Add tests for generateTree

src/test/java/app/service/FileTreeOperationsTest.java

@@ -4,24 +4,64 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.fail;
 
+import java.io.File;
 import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.List;
 import java.util.Optional;
 
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
 import org.mockito.MockedStatic;
 import org.mockito.Mockito;
 
 import app.model.Model;
+import javafx.scene.control.CheckBoxTreeItem;
 import javafx.scene.control.TreeItem;
 
 public class FileTreeOperationsTest {
 
+  @TempDir
+  File tmp;
+
+  private void populateTmpDir() throws IOException {
+    List<String> files = List.of(
+      "test.java",
+      "test.md",
+      "test.txt",
+      "test.unknown"
+    );
+    for (String f : files) {
+      new File(tmp, f).createNewFile();
+    }
+  }
+
+  private void createRecursiveSymlink() throws IOException {
+    File folders = new File(tmp, "test/innerFolder/");
+    folders.mkdirs();
+
+    Path target = Paths.get(tmp.toPath().toString(), "test");
+    Path link = Paths.get(tmp.toPath().toString(), "test/innerFolder/test");
+
+    Files.createSymbolicLink(link, target);
+  }
+
   @Test
   @DisplayName("Test generateTree")
   public void testGenerateTree() {
+    try {
+      populateTmpDir();
+      createRecursiveSymlink();
+
+      CheckBoxTreeItem<String> parent = new CheckBoxTreeItem<>("Parent");
+      FiletreeOperations.generateTree(tmp, parent);
+    } catch (IOException e) {
+      fail(e);
+    }
 
   }
 
@@ -29,7 +69,6 @@ public class FileTreeOperationsTest {
     Path traversalPath = filePath;
     TreeItem<String> child = file;
       while (!traversalPath.equals(root)) {
-        System.out.println(traversalPath);
         traversalPath = traversalPath.getParent();
         TreeItem<String> parent = new TreeItem<>(traversalPath.getFileName().toString());
         parent.getChildren().add(child);