IgniteTest.java

@RunWith(MockitoJUnitRunner.class)
public class IgniteAlertsSoreTest {
    @Mock
    private Ignite ignite;
    @Mock
    Cache<String, List<AlertEntry>>  cache;
    @Mock
    IgniteCache IgniteCache;
    @InjectMocks
    private IgniteAlertsStore igniteAlertsStore;
    //simulate the needed behaviour for the mocked ignite cache
    @Before
    public void setUp() throws Exception {
        when(ignite.getOrCreateCache(anyString())).thenReturn(IgniteCache);
        List<AlertEntry> entries=new ArrayList<>();
        entries.add(AlertEntry.builder().errorCode("errorCode").build());
        when(IgniteCache.get(anyString())).thenReturn(entries);
    }
    @Test
    public void getAllAlerts() throws Exception {
        assertEquals(igniteAlertsStore.getAlertForServiceId("serviceId").get(0).getErrorCode(),"errorCode");
    }


}