file reorganization with top-level module

electrum/tests/__init__.py

@@ -0,0 +1,38 @@
+import unittest
+import threading
+
+from electrum import constants
+
+
+# Set this locally to make the test suite run faster.
+# If set, unit tests that would normally test functions with multiple implementations,
+# will only be run once, using the fastest implementation.
+# e.g. libsecp256k1 vs python-ecdsa. pycryptodomex vs pyaes.
+FAST_TESTS = False
+
+
+# some unit tests are modifying globals; sorry.
+class SequentialTestCase(unittest.TestCase):
+
+    test_lock = threading.Lock()
+
+    def setUp(self):
+        super().setUp()
+        self.test_lock.acquire()
+
+    def tearDown(self):
+        super().tearDown()
+        self.test_lock.release()
+
+
+class TestCaseForTestnet(SequentialTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        constants.set_testnet()
+
+    @classmethod
+    def tearDownClass(cls):
+        super().tearDownClass()
+        constants.set_mainnet()