Add ticket branch discovery by ticket key

tests/Feature/Git/GiteaProviderTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Feature\Git;
 
 use App\Actions\Git\Data\GitAuthenticatedUser;
+use App\Actions\Git\Data\GitBranch;
 use App\Actions\Git\Data\GitRepository;
 use App\Actions\Git\Gitea\GiteaProviderClient;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -80,4 +81,40 @@ class GiteaProviderTest extends TestCase
                 && $request->hasHeader('Authorization', 'token repo-token');
         });
     }
+
+    /**
+     * Ensure the provider lists branches for a specific repository.
+     */
+    public function test_provider_can_list_repository_branches(): void
+    {
+        Http::preventStrayRequests();
+        Http::fake([
+            'https://git.example.test/api/v1/repos/core-team/kanbangit/branches*' => Http::response([
+                [
+                    'name' => 'CORE-1-login-form',
+                ],
+                [
+                    'name' => 'main',
+                ],
+            ]),
+        ]);
+
+        $branches = app(GiteaProviderClient::class)->listBranches(
+            'https://git.example.test',
+            'branch-token',
+            'core-team',
+            'kanbangit',
+        );
+
+        $this->assertCount(2, $branches);
+        $this->assertContainsOnlyInstancesOf(GitBranch::class, $branches);
+        $this->assertSame('CORE-1-login-form', $branches[0]->name);
+
+        Http::assertSent(function ($request): bool {
+            return str_starts_with(
+                $request->url(),
+                'https://git.example.test/api/v1/repos/core-team/kanbangit/branches',
+            ) && $request->hasHeader('Authorization', 'token branch-token');
+        });
+    }
 }