Ensure tests pass in any order.

setup.py

@@ -36,8 +36,9 @@
         "coverage[toml]",
         "freezegun>=0.2.8",
         "pretend",
-        "pytest>=3.3.0",
         "pytest-asyncio; python_version>='3.7'",
+        "pytest-randomly",
+        "pytest>=3.3.0",
         "python-rapidjson",
         "simplejson",
     ],

tests/test_stdlib.py

@@ -118,8 +118,9 @@ def test_find_caller(self, monkeypatch):
         assert log_record.filename == os.path.basename(__file__)
 
     def test_sets_correct_logger(self):
-        assert logging.getLoggerClass() is logging.Logger
-
+        """
+        Calling LoggerFactory ensures that Logger.findCaller gets patched.
+        """
         LoggerFactory()
 
         assert logging.getLoggerClass() is _FixedFindCallerLogger

tests/test_threadlocal.py

@@ -284,6 +284,7 @@ def test_bind_and_merge(self):
         Binding a variable causes it to be included in the result of
         merge_threadlocal.
         """
+        clear_threadlocal()
         bind_threadlocal(a=1)
 
         assert {"a": 1, "b": 2} == merge_threadlocal(None, None, {"b": 2})
@@ -303,13 +304,16 @@ def test_merge_works_without_bind(self):
         merge_threadlocal returns values as normal even when there has
         been no previous calls to bind_threadlocal.
         """
+        clear_threadlocal()
+
         assert {"b": 2} == merge_threadlocal(None, None, {"b": 2})
 
     def test_multiple_binds(self):
         """
         Multiple calls to bind_threadlocal accumulate values instead of
         replacing them.
         """
+        clear_threadlocal()
         bind_threadlocal(a=1, b=2)
         bind_threadlocal(c=3)
 
@@ -325,6 +329,7 @@ def test_unbind_threadlocal(self):
 
         clear_threadlocal()
         bind_threadlocal(a=234, b=34)
+
         assert {"a": 234, "b": 34} == merge_threadlocal_context(None, None, {})
 
         unbind_threadlocal("a")