RecipeServiceImplTest.java

package jian.he.recipe.services;

import jian.he.recipe.domain.Recipe;
import jian.he.recipe.repositroies.RecipeRepository;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import java.util.HashSet;

import java.util.Set;

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

class RecipeServiceImplTest {
    RecipeServiceImpl recipeService;

    @Mock
    RecipeRepository repository;

    @BeforeEach
    void setUp() {
        //set up an mock recipe repository.
        MockitoAnnotations.openMocks(this);

        recipeService = new RecipeServiceImpl(repository);
    }
    @Test
    void getRecipes() {
        Recipe recipe = new Recipe();
        HashSet receipeData = new HashSet();
        receipeData.add(recipe);
        when(repository.findAll()).thenReturn(receipeData);
        Set<Recipe> recipes =recipeService.getRecipes();
        assertEquals(recipes.size(),1);
        verify(repository, times(1)).findAll();
    }
}