1 files changed, 41 insertions, 0 deletions
diff --git a/grc/tests/test_expr_utils.py b/grc/tests/test_expr_utils.py
new file mode 100644
index 0000000000..4f25477bf1
--- /dev/null
+++ b/grc/tests/test_expr_utils.py
@@ -0,0 +1,41 @@
+import operator
+
+import pytest
+
+from grc.core.utils import expr_utils
+
+id_getter = operator.itemgetter(0)
+expr_getter = operator.itemgetter(1)
+
+
+def test_simple():
+    objects = [
+        ['c', '2 * a + b'],
+        ['a', '1'],
+        ['b', '2 * a + unknown * d'],
+        ['d', '5'],
+    ]
+
+    expected = [
+        ['a', '1'],
+        ['d', '5'],
+        ['b', '2 * a + unknown * d'],
+        ['c', '2 * a + b'],
+    ]
+
+    out = expr_utils.sort_objects2(objects, id_getter, expr_getter)
+
+    assert out == expected
+
+
+def test_other():
+    test = [
+        ['c', '2 * a + b'],
+        ['a', '1'],
+        ['b', '2 * c + unknown'],
+    ]
+
+    expr_utils.sort_objects2(test, id_getter, expr_getter, check_circular=False)
+
+    with pytest.raises(RuntimeError):
+        expr_utils.sort_objects2(test, id_getter, expr_getter)