给出一个Kotlin单例对象和调用它的方法的乐趣
object SomeObject {
fun someFun() {}
}
fun callerFun() {
SomeObject.someFun()
}
有没有办法模拟拨打SomeObject.someFun()的电话？
给出一个Kotlin单例对象和调用它的方法的乐趣
object SomeObject {
fun someFun() {}
}
fun callerFun() {
SomeObject.someFun()
}
有没有办法模拟拨打SomeObject.someFun()的电话？
Just make you object implement an interface, than you can mock you object with any mocking library. Here example of Junit + Mockito + Mockito-Kotlin:
import com.nhaarman.mockito_kotlin.mock
import com.nhaarman.mockito_kotlin.whenever
import org.junit.Assert.assertEquals
import org.junit.Test
object SomeObject : SomeInterface {
override fun someFun():String {
return ""
}
}
interface SomeInterface {
fun someFun():String
}
class SampleTest {
@Test
fun test_with_mock() {
val mock = mock<SomeInterface>()
whenever(mock.someFun()).thenReturn("42")
val answer = mock.someFun()
assertEquals("42", answer)
}
}
或者如果你想在callerFun中模拟SomeObject:
import com.nhaarman.mockito_kotlin.mock
import com.nhaarman.mockito_kotlin.whenever
import org.junit.Assert.assertEquals
import org.junit.Test
object SomeObject : SomeInterface {
override fun someFun():String {
return ""
}
}
class Caller(val someInterface: SomeInterface) {
fun callerFun():String {
return "Test ${someInterface.someFun()}"
}
}
// Example of use
val test = Caller(SomeObject).callerFun()
interface SomeInterface {
fun someFun():String
}
class SampleTest {
@Test
fun test_with_mock() {
val mock = mock<SomeInterface>()
val caller = Caller(mock)
whenever(mock.someFun()).thenReturn("42")
val answer = caller.callerFun()
assertEquals("Test 42", answer)
}
}