diff --git a/tests/test_defaults.py b/tests/test_defaults.py
index 68674440..eec67ef3 100644
--- a/tests/test_defaults.py
+++ b/tests/test_defaults.py
@@ -67,6 +67,7 @@ def global_test_2():
     assert global_test_2.cache_dpath() is not None
 
 
+@pytest.mark.mongo
 def test_mongetter_default_param():
 
     cachier.set_default_params(mongetter=_test_mongetter)
diff --git a/tests/test_general.py b/tests/test_general.py
index f1aa6888..f0d110ce 100644
--- a/tests/test_general.py
+++ b/tests/test_general.py
@@ -154,7 +154,8 @@ def _calls_wait_for_calc_timeout_slow(res_queue):
 @pytest.mark.parametrize(
     'mongetter,backend',
     [
-        (_test_mongetter, 'mongo'),
+        # (_test_mongetter, 'mongo'),  # Please do NOT test the mongo backend
+        # here.  It is tested in test_mongo_core.py
         (None, 'memory'),
         (None, 'pickle'),
     ]
@@ -182,7 +183,8 @@ def func(arg_1, arg_2):
 @pytest.mark.parametrize(
     'mongetter,backend',
     [
-        (_test_mongetter, 'mongo'),
+        # (_test_mongetter, 'mongo'),  # Please do NOT test the mongo backend
+        # here.  It is tested in test_mongo_core.py
         (None, 'memory'),
         (None, 'pickle'),
     ]
diff --git a/tests/test_mongo_core.py b/tests/test_mongo_core.py
index a6458355..2174d734 100644
--- a/tests/test_mongo_core.py
+++ b/tests/test_mongo_core.py
@@ -8,7 +8,7 @@
 import threading
 from datetime import timedelta
 from random import random
-from time import sleep
+from time import sleep, time
 from urllib.parse import quote_plus
 
 from birch import Birch  # type: ignore[import-not-found]
@@ -25,8 +25,6 @@
 
 
 # === Enables testing vs a real MongoDB instance ===
-CFG = Birch("cachier")
-
 
 class CfgKey():
     HOST = "TEST_HOST"
@@ -36,6 +34,14 @@ class CfgKey():
     TEST_VS_LIVE_MONGO = "TEST_VS_LIVE_MONGO"
 
 
+CFG = Birch(
+    namespace="cachier",
+    defaults={
+        CfgKey.TEST_VS_LIVE_MONGO: False,
+    },
+)
+
+
 URI_TEMPLATE = (
     "mongodb+srv://{uname}:{pwd}@{host}/{db}?retrywrites=true&w=majority")
 
@@ -114,6 +120,50 @@ def _test_mongo_caching(arg_1, arg_2):
     assert val6 == val5
 
 
+@pytest.mark.mongo
+def test_mongo_precache_value():
+
+    @cachier(backend='mongo', mongetter=_test_mongetter)
+    def func(arg_1, arg_2):
+        """Some function."""
+        return arg_1 + arg_2
+
+    result = func.precache_value(2, 2, value_to_cache=5)
+    assert result == 5
+    result = func(2, 2)
+    assert result == 5
+    func.clear_cache()
+    result = func(2, 2)
+    assert result == 4
+    result = func.precache_value(2, arg_2=2, value_to_cache=5)
+    assert result == 5
+    result = func(2, arg_2=2)
+    assert result == 5
+
+
+@pytest.mark.mongo
+def test_mongo_ignore_self_in_methods():
+
+    class TestClass():
+        @cachier(backend='mongo', mongetter=_test_mongetter)
+        def takes_2_seconds(self, arg_1, arg_2):
+            """Some function."""
+            sleep(2)
+            return arg_1 + arg_2
+
+    test_object_1 = TestClass()
+    test_object_2 = TestClass()
+    test_object_1.takes_2_seconds.clear_cache()
+    test_object_2.takes_2_seconds.clear_cache()
+    result_1 = test_object_1.takes_2_seconds(1, 2)
+    assert result_1 == 3
+    start = time()
+    result_2 = test_object_2.takes_2_seconds(1, 2)
+    end = time()
+    assert result_2 == 3
+    assert end - start < 1
+
+
 @pytest.mark.mongo
 def test_mongo_core_keywords():
     """Basic Mongo core functionality with keyword arguments."""