diff --git a/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ExecuteEventListenerTest.java b/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ExecuteEventListenerTest.java
index 8a565d8bd8a58..7f3677e38eb19 100644
--- a/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ExecuteEventListenerTest.java
+++ b/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ExecuteEventListenerTest.java
@@ -50,80 +50,80 @@
 import static org.mockito.Mockito.when;
 
 public final class ExecuteEventListenerTest {
-
-	private static final MockTracer TRACER = new MockTracer(new ThreadLocalActiveSpanSource(),
-			MockTracer.Propagator.TEXT_MAP);
-
-	private final ExecutorEngine executorEngine = new ExecutorEngine(5);
-
-	@BeforeClass
-	public static void init() {
-		ShardingJDBCTracer.init(TRACER);
-	}
-
-	@AfterClass
-	public static void tearDown() throws Exception {
-		releaseTracer();
-	}
-
-	@Before
-	public void before() {
-		TRACER.reset();
-	}
-
-	@Test
-	public void assertSingleStatement() throws Exception {
-		Statement statement = mock(Statement.class);
-		when(statement.getConnection()).thenReturn(mock(Connection.class));
-		executorEngine.execute(SQLType.DML, Collections.singleton(new StatementUnit(new SQLExecutionUnit("ds_0",
-				new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), statement)), new ExecuteCallback<Integer>() {
-
-			@Override
-			public Integer execute(final BaseStatementUnit baseStatementUnit) {
-				return 0;
-			}
-		});
-		assertThat(TRACER.finishedSpans().size(), is(2));
-	}
-
-	@Test
-	public void assertMultiStatement() throws Exception {
-		List<StatementUnit> statementUnitList = new ArrayList<>(2);
-		Statement stm1 = mock(Statement.class);
-		when(stm1.getConnection()).thenReturn(mock(Connection.class));
-		statementUnitList.add(new StatementUnit(new SQLExecutionUnit("ds_0", new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), stm1));
-		Statement stm2 = mock(Statement.class);
-		when(stm2.getConnection()).thenReturn(mock(Connection.class));
-		statementUnitList.add(new StatementUnit(new SQLExecutionUnit("ds_0", new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), stm2));
-		executorEngine.execute(SQLType.DML, statementUnitList, new ExecuteCallback<Integer>() {
-			@Override
-			public Integer execute(final BaseStatementUnit baseStatementUnit) throws Exception {
-				return 0;
-			}
-		});
-		assertThat(TRACER.finishedSpans().size(), is(3));
-	}
-
-	@Test(expected = SQLException.class)
-	public void assertSQLException() throws Exception {
-		Statement statement = mock(Statement.class);
-		when(statement.getConnection()).thenReturn(mock(Connection.class));
-		executorEngine.execute(SQLType.DQL, Collections.singleton(new StatementUnit(new SQLExecutionUnit("ds_0",
-				new SQLUnit("select ...", Collections.singletonList(Collections.<Object>singletonList(1)))), statement)), new ExecuteCallback<Integer>() {
-
-			@Override
-			public Integer execute(final BaseStatementUnit baseStatementUnit) throws Exception {
-				throw new SQLException();
-			}
-		});
-	}
-
-	private static void releaseTracer() throws NoSuchFieldException, IllegalAccessException {
-		Field tracerField = GlobalTracer.class.getDeclaredField("tracer");
-		tracerField.setAccessible(true);
-		tracerField.set(GlobalTracer.class, NoopTracerFactory.create());
-		Field subscribersByTypeField = EventBus.class.getDeclaredField("subscribersByType");
-		subscribersByTypeField.setAccessible(true);
-		subscribersByTypeField.set(EventBusInstance.getInstance(), HashMultimap.create());
-	}
+    
+    private static final MockTracer TRACER = new MockTracer(new ThreadLocalActiveSpanSource(), MockTracer.Propagator.TEXT_MAP);
+    
+    private final ExecutorEngine executorEngine = new ExecutorEngine(5);
+    
+    @BeforeClass
+    public static void init() {
+        ShardingJDBCTracer.init(TRACER);
