package example.delivery;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.*;
class GreetingUnitTests {
    @Test void unitNeedsNoContext() {
        var service=new GreetingService();
        assertThat(service.greet("reader")).isEqualTo("hello reader");
        assertThatThrownBy(()->service.greet(" ")).isInstanceOf(IllegalArgumentException.class);
    }
}