src/test/PhoneBookTest.java


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import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class PhoneBookTest {
    @Test
    void test() {
        PhoneBook.add(911, "police");
        PhoneBook.add(76213, "Mom");
        PhoneBook.add(17239, "Bob");

        assertEquals("Mom", PhoneBook.find(76213));
        assertEquals("not found", PhoneBook.find(910));
        assertEquals("police", PhoneBook.find(911));

        PhoneBook.del(910);
        PhoneBook.del(911);

        assertEquals("not found", PhoneBook.find(911));
        assertEquals("Mom", PhoneBook.find(76213));

        PhoneBook.add(76213, "daddy");
        assertEquals("daddy", PhoneBook.find(76213));
    }

}