mockito, in koltin how to verify a static method - kotlin

Question

Having a kotlin singleton static method
internal object TestSingleton {
#JvmStatic
fun staticMethod1 (str: String) {
println("+++ === +++ TestSingleton.staticMethod(), $str")
staticMethod2 (str)
}
#JvmStatic
fun staticMethod2 (str: String) {
println("+++ === +++ TestSingleton.staticMethod2(), $str")
}
}
In java test code:
#Test
public void test_staticMethod() {
try (MockedStatic<TestSingleton> theMock = Mockito.mockStatic(TestSingleton.class, CALLS_REAL_METHODS)) {
TestSingleton.staticMethod1("test");
theMock.verify(() -> TestSingleton.staticMethod2(eq("test")), times(1));
}
}
it runs fine
but convert to kotlin it does not compile:
#Test
open fun test_staticMethod() {
Mockito.mockStatic(TestSingleton::class.java, Mockito.CALLS_REAL_METHODS).use { theMock ->
staticMethod1("test")
theMock.verify(() -> TestSingleton.staticMethod(any(Context.class), "test"), times(1))
// or
theMock.verify(times(1), () -> TestSingleton.staticMethod(any(Context.class)) )
}
}
having mockito version testImplementation "org.mockito:mockito-inline:3.12.4".
How to test static method using mockito in kotlin?
Not tried mockk yet since having a lot tests have been working with mockito. Not sure how simple with mockk in this case.

Answer 1

Here's how to do it in mockk (I highly recommend switching away from Mockito, mockk is just so much easier):
import TestSingleton.staticMethod1
import io.mockk.every
import io.mockk.just
import io.mockk.mockkStatic
import io.mockk.runs
import io.mockk.verify
import org.junit.jupiter.api.Test
internal object TestSingleton {
#JvmStatic
fun staticMethod1(str: String) {
println("+++ === +++ TestSingleton.staticMethod(), $str")
staticMethod2(str)
}
#JvmStatic
fun staticMethod2(str: String) {
println("+++ === +++ TestSingleton.staticMethod2(), $str")
}
}
class StackSign {
#Test
fun test_staticMethod() {
mockkStatic(TestSingleton::class)
every { TestSingleton.staticMethod2("test") } just runs
staticMethod1("test")
verify(exactly = 1) { TestSingleton.staticMethod2("test") }
}
}
BTW, add this to your build.gradle.kts
testImplementation("io.mockk:mockk:1.12.3")