TST: Simplify tests entry-point

Author: kernc

backtesting/test/__main__.py

@@ -1,8 +1,7 @@
 import unittest
+import warnings
 
-suite = unittest.defaultTestLoader.discover('backtesting.test',
-                                            pattern='_test*.py')
-unittest.defaultTestLoader.suiteClass = lambda _: suite
 
 if __name__ == '__main__':
-    unittest.main(verbosity=2)
+    warnings.filterwarnings('error')
+    unittest.main(module='backtesting.test._test', verbosity=2)

backtesting/test/_test.py

@@ -3,7 +3,6 @@
 import sys
 import time
 import unittest
-import warnings
 from concurrent.futures.process import ProcessPoolExecutor
 from contextlib import contextmanager
 from glob import glob
@@ -1059,8 +1058,3 @@ def next(self):
                         order.cancel()
 
         Backtest(SHORT_DATA, S).run()
-
-
-if __name__ == '__main__':
-    warnings.filterwarnings('error')
-    unittest.main()