Add tests/test_utils_eval.py

tests/test_utils_eval.py

@@ -0,0 +1,74 @@
+import pytest
+import sys
+import os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+from slic.utils.eval import *
+
+# Valid expressions
+@pytest.mark.parametrize("expr, expected", [
+    ("1 + 2", 3),
+    ("4 - 2", 2),
+    ("3 * 5", 15),
+    ("10 / 2", 5.0),
+    ("10 % 3", 1),
+    ("-5", -5),
+    ("+7", 7),
+    ("1 + 2 * 3", 7),
+    ("(1 + 2) * 3", 9),
+    ("-(-3)", 3),
+    ("-2 + 4 * 2", 6),
+    ("(4 + 5) * (6 - 1)", 45),
+    ("(((3)))", 3),
+    ("-(-(-2))", -2),
+    ("3 + +4", 7),
+    ("3 + -4", -1),
+])
+def test_arithmetic_eval_valid(expr, expected):
+    assert arithmetic_eval(expr) == expected
+
+# Expressions with unsupported operations or node types
+@pytest.mark.parametrize("expr", [
+    "2 ** 3",        # power operator not supported
+    "3 << 1",        # bitwise shift not supported
+    "1 < 2",         # comparison not supported
+    "abs(3)",        # function call not supported
+    "a + 2",         # undefined variable
+    "'a' + 'b'",     # string concatenation not supported
+    "'string'",      # string constant alone
+    "True + 1",      # booleans not explicitly supported
+    "[1, 2] + [3]",  # lists not supported
+    "{1: 2}",        # dicts not supported
+])
+def test_arithmetic_eval_raises(expr):
+    with pytest.raises(ArithmeticEvalError):
+        arithmetic_eval(expr)
+
+# Expressions that are syntactically valid but cause Python runtime errors
+@pytest.mark.parametrize("expr, exception", [
+    ("1 / 0", ZeroDivisionError),
+    ("10 % 0", ZeroDivisionError),
+    ("1e1000 * 1e1000", OverflowError),  
+])
+def test_arithmetic_eval_runtime_errors(expr, exception):
+    with pytest.raises(exception):
+        arithmetic_eval(expr)
+
+# forgiving_eval: returns original expression string on error
+@pytest.mark.parametrize("expr, expected", [
+    ("1 + 2", 3),
+    ("bad + 2", "bad + 2"),
+    ("1 / 0", "1 / 0"),
+    ("2 ** 10", "2 ** 10"),
+])
+def test_forgiving_eval(expr, expected):
+    assert forgiving_eval(expr) == expected
+
+# defaulting_eval: returns provided default value on error
+@pytest.mark.parametrize("expr, default, expected", [
+    ("3 * 4", 0, 12),
+    ("invalid + 1", 99, 99),
+    ("1 / 0", -1, -1),
+    ("2 ** 10", 42, 42),
+])
+def test_defaulting_eval(expr, default, expected):
+    assert defaulting_eval(expr, default=default) == expected