InterconvertStringAndIntegerTest.java

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class InterconvertStringAndIntegerTest {

    private Integer integer;
    private String string;

    @Test
    public void stringToInt1() {
        integer = 0;
        string = "0";

        testStringToInt(integer, string);
    }

    @Test
    public void stringToInt2() {
        integer = 1234;
        string = "1234";

        testStringToInt(integer, string);
    }

    @Test
    public void stringToInt3() {
        integer = -4321;
        string = "-4321";

        testStringToInt(integer, string);
    }

    private void testStringToInt(Integer integer, String string) {
        assertEquals(integer, InterconvertStringAndInteger.stringToInt(string));
    }

    @Test
    public void intToString1() {
        string = "0";
        integer = 0;

        testIntToString(string, integer);
    }

    @Test
    public void intToString2() {
        string = "1234";
        integer = 1234;

        testIntToString(string, integer);
    }

    @Test
    public void intToString3() {
        string = "-4321";
        integer = -4321;

        testIntToString(string, integer);
    }

    private void testIntToString(String string, int integer) {
        assertEquals(string, InterconvertStringAndInteger.intToString(integer));

    }
}