@Mock
    private Category category;
    //...testTarget and other mocks
    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
        //get connection, doReturn, etc.
    }

    @Test
    public void save() throws Exception {
        testTarget.save(category);

        assertThat(category.getId()).isNotEqualTo(0);
    }

<hibernate-mapping default-lazy="true">
    <class name="com.domain.models.Category" table="Category">
        <id name="id" type="long" access="property">
            <column name="categoryId" length="20"/>
            <generator class="identity"/>
        </id>
        <property name="name" column="categoryName" type="string"/>
        <property name="image" column="categoryImage" type="string"/>
        <property name="parentId" column="categoryParentId" type="long"/>
    </class>
</hibernate-mapping>