Test Inspiration

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This class from Spring Academy course Lab: Returning a list with GET contains librairies that may be interesting to refactor tests

package example.cashcard;

import org.assertj.core.util.Arrays;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.json.JsonTest;
import org.springframework.boot.test.json.JacksonTester;

import java.io.IOException;

import static org.assertj.core.api.Assertions.assertThat;

@JsonTest
class CashCardJsonTest {

    @Autowired
    private JacksonTester<CashCard> json;

    @Autowired
    private JacksonTester<CashCard[]> jsonList;

    private CashCard[] cashCards;

    @BeforeEach
    void setUp() {
        cashCards = Arrays.array(
                new CashCard(99L, 123.45),
                new CashCard(100L, 100.00),
                new CashCard(101L, 150.00));
    }

    @Test
    void cashCardSerializationTest() throws IOException {
        CashCard cashCard = cashCards[0];
        assertThat(json.write(cashCard)).isStrictlyEqualToJson("single.json");
        assertThat(json.write(cashCard)).hasJsonPathNumberValue("@.id");
        assertThat(json.write(cashCard)).extractingJsonPathNumberValue("@.id")
                .isEqualTo(99);
        assertThat(json.write(cashCard)).hasJsonPathNumberValue("@.amount");
        assertThat(json.write(cashCard)).extractingJsonPathNumberValue("@.amount")
                .isEqualTo(123.45);
    }

    @Test
    void cashCardDeserializationTest() throws IOException {
        String expected = """
                {
                    "id": 99,
                    "amount": 123.45
                }
                """;
        assertThat(json.parse(expected))
                .isEqualTo(new CashCard(99L, 123.45));
        assertThat(json.parseObject(expected).id()).isEqualTo(99);
        assertThat(json.parseObject(expected).amount()).isEqualTo(123.45);
    }
}