Add pytest unit testing framework

tests/utils/fixtures.py

@@ -0,0 +1,30 @@
+"""This module provides utility fixtures for testing."""
+from typing import Tuple
+
+from _pytest.fixtures import FixtureRequest
+import pytest
+
+
+@pytest.fixture(params=[True, False])
+def boolean(request: FixtureRequest) -> bool:
+    return request.param
+
+
+@pytest.fixture
+def boolean1(boolean: bool) -> Tuple[bool]:
+    return (boolean,)
+
+
+@pytest.fixture(params=[True, False])
+def boolean2(request: FixtureRequest, boolean: bool) -> Tuple[bool, bool]:
+    return (boolean, request.param)
+
+
+@pytest.fixture(params=[True, False])
+def boolean3(
+    request: FixtureRequest, boolean2: Tuple[bool, bool]
+) -> Tuple[bool, bool, bool]:
+    return (boolean2[0], boolean2[1], request.param)
+
+
+# …

tests/utils/helpers.py

@@ -0,0 +1,24 @@
+"""This module provides utility functions for testing."""
+from typing import Generator, Tuple
+from unittest.mock import Mock
+
+
+def AsyncMock(*args, **kwargs):
+    """Mocks a asyncronous coroutine which can be called with 'await'."""
+    m = Mock(*args, **kwargs)
+
+    async def mock_coro(*args, **kwargs):
+        return m(*args, **kwargs)
+
+    mock_coro.mock = m
+    return mock_coro
+
+
+def list_true_once_each(length: int) -> Generator[Tuple[bool, ...], None, None]:
+    """Yields tuples of bools with exactly one entry being True, starting left.
+
+    Args:
+        length: Length of the resulting tuples
+    """
+    for i in range(length):
+        yield tuple(i == j for j in range(length))