Specification for unit test

test_spec.java

package com.flutterwave.raveandroid.validators;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.*;

@RunWith(JUnit4.class)
public class CvvValidatorTest {

    CvvValidator SUT; //system under test

    @Before
    public void setUp() throws Exception {
        SUT = new CvvValidator();
    }

    //correct cvv returns true
    //incorrect cvv returns false

    //UnitBeingTested_particularCase_ExpectedOutcome
    @Test
    public void isCvvValid_CorrectCvvPassed_returnsTrue() {
        //the three As of testing
        //Arrange
        //Act
        //Assert

        String cvv = "345";
        boolean isValid = SUT.isCvvValid(cvv);
        assertThat(true, is(isValid));
//        assertTrue(isValid);
    }

    @Test
    public void isCvvValid_4digitCvvPassed_returnsTrue() {
        //the three As of testing
        //Arrange
        //Act
        //Assert

        String cvv = "3345";
        boolean isValid = SUT.isCvvValid(cvv);
        assertThat(true, is(isValid));
//        assertTrue(isValid);
    }

    @Test
    public void isCvvValid_CvvPassedLongerThan4_returnsFalse() {
        //the three As of testing
        //Arrange
        //Act
        //Assert

        String cvv = "33457";
        boolean isValid = SUT.isCvvValid(cvv);
        assertThat(false, is(isValid));
//        assertTrue(isValid);
    }

    @Test
    public void isCvvValid_CvvPassedLessThan3_returnsFalse() {
        //the three As of testing
        //Arrange
        //Act
        //Assert

        String cvv = "33";
        boolean isValid = SUT.isCvvValid(cvv);
        assertThat(false, is(isValid));
//        assertTrue(isValid);
    }

    @Test
    public void isCvvValid_CvvPassedIsNotDigits_returnsFalse() {
        //the three As of testing
        //Arrange
        //Act
        //Assert

        String cvv = "3a3";
        boolean isValid = SUT.isCvvValid(cvv);
        assertThat(false, is(isValid));
//        assertTrue(isValid);
    }
}