diff --git a/core/tests/routes/plugins/test_plugin_toggle.py b/core/tests/routes/plugins/test_plugin_toggle.py
index 73b62f25..13074517 100644
--- a/core/tests/routes/plugins/test_plugin_toggle.py
+++ b/core/tests/routes/plugins/test_plugin_toggle.py
@@ -30,8 +30,10 @@ def test_deactivate_plugin(client, just_installed_plugin):
             
     # tool has been taken away
     tools = get_embedded_tools(client)
+    assert len(tools) == 1
     tool_names = list(map(lambda t: t["metadata"]["name"], tools))
-    assert not "mock_tool" in tool_names
+    assert "mock_tool" not in tool_names
+    assert "get_the_time" in tool_names # from core_plugin
     
 
 def test_reactivate_plugin(client, just_installed_plugin):
@@ -55,5 +57,7 @@ def test_reactivate_plugin(client, just_installed_plugin):
 
     # tool has been re-embedded
     tools = get_embedded_tools(client)
+    assert len(tools) == 2
     tool_names = list(map(lambda t: t["metadata"]["name"], tools))
-    assert "mock_tool" in tool_names
\ No newline at end of file
+    assert "mock_tool" in tool_names
+    assert "get_the_time" in tool_names # from core_plugin
\ No newline at end of file
diff --git a/core/tests/routes/plugins/test_plugins_install_uninstall.py b/core/tests/routes/plugins/test_plugins_install_uninstall.py
index cd53b110..ca2d5874 100644
--- a/core/tests/routes/plugins/test_plugins_install_uninstall.py
+++ b/core/tests/routes/plugins/test_plugins_install_uninstall.py
@@ -26,10 +26,12 @@ def test_plugin_install_upload_zip(client, just_installed_plugin):
     # plugin has been actually extracted in (mock) plugins folder
     assert os.path.exists(mock_plugin_final_folder)
 
-    # check whether new tools have been embedded
+    # check whether new tool has been embedded
     tools = get_embedded_tools(client)
+    assert len(tools) == 2
     tool_names = list(map(lambda t: t["metadata"]["name"], tools))
     assert "mock_tool" in tool_names
+    assert "get_the_time" in tool_names # from core_plugin
     
 
 def test_plugin_uninstall(client, just_installed_plugin):
@@ -49,5 +51,7 @@ def test_plugin_uninstall(client, just_installed_plugin):
 
     # plugin tool disappeared
     tools = get_embedded_tools(client)
+    assert len(tools) == 1
     tool_names = list(map(lambda t: t["metadata"]["name"], tools))
     assert "mock_tool" not in tool_names
+    assert "get_the_time" in tool_names # from core_plugin