feat: Add unit tests for CustomServiceTagResolver

streampipes-service-extensions/pom.xml

@@ -57,6 +57,18 @@
                 </exclusion>
             </exclusions>
         </dependency>
+
+        <!-- Test dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

streampipes-service-extensions/src/test/java/org/apache/streampipes/service/extensions/CustomServiceTagResolverTest.java

@@ -0,0 +1,68 @@
+/*
+ * 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.streampipes.service.extensions;
+
+
+import org.apache.streampipes.commons.environment.Environment;
+import org.apache.streampipes.commons.environment.variable.StringEnvironmentVariable;
+import org.apache.streampipes.model.extensions.svcdiscovery.SpServiceTag;
+import org.apache.streampipes.model.extensions.svcdiscovery.SpServiceTagPrefix;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class CustomServiceTagResolverTest {
+
+  private StringEnvironmentVariable customServiceTags;
+  private CustomServiceTagResolver resolver;
+
+  @BeforeEach
+  void setUp() {
+    var env = mock(Environment.class);
+    customServiceTags = mock(StringEnvironmentVariable.class);
+    when(env.getCustomServiceTags()).thenReturn(customServiceTags);
+    resolver = new CustomServiceTagResolver(env);
+  }
+
+  @Test
+  void returnsCustomServiceTagsWhenTheyExist() {
+    when(customServiceTags.exists()).thenReturn(true);
+    when(customServiceTags.getValue()).thenReturn("tag1,tag2");
+
+    var result = resolver.getCustomServiceTags();
+
+    assertEquals(2, result.size());
+    assertTrue(result.contains(SpServiceTag.create(SpServiceTagPrefix.CUSTOM, "tag1")));
+    assertTrue(result.contains(SpServiceTag.create(SpServiceTagPrefix.CUSTOM, "tag2")));
+  }
+
+  @Test
+  void returnsEmptySetWhenNoCustomServiceTagsExist() {
+    when(customServiceTags.exists()).thenReturn(false);
+
+    var result = resolver.getCustomServiceTags();
+
+    assertTrue(result.isEmpty());
+  }
+}