chore: import upstream snapshot with attribution

python/tests/core/ram/test_du.py

@@ -0,0 +1,79 @@
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+
+import pytest
+
+from mirage.accessor.ram import RAMAccessor
+from mirage.core.ram.du import du, du_all
+from mirage.resource.ram.store import RAMStore
+from mirage.types import PathSpec
+
+
+@pytest.fixture
+def store():
+    s = RAMStore()
+    s.dirs.add("/sub")
+    s.files["/a.txt"] = b"hello"
+    s.files["/sub/b.txt"] = b"world!"
+    s.files["/sub/c.txt"] = b"data"
+    return RAMAccessor(s)
+
+
+@pytest.mark.asyncio
+async def test_du_root(store):
+    total = await du(store,
+                     PathSpec(resource_path="", virtual="/", directory="/"))
+    assert total == 5 + 6 + 4
+
+
+@pytest.mark.asyncio
+async def test_du_subdir(store):
+    total = await du(
+        store, PathSpec(resource_path="sub", virtual="/sub", directory="/sub"))
+    assert total == 6 + 4
+
+
+@pytest.mark.asyncio
+async def test_du_single_file(store):
+    total = await du(
+        store,
+        PathSpec(resource_path="a.txt", virtual="/a.txt", directory="/a.txt"))
+    assert total == 5
+
+
+@pytest.mark.asyncio
+async def test_du_empty():
+    s = RAMStore()
+    a = RAMAccessor(s)
+    total = await du(a, PathSpec(resource_path="", virtual="/", directory="/"))
+    assert total == 0
+
+
+@pytest.mark.asyncio
+async def test_du_all_root(store):
+    entries, total = await du_all(
+        store, PathSpec(resource_path="", virtual="/", directory="/"))
+    assert total == 15
+    paths = [e[0] for e in entries]
+    assert "/a.txt" in paths
+    assert "/sub/b.txt" in paths
+    assert "/sub/c.txt" in paths
+
+
+@pytest.mark.asyncio
+async def test_du_all_subdir(store):
+    entries, total = await du_all(
+        store, PathSpec(resource_path="sub", virtual="/sub", directory="/sub"))
+    assert total == 10
+    assert len(entries) == 2