add test

Author: matthiasdiener

test/test_debug.py

@@ -0,0 +1,49 @@
+__copyright__ = "Copyright (C) 2023 University of Illinois Board of Trustees"
+
+__license__ = """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+
+def test_get_object_cycles():
+    from pytools.debug import get_object_cycles
+    assert len(get_object_cycles([])) == 0
+
+    a = {}
+    assert len(get_object_cycles([a])) == 0
+
+    b = {"a": a}
+    assert len(get_object_cycles([b])) == 0
+    assert len(get_object_cycles([a, b])) == 0
+
+    a["b"] = b
+
+    assert len(get_object_cycles([a, b])) == 2
+    assert len(get_object_cycles([a, b])) == 2
+    assert len(get_object_cycles([a])) == 1
+
+    a = {}
+
+    assert len(get_object_cycles([a])) == 0
+
+    b = [42, 4]
+    a = [1, 2, 3, 4, 5, b]
+    b.append(a)
+
+    assert len(get_object_cycles([a, b])) == 2