feat(worktree): add ability to pass options to prune(...) API method (#71)

test/git_types_test.dart

@@ -562,4 +562,14 @@ void main() {
     final actual = {for (final e in GitIndexAddOption.values) e: e.value};
     expect(actual, expected);
   });
+
+  test('GitWorktree returns correct values', () {
+    const expected = {
+      GitWorktree.pruneValid: 1,
+      GitWorktree.pruneLocked: 2,
+      GitWorktree.pruneWorkingTree: 4,
+    };
+    final actual = {for (final e in GitWorktree.values) e: e.value};
+    expect(actual, expected);
+  });
 }

test/worktree_test.dart

@@ -151,6 +151,22 @@ void main() {
       expect(repo.worktrees, <String>[]);
     });
 
+    test('prunes worktree with provided flags', () {
+      expect(repo.worktrees, <String>[]);
+
+      final worktree = Worktree.create(
+        repo: repo,
+        name: worktreeName,
+        path: worktreeDir.path,
+      );
+      expect(repo.worktrees, [worktreeName]);
+      expect(worktree.isPrunable, false);
+      expect(worktree.isValid, true);
+
+      worktree.prune({GitWorktree.pruneValid});
+      expect(repo.worktrees, <String>[]);
+    });
+
     test('throws when trying get list of worktrees and error occurs', () {
       expect(
         () => Worktree.list(Repository(nullptr)),