Prefer using tests from CPython

.github/workflows/python-tests.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
+        python -m pip install flake8
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Install self
       run: |
@@ -34,4 +34,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pytest
+        python -m pystd

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "ext/cpython"]
+	path = ext/cpython
+	url = https://github.com/python/cpython.git

pystd/__main__.py

@@ -0,0 +1,25 @@
+import sys
+import unittest
+import importlib.util
+from typing import List
+from unittest import TestSuite, TextTestRunner
+
+from . import random
+
+
+def load_cpython_tests() -> List[TestSuite]:
+    spec = importlib.util.spec_from_file_location(
+        "test_random", "ext/cpython/Lib/test/test_random.py"
+    )
+    test_random = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(test_random)
+    suite = unittest.defaultTestLoader.loadTestsFromModule(test_random)
+    return [suite]
+
+
+sys.modules["random"] = random
+
+if __name__ == "__main__":
+    suits = load_cpython_tests()
+    for suit in suits:
+        TextTestRunner(verbosity=2).run(suit)

pystd/random.py

@@ -1,5 +1,6 @@
 from typing import Sequence
 import time
+
 _seed = 4
 
 
@@ -61,3 +62,13 @@ def shuffle(seq: Sequence) -> object:
 
 def sample(population, k, *, counts=None):
     ...
+
+
+class Random:
+    def __init__(seed):
+        ...
+
+
+class SystemRandom:
+    def random(self):
+        return random()