Add test_check_cla.py

check-cla/check_cla.py

@@ -9,12 +9,13 @@
 
 if TYPE_CHECKING:
     from argparse import Namespace
+    from collections.abc import Sequence
 
 
-def parse_args() -> Namespace:
+def parse_args(argv: Sequence[str] | None = None) -> Namespace:
     # parse CLI for inputs
     parser = ArgumentParser()
-    parser.add_argument("cla_path", type=Path, help="Local path to the CLA file.")
+    parser.add_argument("path", type=Path, help="Local path to the CLA file.")
     parser.add_argument(
         "--id",
         type=int,
@@ -27,21 +28,24 @@ def parse_args() -> Namespace:
         required=True,
         help="Contributor's GitHub login.",
     )
-    return parser.parse_args()
+    return parser.parse_args(argv)
 
 
-def main() -> None:
-    args = parse_args()
-
-    path = args.cla_path
+def read_cla(path: Path) -> dict[int, str]:
     try:
-        signees = json.loads(path.read_text())
+        return json.loads(path.read_text())
     except FileNotFoundError:
-        signees = {}
+        return {}
+
 
-    signees[args.id] = args.login
+def write_cla(path: Path, signees: dict[int, str]) -> None:
     path.write_text(json.dumps(signees, indent=2, sort_keys=True) + "\n")
 
 
+def main() -> None:
+    args = parse_args()
+    write_cla(args.path, {**read_cla(args.path), args.id: args.login})
+
+
 if __name__ == "__main__":
     main()

check-cla/data/empty.json

@@ -0,0 +1 @@
+{}

check-cla/data/multiple.json

@@ -0,0 +1,5 @@
+{
+  "111": "foo",
+  "123": "login",
+  "222": "bar"
+}

check-cla/data/single.json

@@ -0,0 +1,3 @@
+{
+  "123": "login"
+}

check-cla/test_check_cla.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import filecmp
+from argparse import Namespace
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+
+from check_cla import parse_args, read_cla, write_cla
+
+if TYPE_CHECKING:
+    from typing import Final
+
+DATA: Final = Path(__file__).parent / "data"
+
+EMPTY: Final[dict[int, str]] = {}
+SINGLE: Final = {"123": "login"}
+MULTIPLE: Final = {"111": "foo", "123": "login", "222": "bar"}
+
+
+def test_parse_args() -> None:
+    with pytest.raises(SystemExit):
+        parse_args([])
+    with pytest.raises(SystemExit):
+        parse_args(["file"])
+    with pytest.raises(SystemExit):
+        parse_args(["--id=123"])
+    with pytest.raises(SystemExit):
+        parse_args(["--login=login"])
+    with pytest.raises(SystemExit):
+        parse_args(["file", "--id=123"])
+    with pytest.raises(SystemExit):
+        parse_args(["file", "--login=login"])
+    with pytest.raises(SystemExit):
+        parse_args(["--id=123", "--login=login"])
+    assert parse_args(["file", "--id=123", "--login=login"]) == Namespace(
+        path=Path("file"),
+        id=123,
+        login="login",
+    )
+
+
+@pytest.mark.parametrize(
+    "path,signees",
+    [
+        ("missing", EMPTY),
+        ("empty.json", EMPTY),
+        ("single.json", SINGLE),
+        ("multiple.json", MULTIPLE),
+    ],
+)
+def test_read_cla(path: str, signees: dict[int, str]) -> None:
+    assert read_cla(DATA / path) == signees
+
+
+@pytest.mark.parametrize(
+    "path,signees",
+    [
+        ("empty.json", EMPTY),
+        ("single.json", SINGLE),
+        ("multiple.json", MULTIPLE),
+    ],
+)
+def test_write_cla(tmp_path: Path, path: str, signees: dict[int, str]) -> None:
+    write_cla(tmp := tmp_path / path, signees)
+    assert filecmp.cmp(tmp, DATA / path)