changing test cases from junit to mockito in android app

Question

i am trying to test out an email field in login screen. i want to change the following code using mockito. can it be done. pls help??

class EmailValidatorTest {

    @Test
    fun emailValidator_CorrectEmailSimple_ReturnsGood() {
        val email = "[email protected]"
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.GOOD)
    }

    @Test
    fun emailValidator_CorrectEmailSubDomain_ReturnsGood() {
        val email = "[email protected]"
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.GOOD)
    }

    @Test
    fun emailValidator_InvalidEmailNoTld_ReturnsIncorrect() {
        val email = "name@email"
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.INCORRECT)
    }

    @Test
    fun emailValidator_InvalidEmailDoubleDot_ReturnsIncorrect() {
        val email = "[email protected]"
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.INCORRECT)
    }

    @Test
    fun emailValidator_InvalidEmailNoUsername_ReturnsIncorrect() {
        val email = "@email.com"
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.INCORRECT)
    }

    @Test
    fun emailValidator_EmptyString_ReturnsEmpty() {
        val email = ""
        assertThat(EmailPasswordChecker.getEmailState(email)).isEqualTo(EmailState.EMPTY)
}

here is some more helper code->

object EmailPasswordChecker{
//some code that i cant share

        }

enum class EmailState {
    GOOD,
    INCORRECT,
    EMPTY
}

these are simple tests that i wrote using JUnit. but now i need to change them using mockito. can someone help me with the code? i am fairly new to testing so i am not exactly able to figure out how this framework is working.