refactored

@@ -33,7 +33,6 @@ import org.junit.rules.TestRule;
 import org.junit.rules.TestWatcher;
 import org.junit.runner.Description;
 import org.junit.runner.RunWith;
-import org.mockito.Mockito;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootContextLoader;
 import org.springframework.boot.test.context.SpringBootTest;
@@ -49,7 +48,6 @@ import org.springframework.mock.http.MockHttpOutputMessage;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.ContextConfiguration;
-import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.test.web.servlet.MockMvc;
@@ -75,7 +73,6 @@ import org.thingsboard.server.service.security.auth.jwt.RefreshTokenRequest;
 import org.thingsboard.server.service.security.auth.rest.LoginRequest;
 
 import java.io.IOException;
-import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;