test(config): add test__as_bool

tests/test_config.py

@@ -0,0 +1,31 @@
+"""Tests for the module ``src/poetry_plugin_dotenv/config.py``."""
+
+from __future__ import annotations
+
+import pytest
+
+from poetry_plugin_dotenv.config import _as_bool
+
+
+@pytest.mark.parametrize(
+    argnames=("value", "expected_bool"),
+    argvalues=[
+        ("y", True),
+        ("yes", True),
+        ("t", True),
+        ("on", True),
+        ("1", True),
+        ("true", True),
+        ("n", False),
+        ("no", False),
+        ("f", False),
+        ("off", False),
+        ("0", False),
+        ("false", False),
+        pytest.param("nope", None, marks=pytest.mark.xfail(raises=ValueError)),
+    ],
+)
+def test__as_bool(value: str, expected_bool: bool) -> None:  # noqa: FBT001
+    """Test for the ``_as_bool`` function."""
+
+    assert expected_bool == _as_bool(value)