change browse api in order to build a tree base file structure

scm-core/src/test/java/sonia/scm/repository/FileObjectTest.java

@@ -0,0 +1,32 @@
+package sonia.scm.repository;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class FileObjectTest {
+
+  @Test
+  public void getParentPath() {
+    FileObject file = create("a/b/c");
+    assertEquals("a/b", file.getParentPath());
+  }
+
+  @Test
+  public void getParentPathWithoutParent() {
+    FileObject file = create("a");
+    assertEquals("", file.getParentPath());
+  }
+
+  @Test
+  public void getParentPathOfRoot() {
+    FileObject file = create("");
+    assertNull(file.getParentPath());
+  }
+
+  private FileObject create(String path) {
+    FileObject file = new FileObject();
+    file.setPath(path);
+    return file;
+  }
+}