDatabase
@Before
fun setup() {
foodDatabase = mockk(relaxed = true)
recipeDatabase = mockk(relaxUnitFun = true)
}
}
In addition to @MockK(relaxed = true)
, there is an equivalent @RelaxedMockK
annotation.
If options are shared across every annotated mock, they can be passed to the init
call instead.
class RepositoryTest {
@MockK private lateinit var foodDatabase: FoodDatabase
@MockK private lateinit var recipeDatabase: RecipeDatabase
@Before
fun setup() {
MockKAnnotations.init(this, relaxed = true)
}
}
Spies #
TODO