+    }
+    
+    @AfterClass
+    public static void tearDown() throws Exception {
+        releaseTracer();
+    }
+    
+    @Before
+    public void before() {
+        TRACER.reset();
+    }
+    
+    @Test
+    public void assertSingleStatement() throws Exception {
+        Statement statement = mock(Statement.class);
+        when(statement.getConnection()).thenReturn(mock(Connection.class));
+        executorEngine.execute(SQLType.DML, Collections.singleton(new StatementUnit(new SQLExecutionUnit("ds_0",
+                new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), statement)), new ExecuteCallback<Integer>() {
+            
+            @Override
+            public Integer execute(final BaseStatementUnit baseStatementUnit) {
+                return 0;
+            }
+        });
+        assertThat(TRACER.finishedSpans().size(), is(2));
+    }
+    
+    @Test
+    public void assertMultiStatement() throws Exception {
+        List<StatementUnit> statementUnitList = new ArrayList<>(2);
+        Statement stm1 = mock(Statement.class);
+        when(stm1.getConnection()).thenReturn(mock(Connection.class));
+        statementUnitList.add(new StatementUnit(new SQLExecutionUnit("ds_0", new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), stm1));
+        Statement stm2 = mock(Statement.class);
+        when(stm2.getConnection()).thenReturn(mock(Connection.class));
+        statementUnitList.add(new StatementUnit(new SQLExecutionUnit("ds_0", new SQLUnit("insert into ...", Collections.singletonList(Collections.<Object>singletonList(1)))), stm2));
+        executorEngine.execute(SQLType.DML, statementUnitList, new ExecuteCallback<Integer>() {
+            
+            @Override
+            public Integer execute(final BaseStatementUnit baseStatementUnit) {
+                return 0;
+            }
+        });
+        assertThat(TRACER.finishedSpans().size(), is(3));
+    }
+    
+    @Test(expected = SQLException.class)
+    public void assertSQLException() throws Exception {
+        Statement statement = mock(Statement.class);
+        when(statement.getConnection()).thenReturn(mock(Connection.class));
+        executorEngine.execute(SQLType.DQL, Collections.singleton(new StatementUnit(new SQLExecutionUnit("ds_0",
+                new SQLUnit("select ...", Collections.singletonList(Collections.<Object>singletonList(1)))), statement)), new ExecuteCallback<Integer>() {
+            
+            @Override
+            public Integer execute(final BaseStatementUnit baseStatementUnit) throws Exception {
+                throw new SQLException();
+            }
+        });
+    }
+    
+    private static void releaseTracer() throws NoSuchFieldException, IllegalAccessException {
+        Field tracerField = GlobalTracer.class.getDeclaredField("tracer");
+        tracerField.setAccessible(true);
+        tracerField.set(GlobalTracer.class, NoopTracerFactory.create());
+        Field subscribersByTypeField = EventBus.class.getDeclaredField("subscribersByType");
+        subscribersByTypeField.setAccessible(true);
+        subscribersByTypeField.set(EventBusInstance.getInstance(), HashMultimap.create());
+    }
 }
diff --git a/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ShardingJDBCTracerTest.java b/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ShardingJDBCTracerTest.java
index bf488b564e293..ce78f44444fe6 100644
--- a/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ShardingJDBCTracerTest.java
+++ b/sharding-opentracing/src/test/java/io/shardingsphere/opentracing/ShardingJDBCTracerTest.java
@@ -25,68 +25,65 @@
 import io.shardingsphere.core.exception.ShardingException;
 import io.shardingsphere.core.util.EventBusInstance;
 import io.shardingsphere.opentracing.fixture.FooTracer;
-
