feat(commit): add base bindings and api

test/signature_test.dart

@@ -0,0 +1,63 @@
+import 'package:test/test.dart';
+import 'package:libgit2dart/libgit2dart.dart';
+
+void main() {
+  late Signature signature;
+  group('Signature', () {
+    const name = 'Some Name';
+    const email = 'some@email.com';
+    const time = 1234567890;
+    const offset = 0;
+
+    setUp(() {
+      signature = Signature.create(
+        name: name,
+        email: email,
+        time: time,
+        offset: offset,
+      );
+    });
+
+    tearDown(() {
+      signature.free();
+    });
+
+    test('successfully creates with provided time and offset', () {
+      expect(signature, isA<Signature>());
+    });
+
+    test('successfully creates without provided time and offset', () {
+      final defaultSignature =
+          Signature.create(name: 'Name', email: 'email@example.com');
+      expect(defaultSignature, isA<Signature>());
+      expect(defaultSignature.name, 'Name');
+      expect(defaultSignature.email, 'email@example.com');
+      expect(
+        defaultSignature.time -
+            (DateTime.now().millisecondsSinceEpoch / 1000).truncate(),
+        lessThan(5),
+      );
+      expect(defaultSignature.offset, 180);
+      defaultSignature.free();
+    });
+
+    test('returns correct values', () {
+      expect(signature.name, name);
+      expect(signature.email, email);
+      expect(signature.time, time);
+      expect(signature.offset, offset);
+    });
+
+    test('compares two objects', () {
+      final otherSignature = Signature.create(
+        name: name,
+        email: email,
+        time: time,
+        offset: offset,
+      );
+      expect(signature == otherSignature, true);
+
+      otherSignature.free();
+    });
+  });
+}