import json
from pathlib import Path

from gallery.examples import ALL_EXAMPLES

ROOT = Path(__file__).resolve().parents[1]


def test_example_ids_are_unique() -> None:
    ids = [example.id for example in ALL_EXAMPLES]
    assert len(ids) == len(set(ids))
    assert len(ids) >= 25


def test_every_example_builds_a_control() -> None:
    for example in ALL_EXAMPLES:
        assert example.builder() is not None, example.id


def test_source_manifest_is_complete_and_exact() -> None:
    manifest_path = ROOT / "src" / "gallery" / "source_manifest.json"
    manifest = json.loads(manifest_path.read_text(encoding="utf-8"))
    assert set(manifest) == {example.id for example in ALL_EXAMPLES}
    for anchor in manifest.values():
        source = (ROOT / anchor["path"]).read_text(encoding="utf-8").splitlines()
        assert source[anchor["line"] - 1].startswith(f"def {anchor['function']}(")