-import static org.hamcrest.CoreMatchers.is;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
 import java.lang.reflect.Field;
 
+import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.core.Is.isA;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.mock;
 
 public final class ShardingJDBCTracerTest {
-
-	@Before
-	public void setUp() throws Exception {
-		System.setProperty("shardingjdbc.opentracing.tracer.class", FooTracer.class.getName());
-		clearGlobalTracer();
-		unregisterEventBus();
-	}
-
-	@After
-	public void tearDown() {
-		System.getProperties().remove("shardingjdbc.opentracing.tracer.class");
-	}
-
-	@Test
-	public void assertDuplicatedLoading() {
-		ShardingJDBCTracer.init(mock(Tracer.class));
-		Tracer t1 = ShardingJDBCTracer.get();
-		ShardingJDBCTracer.init();
-		assertEquals(t1, ShardingJDBCTracer.get());
-		ShardingJDBCTracer.init(mock(Tracer.class));
-		assertEquals(t1, ShardingJDBCTracer.get());
-	}
-
-	@Test
-	public void assertTracer() {
-		assertThat((GlobalTracer) ShardingJDBCTracer.get(), isA(GlobalTracer.class));
-		assertTrue(GlobalTracer.isRegistered());
-		assertThat(ShardingJDBCTracer.get(), is(ShardingJDBCTracer.get()));
-	}
-
-	@Test(expected = ShardingException.class)
-	public void assertTracerClassError() {
-		System.setProperty("shardingjdbc.opentracing.tracer.class", "com.foo.FooTracer");
-		ShardingJDBCTracer.get();
-
-	}
-
-	private static void clearGlobalTracer() throws NoSuchFieldException, IllegalAccessException {
-		Field tracerField = GlobalTracer.class.getDeclaredField("tracer");
-		tracerField.setAccessible(true);
-		tracerField.set(GlobalTracer.class, NoopTracerFactory.create());
-
-	}
-
-	private static void unregisterEventBus() throws NoSuchFieldException, IllegalAccessException {
-		Field subscribersByTypeField = EventBus.class.getDeclaredField("subscribersByType");
-		subscribersByTypeField.setAccessible(true);
-		subscribersByTypeField.set(EventBusInstance.getInstance(), HashMultimap.create());
-	}
-
+    
+    @Before
+    public void setUp() throws Exception {
+        System.setProperty("shardingjdbc.opentracing.tracer.class", FooTracer.class.getName());
+        clearGlobalTracer();
+        unregisterEventBus();
+    }
+    
+    @After
+    public void tearDown() {
+        System.getProperties().remove("shardingjdbc.opentracing.tracer.class");
+    }
+    
+    @Test
+    public void assertDuplicatedLoading() {
+        ShardingJDBCTracer.init(mock(Tracer.class));
+        Tracer t1 = ShardingJDBCTracer.get();
+        ShardingJDBCTracer.init();
+        assertEquals(t1, ShardingJDBCTracer.get());
+        ShardingJDBCTracer.init(mock(Tracer.class));
+        assertEquals(t1, ShardingJDBCTracer.get());
+    }
+    
+    @Test
+    public void assertTracer() {
+        assertThat((GlobalTracer) ShardingJDBCTracer.get(), isA(GlobalTracer.class));
+        assertTrue(GlobalTracer.isRegistered());
+        assertThat(ShardingJDBCTracer.get(), is(ShardingJDBCTracer.get()));
+    }
+    
+    @Test(expected = ShardingException.class)
+    public void assertTracerClassError() {
+        System.setProperty("shardingjdbc.opentracing.tracer.class", "com.foo.FooTracer");
+        ShardingJDBCTracer.get();
+    }
+    
+    private static void clearGlobalTracer() throws NoSuchFieldException, IllegalAccessException {
+        Field tracerField = GlobalTracer.class.getDeclaredField("tracer");
+        tracerField.setAccessible(true);
+        tracerField.set(GlobalTracer.class, NoopTracerFactory.create());
+    }
+    
+    private static void unregisterEventBus() throws NoSuchFieldException, IllegalAccessException {
+        Field subscribersByTypeField = EventBus.class.getDeclaredField("subscribersByType");
+        subscribersByTypeField.setAccessible(true);
+        subscribersByTypeField.set(EventBusInstance.getInstance(), HashMultimap.create());
+    }
 }