fix ut unstable (#2192)

Author: jerrick-zhu

dubbo-config/dubbo-config-api/src/test/java/com/alibaba/dubbo/config/AbstractConfigTest.java

@@ -21,6 +21,7 @@
 import com.alibaba.dubbo.config.api.Greeting;
 import com.alibaba.dubbo.config.support.Parameter;
 import junit.framework.TestCase;
+import org.hamcrest.Matchers;
 import org.junit.Test;
 
 import java.lang.annotation.ElementType;
@@ -32,6 +33,8 @@
 import java.util.Map;
 import java.util.Properties;
 
+import static org.junit.Assert.assertThat;
+
 public class AbstractConfigTest {
 
     @Test
@@ -267,8 +270,8 @@ public void appendAnnotation() throws Exception {
         TestCase.assertEquals(2, annotationConfig.getParameters().size());
         TestCase.assertEquals("v1", annotationConfig.getParameters().get("k1"));
         TestCase.assertEquals("v2", annotationConfig.getParameters().get("k2"));
-        TestCase.assertEquals("<dubbo:annotation filter=\"f1, f2\" listener=\"l1, l2\" />",
-                annotationConfig.toString());
+        assertThat(annotationConfig.toString(), Matchers.containsString("filter=\"f1, f2\" "));
+        assertThat(annotationConfig.toString(), Matchers.containsString("listener=\"l1, l2\" "));
     }
 
     private static class PropertiesConfig extends AbstractConfig {