Add test for FolderPropertyLoader class

src/test/java/jenkins/advancedqueue/jobinclusion/strategy/FolderPropertyLoaderTest.java

@@ -0,0 +1,69 @@
+package jenkins.advancedqueue.jobinclusion.strategy;
+
+import static org.junit.Assert.*;
+
+import com.cloudbees.hudson.plugins.folder.Folder;
+import hudson.model.FreeStyleProject;
+import jenkins.advancedqueue.DecisionLogger;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.JenkinsRule;
+
+public class FolderPropertyLoaderTest {
+
+    @Rule
+    public JenkinsRule jenkinsRule = new JenkinsRule();
+
+    private Folder folder;
+    private FreeStyleProject project;
+    private DecisionLogger decisionLogger;
+
+    @Before
+    public void setUp() throws Exception {
+        folder = jenkinsRule.createProject(com.cloudbees.hudson.plugins.folder.Folder.class, "testFolder");
+        project = folder.createProject(FreeStyleProject.class, "testProject");
+        decisionLogger = new DecisionLogger() {
+            @Override
+            public DecisionLogger addDecisionLog(int indent, String log) {
+                return null;
+            }
+        };
+    }
+
+    @Test
+    public void getJobGroupName_returnsGroupName_whenJobGroupIsEnabled() throws Exception {
+        JobInclusionFolderProperty property = new JobInclusionFolderProperty(true, "TestGroup");
+        folder.getProperties().add(property);
+
+        String result = FolderPropertyLoader.getJobGroupName(decisionLogger, project);
+
+        assertEquals("TestGroup", result);
+    }
+
+    @Test
+    public void getJobGroupName_returnsNull_whenNoJobGroupProperty() throws Exception {
+        String result = FolderPropertyLoader.getJobGroupName(decisionLogger, project);
+
+        assertNull(result);
+    }
+
+    @Test
+    public void getJobGroupName_returnsNull_whenJobGroupIsDisabled() throws Exception {
+        JobInclusionFolderProperty property = new JobInclusionFolderProperty(false, "TestGroup");
+        folder.getProperties().add(property);
+
+        String result = FolderPropertyLoader.getJobGroupName(decisionLogger, project);
+
+        assertNull(result);
+    }
+
+    @Test
+    public void getJobGroupName_returnsNull_whenParentIsNotFolder() throws Exception {
+        FreeStyleProject standaloneProject = jenkinsRule.createFreeStyleProject("standaloneProject");
+
+        String result = FolderPropertyLoader.getJobGroupName(decisionLogger, standaloneProject);
+
+        assertNull(result);
+    }
+}