TST: Add tests for empty dicts in eval scopes

Author: Alexander Lakeev

pandas/tests/computation/test_eval.py

@@ -44,6 +44,7 @@
 from pandas.core.computation.ops import (
     ARITH_OPS_SYMS,
     SPECIAL_CASE_ARITH_OPS_SYMS,
+    UndefinedVariableError,
     _binary_math_ops,
     _binary_ops_dict,
     _unary_math_ops,
@@ -1659,6 +1660,18 @@ def test_no_new_globals(self, engine, parser):
         gbls2 = globals().copy()
         assert gbls == gbls2
 
+    def test_empty_locals(self, engine, parser):
+        x = 1
+        msg = "name 'x' is not defined"
+        with pytest.raises(UndefinedVariableError, match=msg):
+            pd.eval("x + 1", engine=engine, parser=parser, local_dict={})
+
+    def test_empty_globals(self, engine, parser):
+        msg = "name '_var_s' is not defined"
+        e = "_var_s * 2"
+        with pytest.raises(UndefinedVariableError, match=msg):
+            pd.eval(e, engine=engine, parser=parser, global_dict={})
+
 
 @td.skip_if_no_ne
 def test_invalid_engine():