test: Improve test cases in sentinel-apache-dubbo-adapter module

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-adapter/sentinel-apache-dubbo-adapter/src/test/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboConsumerFilterTest.java

@@ -19,6 +19,7 @@ import com.alibaba.csp.sentinel.BaseTest;
 import com.alibaba.csp.sentinel.Entry;
 import com.alibaba.csp.sentinel.EntryType;
 import com.alibaba.csp.sentinel.adapter.dubbo.config.DubboConfig;
+import com.alibaba.csp.sentinel.adapter.dubbo.fallback.DefaultDubboFallback;
 import com.alibaba.csp.sentinel.adapter.dubbo.fallback.DubboFallback;
 import com.alibaba.csp.sentinel.adapter.dubbo.fallback.DubboFallbackRegistry;
 import com.alibaba.csp.sentinel.adapter.dubbo.provider.DemoService;
@@ -82,6 +83,7 @@ public class SentinelDubboConsumerFilterTest extends BaseTest {
     @After
     public void cleanUp() {
         cleanUpAll();
+        DubboFallbackRegistry.setConsumerFallback(new DefaultDubboFallback());
     }
 
     public void initFlowRule(String resource) {

sentinel-adapter/sentinel-apache-dubbo-adapter/src/test/java/com/alibaba/csp/sentinel/adapter/dubbo/fallback/DubboFallbackRegistryTest.java

@@ -20,7 +20,9 @@ import com.alibaba.csp.sentinel.slots.block.SentinelRpcException;
 import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
 import org.apache.dubbo.rpc.AsyncRpcResult;
 import org.apache.dubbo.rpc.Result;
+import org.junit.After;
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 /**
@@ -28,6 +30,16 @@ import org.junit.Test;
  */
 public class DubboFallbackRegistryTest {
 
+    @Before
+    public void setUp() {
+        DubboFallbackRegistry.setConsumerFallback(new DefaultDubboFallback());
+    }
+
+    @After
+    public void tearDown() {
+        DubboFallbackRegistry.setConsumerFallback(new DefaultDubboFallback());
+    }
+
     @Test(expected = SentinelRpcException.class)
     public void testDefaultFallback() {
         // Test for default.