feat(worktree): add base bindings and api

test/worktree_test.dart

@@ -0,0 +1,73 @@
+import 'dart:io';
+import 'package:test/test.dart';
+import 'package:libgit2dart/libgit2dart.dart';
+import 'helpers/util.dart';
+
+void main() {
+  late Repository repo;
+  final tmpDir = '${Directory.systemTemp.path}/worktree_testrepo/';
+  final worktreeDir = '${Directory.systemTemp.path}/worktree';
+
+  setUp(() async {
+    if (await Directory(tmpDir).exists()) {
+      await Directory(tmpDir).delete(recursive: true);
+    }
+
+    if (await Directory(worktreeDir).exists()) {
+      await Directory(worktreeDir).delete(recursive: true);
+    }
+
+    await copyRepo(
+      from: Directory('test/assets/testrepo/'),
+      to: await Directory(tmpDir).create(),
+    );
+    repo = Repository.open(tmpDir);
+  });
+
+  tearDown(() async {
+    repo.free();
+    await Directory(tmpDir).delete(recursive: true);
+    if (await Directory(worktreeDir).exists()) {
+      await Directory(worktreeDir).delete(recursive: true);
+    }
+  });
+
+  group('Worktree', () {
+    test('successfully creates worktree at provided path', () {
+      const worktreeName = 'worktree';
+      expect(Worktree.list(repo), []);
+
+      final worktree = Worktree.create(
+        repo: repo,
+        name: worktreeName,
+        path: worktreeDir,
+      );
+
+      expect(Worktree.list(repo), [worktreeName]);
+      expect(repo.branches.list(), contains(worktreeName));
+      expect(worktree.name, worktreeName);
+      expect(worktree.path, worktreeDir);
+      expect(File('$worktreeDir/.git').existsSync(), true);
+
+      worktree.free();
+    });
+
+    test('successfully prunes worktree', () {
+      const worktreeName = 'worktree';
+      expect(Worktree.list(repo), []);
+
+      final worktree = Worktree.create(
+        repo: repo,
+        name: worktreeName,
+        path: worktreeDir,
+      );
+      expect(Worktree.list(repo), [worktreeName]);
+
+      Directory(worktreeDir).deleteSync(recursive: true);
+      worktree.prune();
+      expect(Worktree.list(repo), []);
+
+      worktree.free();
+    });
+  });
+}