Fix tests invocation on release CI worklow

.github/workflows/release.yml

@@ -118,8 +118,8 @@ jobs:
         # This is needed for now because cffi has no cp310 wheels
         CIBW_BEFORE_ALL_LINUX: "yum -y install libffi-devel"
         CIBW_TEST_EXTRAS: "test"
-        CIBW_TEST_COMMAND: "python {project}/tests/__init__.py"
-        CIBW_TEST_COMMAND_WINDOWS: "python {project}\\tests\\__init__.py"
+        CIBW_TEST_COMMAND: "python -m unittest discover -v {project}/tests"
+        CIBW_TEST_COMMAND_WINDOWS: "python -m unittest discover -v {project}\\tests"
         CIBW_TEST_SKIP: "*universal2:arm64"
 
     - uses: actions/upload-artifact@v3

Makefile

@@ -47,9 +47,9 @@ docs:
 
 
 test:
-	PYTHONASYNCIODEBUG=1 $(PYTHON) -m unittest -v tests.suite
-	$(PYTHON) -m unittest -v tests.suite
+	PYTHONASYNCIODEBUG=1 $(PYTHON) -m unittest discover -v tests
+	$(PYTHON) -m unittest discover -v tests
 
 
 testinstalled:
-	cd "$${HOME}" && $(PYTHON) $(ROOT)/tests/__init__.py
+	cd "$${HOME}" && $(PYTHON) -m unittest discover -v $(ROOT)/tests

tests/__init__.py

@@ -1,17 +0,0 @@
-import os.path
-import sys
-import unittest
-import unittest.runner
-
-
-def suite():
-    test_loader = unittest.TestLoader()
-    test_suite = test_loader.discover(
-        os.path.dirname(__file__), pattern='test_*.py')
-    return test_suite
-
-
-if __name__ == '__main__':
-    runner = unittest.runner.TextTestRunner()
-    result = runner.run(suite())
-    sys.exit(not result.wasSuccessful())

tests/__main__.py

@@ -0,0 +1,16 @@
+import os.path
+import sys
+import unittest
+import unittest.runner
+
+
+def suite():
+    test_loader = unittest.TestLoader()
+    test_suite = test_loader.discover(os.path.dirname(__file__))
+    return test_suite
+
+
+if __name__ == '__main__':
+    runner = unittest.runner.TextTestRunner()
+    result = runner.run(suite())
+    sys.exit(not result.wasSuccessful())

tests/test_libuv_api.py

@@ -13,7 +13,7 @@ def test_libuv_get_loop_t_ptr(self):
 
         pyximport.install()
 
-        from tests import cython_helper
+        import cython_helper
 
         self.assertTrue(cython_helper.capsule_equals(cap1, cap2))
         self.assertFalse(cython_helper.capsule_equals(cap1, cap3))