EnumTests.java

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

import org.junit.jupiter.api.Test;

class EnumTests {

    enum YourFriendlyEnumMostPeopleUse {
        THING1, THING2
    }

    enum YesEnumsCanBeMuchMore {
        THING1, THING2 {
            @Override
            public void something() {
            }
        };

        void something() {}
    }

    @Test
    void mindBlown() {
        assertThat(YourFriendlyEnumMostPeopleUse.THING1.getClass().isEnum()).isTrue();
        assertThat(YesEnumsCanBeMuchMore.THING1.getClass().isEnum()).isTrue();
        assertThat(YesEnumsCanBeMuchMore.THING2.getClass().isEnum()).isFalse();
    }
}