Fix Git source sync failures

tests/test_git_sources.py

@@ -0,0 +1,66 @@
+import pytest
+
+from backend.app import git_source, main
+
+
+def test_clone_or_update_repo_clones_into_repo_path(monkeypatch, tmp_path):
+    commands = []
+
+    def fake_run(command, capture_output=True, text=True):
+        commands.append(command)
+
+        class Result:
+            returncode = 0
+            stdout = ""
+            stderr = ""
+
+        return Result()
+
+    monkeypatch.setattr(git_source, "run", fake_run)
+
+    result = git_source.clone_or_update_repo(
+        repo_id="neoforge-git",
+        repo_url="https://github.com/neoforged/Documentation.git",
+        branch="main",
+        repos_base=tmp_path,
+    )
+
+    assert result["success"] is True
+    assert commands == [
+        [
+            "git",
+            "clone",
+            "--branch",
+            "main",
+            "--single-branch",
+            "https://github.com/neoforged/Documentation.git",
+            str(tmp_path / "neoforge-git"),
+        ]
+    ]
+
+
+@pytest.mark.asyncio
+async def test_sync_sources_returns_failed_result_for_source_exception(monkeypatch):
+    async def fake_list_sources():
+        return {
+            "sources": [
+                {
+                    "library_id": "neoforge",
+                    "repo_url": "https://github.com/neoforged/Documentation.git",
+                    "branch": "main",
+                }
+            ]
+        }
+
+    async def fake_ingest_git_source(**kwargs):
+        raise RuntimeError("git is unavailable")
+
+    monkeypatch.setattr(main, "api_list_sources", fake_list_sources)
+    monkeypatch.setattr(main, "ingest_git_source", fake_ingest_git_source)
+
+    result = await main.sync_sources_api()
+
+    assert result["success"] is False
+    assert result["failed"] == 1
+    assert result["results"][0]["library_id"] == "neoforge"
+    assert result["results"][0]["error"] == "git is unavailable"