mockkStatic(UtilJava::class) mockkStatic(UtilKotlin::class) every { UtilJava.ok() } returns "Joe" every { UtilKotlin.ok() } returns "Tsai" // When util.ok() // Then verify { UtilJava.ok() } verify { UtilKotlin.ok() } assertEquals("Joe", UtilJava.ok()) assertEquals("Tsai", UtilKotlin.ok()) } MockkStatic