Add test for VQA generation

tests/e2e_tests/test_generate_vqa.py

@@ -0,0 +1,50 @@
+import json
+import os
+import subprocess
+from pathlib import Path
+
+
+def test_generate_vqa(tmp_path: Path):
+    repo_root = Path(__file__).resolve().parents[2]
+    os.chdir(repo_root)
+
+    config_path = repo_root / "graphgen" / "configs" / "vqa_config.yaml"
+    output_dir = tmp_path / "output"
+    output_dir.mkdir(parents=True, exist_ok=True)
+
+    result = subprocess.run(
+        [
+            "python",
+            "-m",
+            "graphgen.generate",
+            "--config_file",
+            str(config_path),
+            "--output_dir",
+            str(output_dir),
+        ],
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    assert result.returncode == 0, f"Script failed with error: {result.stderr}"
+
+    data_root = output_dir / "data" / "graphgen"
+    assert data_root.exists(), f"{data_root} does not exist"
+    run_folders = sorted(data_root.iterdir(), key=lambda p: p.name, reverse=True)
+    assert run_folders, f"No run folders found in {data_root}"
+    run_folder = run_folders[0]
+
+    config_saved = run_folder / "config.yaml"
+    assert config_saved.exists(), f"{config_saved} not found"
+
+    json_files = list(run_folder.glob("*.json"))
+    assert json_files, f"No JSON output found in {run_folder}"
+
+    log_files = list(run_folder.glob("*.log"))
+    assert log_files, "No log file generated"
+
+    with open(json_files[0], "r", encoding="utf-8") as f:
+        data = json.load(f)
+    assert (
+        isinstance(data, list) and len(data) > 0
+    ), "JSON output is empty or not a list"