diff --git a/sharding-proxy/src/test/java/io/shardingsphere/shardingproxy/backend/jdbc/connection/BackendConnectionTest.java b/sharding-proxy/src/test/java/io/shardingsphere/shardingproxy/backend/jdbc/connection/BackendConnectionTest.java
index 6683e04bb8719c..ad23e21d2af5cb 100644
--- a/sharding-proxy/src/test/java/io/shardingsphere/shardingproxy/backend/jdbc/connection/BackendConnectionTest.java
+++ b/sharding-proxy/src/test/java/io/shardingsphere/shardingproxy/backend/jdbc/connection/BackendConnectionTest.java
@@ -28,11 +28,14 @@
 import org.mockito.junit.MockitoJUnitRunner;
 
 import java.sql.Connection;
+import java.util.ArrayList;
 import java.util.List;
 
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -42,21 +45,26 @@ public class BackendConnectionTest {
     @Mock
     private LogicSchema logicSchema;
     
+    @Mock
+    private JDBCBackendDataSource backendDataSource;
+    
     private BackendConnection backendConnection = new BackendConnection();
     
     @Before
     @SuppressWarnings("unchecked")
     @SneakyThrows
     public void setup() {
-        List<Connection> newConnection = mock(List.class);
-        JDBCBackendDataSource backendDataSource = mock(JDBCBackendDataSource.class);
-        when(backendDataSource.getConnections((ConnectionMode) any(), anyString(), anyInt())).thenReturn(newConnection);
         when(logicSchema.getBackendDataSource()).thenReturn(backendDataSource);
+        backendConnection.setLogicSchema(logicSchema);
     }
     
     @Test
+    @SneakyThrows
     public void assertGetConnectionCacheIsEmpty() {
-    
+        when(backendDataSource.getConnections((ConnectionMode) any(), anyString(), eq(2))).thenReturn(mockNewConnections(2));
+        List<Connection> actualConnections = backendConnection.getConnections(ConnectionMode.MEMORY_STRICTLY, "ds1", 2);
+        assertThat(actualConnections.size(), is(2));
+        assertThat(backendConnection.getConnectionSize(), is(2));
     }
     
     @Test
@@ -78,4 +86,13 @@ public void assertGetConnectionSizeIsOne() {
     public void assertMultiThreadGetConnection() {
     
     }
+    
+    private List<Connection> mockNewConnections(final int connectionSize) {
+        List<Connection> result = new ArrayList<>();
+        for (int i = 0; i < connectionSize; i++) {
+            Connection connection = mock(Connection.class);
+            result.add(connection);
+        }
+        return result;
+    }
 }