refactor(repository)!: move descendantOf() method into Commit

lib/src/bindings/graph.dart

@@ -2,15 +2,12 @@ import 'dart:ffi';
 
 import 'package:ffi/ffi.dart';
 import 'package:libgit2dart/src/bindings/libgit2_bindings.dart';
-import 'package:libgit2dart/src/error.dart';
 import 'package:libgit2dart/src/util.dart';
 
 /// Determine if a commit is the descendant of another commit.
 ///
 /// Note that a commit is not considered a descendant of itself, in contrast to
 /// `git merge-base --is-ancestor`.
-///
-/// Throws a [LibGit2Error] if error occured.
 bool descendantOf({
   required Pointer<git_repository> repoPointer,
   required Pointer<git_oid> commitPointer,
@@ -22,11 +19,7 @@ bool descendantOf({
     ancestorPointer,
   );
 
-  if (result < 0) {
-    throw LibGit2Error(libgit2.git_error_last());
-  } else {
   return result == 1 || false;
-  }
 }
 
 /// Count the number of unique commits between two commit objects.

lib/src/commit.dart

@@ -2,6 +2,7 @@ import 'dart:ffi';
 
 import 'package:libgit2dart/libgit2dart.dart';
 import 'package:libgit2dart/src/bindings/commit.dart' as bindings;
+import 'package:libgit2dart/src/bindings/graph.dart' as graph_bindings;
 import 'package:libgit2dart/src/bindings/libgit2_bindings.dart';
 
 class Commit {
@@ -309,6 +310,18 @@ class Commit {
     return Commit(bindings.nthGenAncestor(commitPointer: _commitPointer, n: n));
   }
 
+  /// Checks if commit is the descendant of another [ancestor] commit.
+  ///
+  /// Note that a commit is not considered a descendant of itself, in contrast
+  /// to `git merge-base --is-ancestor`.
+  bool descendantOf(Commit ancestor) {
+    return graph_bindings.descendantOf(
+      repoPointer: bindings.owner(_commitPointer),
+      commitPointer: bindings.id(_commitPointer),
+      ancestorPointer: bindings.id(ancestor.pointer),
+    );
+  }
+
   /// Creates an in-memory copy of a commit.
   ///
   /// **IMPORTANT**: Should be freed to release allocated memory.

lib/src/repository.dart

@@ -617,21 +617,6 @@ class Repository {
     );
   }
 
-  /// Checks if a provided [commit] is the descendant of another [ancestor]
-  /// commit.
-  ///
-  /// Note that a commit is not considered a descendant of itself, in contrast
-  /// to `git merge-base --is-ancestor`.
-  ///
-  /// Throws a [LibGit2Error] if error occured.
-  bool descendantOf({required Oid commit, required Oid ancestor}) {
-    return graph_bindings.descendantOf(
-      repoPointer: _repoPointer,
-      commitPointer: commit.pointer,
-      ancestorPointer: ancestor.pointer,
-    );
-  }
-
   /// Returns list with the `ahead` and `behind` number of unique commits
   /// respectively.
   ///

test/repository_test.dart

@@ -250,32 +250,15 @@ void main() {
     });
 
     test('checks if commit is a descendant of another commit', () {
-      final commit1 = repo['821ed6e8'];
-      final commit2 = repo['78b8bf12'];
+      final commit1 = Commit.lookup(repo: repo, oid: repo['821ed6e8']);
+      final commit2 = Commit.lookup(repo: repo, oid: repo['78b8bf12']);
 
-      expect(
-        repo.descendantOf(commit: commit1, ancestor: commit2),
-        true,
-      );
-      expect(
-        repo.descendantOf(commit: commit1, ancestor: commit1),
-        false,
-      );
-      expect(
-        repo.descendantOf(commit: commit2, ancestor: commit1),
-        false,
-      );
-    });
+      expect(commit1.descendantOf(commit2), true);
+      expect(commit1.descendantOf(commit1), false);
+      expect(commit2.descendantOf(commit1), false);
 
-    test('throws when trying to check if commit is descendant and error occurs',
-        () {
-      final commit1 = repo['821ed6e8'];
-      final commit2 = repo['78b8bf12'];
-      final nullRepo = Repository(nullptr);
-      expect(
-        () => nullRepo.descendantOf(commit: commit1, ancestor: commit2),
-        throwsA(isA<LibGit2Error>()),
-      );
+      commit1.free();
+      commit2.free();
     });
 
     test('returns number of ahead behind commits', () {