[type:test][ISSUE apache#5278] add unit test for shenyu-discovery-api. (

apache#5285)

* [type:test][ISSUE apache#5278] add test cas for shenyu-discovery-api.

* [type:test][ISSUE apache#5278] add test cas for shenyu-discovery-api.

shenyu-discovery/shenyu-discovery-api/src/test/java/org/apache/shenyu/discovery/api/config/DiscoveryConfigTest.java

@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shenyu.discovery.api.config;
+
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Properties;
+import java.util.function.BiConsumer;
+import java.util.function.Function;
+
+/**
+ * The Test Case For {@link DiscoveryConfig}.
+ */
+@ExtendWith(MockitoExtension.class)
+public class DiscoveryConfigTest {
+
+    private final DiscoveryConfig discoveryConfig = new DiscoveryConfig();
+
+    @Test
+    public void testDiscoveryConfigProperties() {
+        // the discovery name
+        String name = "divide_default_discovery";
+        // zookeeper nacos etcd consul
+        String type = "local";
+        // the discovery pops (json)
+        String serverList = "{\"host\": \"localhost\"}";  
+
+        testGetSet(DiscoveryConfig::getName, DiscoveryConfig::setName, name);
+        testGetSet(DiscoveryConfig::getType, DiscoveryConfig::setType, type);
+        testGetSet(DiscoveryConfig::getServerList, DiscoveryConfig::setServerList, serverList);
+
+        Properties properties = Mockito.mock(Properties.class);
+        Assertions.assertNotNull(discoveryConfig.getProps());
+        discoveryConfig.setProps(properties);
+        Assertions.assertEquals(properties, discoveryConfig.getProps());
+    }
+
+    /**
+     * abstract function to test properties get and set.
+     *
+     * @param getter Object Get Function
+     * @param setter Object Set Function
+     * @param value  Object Function Value
+     * @param <T>    T
+     */
+    private <T> void testGetSet(final Function<DiscoveryConfig, T> getter,
+                                final BiConsumer<DiscoveryConfig, T> setter,
+                                final T value) {
+        Assertions.assertNull(getter.apply(discoveryConfig));
+        setter.accept(discoveryConfig, value);
+        Assertions.assertEquals(getter.apply(discoveryConfig), value);
+    }
+}

shenyu-discovery/shenyu-discovery-api/src/test/java/org/apache/shenyu/discovery/api/listener/DataChangedEventListenerTest.java

@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shenyu.discovery.api.listener;
+
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.apache.shenyu.discovery.api.listener.DiscoveryDataChangedEvent.Event.ADDED;
+import static org.apache.shenyu.discovery.api.listener.DiscoveryDataChangedEvent.Event.DELETED;
+import static org.apache.shenyu.discovery.api.listener.DiscoveryDataChangedEvent.Event.IGNORED;
+import static org.apache.shenyu.discovery.api.listener.DiscoveryDataChangedEvent.Event.UPDATED;
+
+/**
+ * The Test Case For {@link DataChangedEventListener}.
+ */
+public class DataChangedEventListenerTest {
+
+    @Test
+    public void testOnChange() {
+        AtomicReference<String> eventResult = new AtomicReference<>("");
+
+        DataChangedEventListener dataChangedEventListener = event -> {
+            DiscoveryDataChangedEvent.Event currentEvent = event.getEvent();
+            switch (currentEvent) {
+                case ADDED:
+                    // added logic...
+                    eventResult.set(ADDED.name());
+                    break;
+                case UPDATED:
+                    // updated logic...
+                    eventResult.set(UPDATED.name());
+                    break;
+                case DELETED:
+                    // deleted logic...
+                    eventResult.set(DELETED.name());
+                    break;
+                case IGNORED:
+                    // ignored logic...
+                    eventResult.set(IGNORED.name());
+                    break;
+                default:
+                    break;
+            }
+        };
+        DiscoveryDataChangedEvent dataChangedEvent = new DiscoveryDataChangedEvent("key", "value", IGNORED);
+        dataChangedEventListener.onChange(dataChangedEvent);
+
+        Assertions.assertEquals(eventResult.get(), IGNORED.name());
+    }
+}

shenyu-discovery/shenyu-discovery-api/src/test/java/org/apache/shenyu/discovery/api/listener/DiscoveryDataChangedEventTest.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shenyu.discovery.api.listener;
+
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+
+/**
+ * The Test Case For {@link DiscoveryDataChangedEvent}.
+ */
+public class DiscoveryDataChangedEventTest {
+
+    private final DiscoveryDataChangedEvent.Event event = DiscoveryDataChangedEvent.Event.IGNORED;
+
+    @Test
+    public void testDiscoveryDataChangedEvent() {
+        String key = "key";
+        String value = "value";
+        DiscoveryDataChangedEvent discoveryDataChangedEvent = new DiscoveryDataChangedEvent(key, value, event);
+        Assertions.assertEquals(key, discoveryDataChangedEvent.getKey());
+        Assertions.assertEquals(value, discoveryDataChangedEvent.getValue());
+        Assertions.assertEquals(event, discoveryDataChangedEvent.getEvent());
+    }
+
+}