import org.junit.Test;

import static org.fest.assertions.api.Assertions.assertThat;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.when;

public class HelloWorldTest {

@Test

public void hello_world_test() {

//given

Dependency dependency = new Dependency();

HelloWorld helloWorld = new HelloWorld(dependency);

//when

String actual = helloWorld.beenCalled();

//then

assertThat(actual).isEqualTo("Leave me alone.");

}

@Test

public void should_be_mocked() {

//given

Dependency dependency = mock(Dependency.class);

when(dependency.say()).thenReturn("Hello World");

HelloWorld helloWorld = new HelloWorld(dependency);

//when

String actual = helloWorld.beenCalled();

//then

assertThat(actual).isEqualTo("Hello World");

}

}