static mocking

StaticTests.kt

private object Buddy {

    @JvmStatic
    fun name(): String = "John"

    @JvmStatic
    fun hello(name: String) = name
}

class StaticTests {

    @Test
    fun lookMomICanMockStaticMethods() {
        assertThat(Buddy.name()).isEqualTo("John")

        mockStatic(Buddy::class.java).use {
            it.`when`<Any>(Buddy::name).thenReturn("Rafael")
            assertThat(Buddy.name()).isEqualTo("Rafael")
        }

        assertThat(Buddy.name()).isEqualTo("John")
    }

    @Test
    fun returnUtilTest() {
        assertEquals("foo", Buddy.hello("foo"))
        mockStatic(Buddy::class.java).use {
            it.`when`<Any> { Buddy.hello("foo") }.thenReturn("bar")
            assertEquals("bar", Buddy.hello("foo"))
        }
        assertEquals("foo", Buddy.hello("foo"))
    }
}