Added first version of DebugManager. Implemented draft of the rule engine

tests/core/test_ast_helper.py

@@ -0,0 +1,44 @@
+import ast
+
+import pytest
+from core.ast_helpers import UnreferencedNamesVisitor, UnreferencedVariablesVisitor
+
+from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+
+
+class TestAstHelper(TestUsingMemoryBasedSheerka):
+    @pytest.mark.parametrize("source, expected", [
+        ("a,b", {"a", "b"}),
+        ("isinstance(a, int)", {"isinstance", "a", "int"}),
+        ("date.today()", {"date"}),
+        ("test()", {"test"}),
+        ("sheerka.test()", {"sheerka"}),
+        ("for i in range(10): pass", set())
+
+    ])
+    def test_i_can_get_unreferenced_names_from_simple_expressions(self, source, expected):
+        context = self.get_context()
+
+        ast_ = ast.parse(source)
+        visitor = UnreferencedNamesVisitor(context)
+        visitor.visit(ast_)
+
+        assert visitor.names == expected
+
+    @pytest.mark.parametrize("source, expected", [
+        ("a,b", {"a", "b"}),
+        ("isinstance(a, int)", {"a", "int"}),
+        ("date.today()", set()),
+        ("test()", set()),
+        ("sheerka.test()", set()),
+        ("for i in range(10): pass", set())
+
+    ])
+    def test_i_can_get_unreferenced_variables_from_simple_expressions(self, source, expected):
+        context = self.get_context()
+
+        ast_ = ast.parse(source)
+        visitor = UnreferencedVariablesVisitor(context)
+        visitor.visit(ast_)
+
+        assert visitor.names == expected