Including a version number update and check for len()

Author: cecily_carver

mysql_mimic/version.py

@@ -1,6 +1,6 @@
 """mysql-mimic version information"""
 
-__version__ = "2.6.3"
+__version__ = "2.6.4"
 
 
 def main(name: str) -> None:

tests/test_variables.py

@@ -34,6 +34,7 @@ def test_parse_timezone() -> None:
 def test_variable_mapping() -> None:
     test_vars = TestVars()
     assert test_vars
+    assert len(test_vars) == 1
 
     assert test_vars.get_variable("foo") == "bar"
     assert test_vars["foo"] == "bar"