feat(odb): add more bindings and api methods

test/odb_test.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 
+import 'package:libgit2dart/src/git_types.dart';
 import 'package:test/test.dart';
 import 'package:libgit2dart/libgit2dart.dart';
 import 'helpers/util.dart';
@@ -7,7 +8,9 @@ import 'helpers/util.dart';
 void main() {
   late Repository repo;
   late Directory tmpDir;
-  const lastCommit = '78b8bf123e3952c970ae5c1ce0a3ea1d1336f6e8';
+  const commitSha = '78b8bf123e3952c970ae5c1ce0a3ea1d1336f6e8';
+  const blobSha = '9c78c21d6680a7ffebc76f7ac68cacc11d8f48bc';
+  const blobContent = 'Feature edit\n';
 
   setUp(() async {
     tmpDir = await setupRepo(Directory('test/assets/testrepo/'));
@@ -26,12 +29,74 @@ void main() {
       odb.free();
     });
 
+    test('successfully creates new odb with no backends', () {
+      final odb = Odb.create();
+      expect(odb, isA<Odb>());
+      odb.free();
+    });
+
+    test('successfully adds disk alternate', () {
+      final oid = Oid.fromSHA(repo: repo, sha: blobSha);
+      final odb = Odb.create();
+      odb.addDiskAlternate('${repo.workdir}.git/objects/');
+
+      expect(odb.contains(oid), true);
+
+      odb.free();
+    });
+
+    test('successfully reads object', () {
+      final oid = Oid.fromSHA(repo: repo, sha: blobSha);
+      final odb = repo.odb;
+      final object = odb.read(oid);
+
+      expect(object.id, oid);
+      expect(object.type, GitObject.blob);
+      expect(object.data, blobContent);
+      expect(object.size, 13);
+
+      object.free();
+      odb.free();
+    });
+
+    test('returns list of all objects oid\'s in database', () {
+      final oid = Oid.fromSHA(repo: repo, sha: commitSha);
+      final odb = repo.odb;
+
+      expect(odb.objects, isNot(isEmpty));
+      expect(odb.objects.contains(oid), true);
+
+      odb.free();
+    });
+
     test('finds object by short oid', () {
       final oid = Oid.fromSHA(
         repo: repo,
-        sha: lastCommit.substring(0, 5),
+        sha: commitSha.substring(0, 5),
       );
-      expect(oid.sha, lastCommit);
+      expect(oid.sha, commitSha);
+    });
+
+    test('successfully writes data', () {
+      final odb = repo.odb;
+      final oid = odb.write(type: GitObject.blob, data: 'testing');
+      final object = odb.read(oid);
+
+      expect(odb.contains(oid), true);
+      expect(object.data, 'testing');
+
+      object.free();
+      odb.free();
+    });
+
+    test('throws when trying to write with invalid object type', () {
+      final odb = repo.odb;
+      expect(
+        () => odb.write(type: GitObject.any, data: 'testing'),
+        throwsA(isA<ArgumentError>()),
+      );
+
+      odb.free();
     });
   });
 }